https://env.dev In-depth developer guides, cheatsheets, and references. Free tools and resources for developers. en-us Fri, 28 Aug 2026 10:48:37 GMT https://env.dev/cheatsheets/docker-compose-cheat-sheet Docker Compose commands, compose.yaml keys, depends_on health conditions, profiles, and develop.watch live reload — plus the gotchas that break stacks. Fri, 28 Aug 2026 00:00:00 GMT https://env.dev/cheatsheets/docker-compose-cheat-sheet https://env.dev/cheatsheets/sed-awk-cheat-sheet sed and awk one-liners for substitution, line ranges, field extraction, and aggregation — with the GNU vs BSD traps that break scripts on macOS. Fri, 28 Aug 2026 00:00:00 GMT https://env.dev/cheatsheets/sed-awk-cheat-sheet https://env.dev/cheatsheets/powershell-cheat-sheet PowerShell 7 cmdlets, the object pipeline, filtering, environment variables, and execution policy — plus what differs from Windows PowerShell 5.1. Fri, 28 Aug 2026 00:00:00 GMT https://env.dev/cheatsheets/powershell-cheat-sheet https://env.dev/guides/postgres-vector-database pgvector adds vector similarity search to Postgres: HNSW indexes, working SQL for RAG, benchmark numbers vs Pinecone, and when a dedicated store wins. Tue, 14 Jul 2026 00:00:00 GMT https://env.dev/guides/postgres-vector-database https://env.dev/guides/postgres-full-text-search tsvector and a GIN index cover most search needs without Elasticsearch. Working SQL, ranking, typo tolerance with pg_trgm, BM25 via ParadeDB, and limits. Tue, 14 Jul 2026 00:00:00 GMT https://env.dev/guides/postgres-full-text-search https://env.dev/guides/postgres-as-a-queue FOR UPDATE SKIP LOCKED turns a Postgres table into a job queue with transactional enqueue. Working SQL, LISTEN/NOTIFY, pgmq, and when you still need Kafka. Mon, 13 Jul 2026 00:00:00 GMT https://env.dev/guides/postgres-as-a-queue https://env.dev/guides/just-use-postgres PostgreSQL covers caching, queues, search, vectors, and documents through extensions. Why one database beats five systems — and where the limits are. Sat, 11 Jul 2026 00:00:00 GMT https://env.dev/guides/just-use-postgres https://env.dev/updates/gpt-5-6 GPT-5.6 ships as three tiers — Sol ($5/$30), Terra ($2.50/$15), Luna ($1/$6). Sol Ultra tops TerminalBench 2.1 at 91.9%, past Claude Mythos 5's 88.0%. Thu, 09 Jul 2026 00:00:00 GMT https://env.dev/updates/gpt-5-6 https://env.dev/guides/next-env-variables-undefined NEXT_PUBLIC_ vars undefined in the browser, server vars missing, or values frozen after deploy — every Next.js env variable failure mode and its fix. Mon, 29 Jun 2026 00:00:00 GMT https://env.dev/guides/next-env-variables-undefined https://env.dev/guides/vite-env-variables-undefined import.meta.env.VITE_X undefined? Usual causes: missing VITE_ prefix, process.env in the browser, stale dev server, dynamic key access, wrong .env path. Mon, 29 Jun 2026 00:00:00 GMT https://env.dev/guides/vite-env-variables-undefined https://env.dev/guides/react-env-variables-undefined React env variables return undefined unless prefixed REACT_APP_ (CRA) or VITE_ (Vite) and the dev server is restarted. Values inline at build time, not secret. Mon, 29 Jun 2026 00:00:00 GMT https://env.dev/guides/react-env-variables-undefined https://env.dev/guides/docker-env-variables-not-working Docker env variables not working usually comes down to ARG vs ENV scope, exec-form CMD skipping the shell, or .env only feeding Compose interpolation. Mon, 29 Jun 2026 00:00:00 GMT https://env.dev/guides/docker-env-variables-not-working https://env.dev/guides/securing-dev-environment-ai-agents Treat your AI coding agent as an untrusted intern: scope and expire API keys, lock down Docker egress, and assume prompt injection will exfiltrate secrets. Tue, 23 Jun 2026 00:00:00 GMT https://env.dev/guides/securing-dev-environment-ai-agents https://env.dev/guides/build-time-env-variables Build-time env vars are inlined into your bundle and frozen until you rebuild; runtime vars are read from process.env on each start. When to use each. Tue, 23 Jun 2026 00:00:00 GMT https://env.dev/guides/build-time-env-variables https://env.dev/guides/mcp-server-env-variables How MCP servers receive secrets through the env block, why stdio servers do not inherit your shell, and scoping tokens so prompt injection cannot drain them. Mon, 15 Jun 2026 00:00:00 GMT https://env.dev/guides/mcp-server-env-variables https://env.dev/guides/vite-env-variables Vite exposes only VITE_-prefixed vars on import.meta.env, statically replaced at build time. Covers .env modes, loadEnv, define, and undefined-var gotchas. Tue, 09 Jun 2026 00:00:00 GMT https://env.dev/guides/vite-env-variables https://env.dev/guides/bun-env-variables Bun auto-loads .env, .env.{NODE_ENV}, and .env.local with no dotenv install. Bun.env vs process.env, $VAR expansion, --env-file, and build inlining gotchas. Tue, 09 Jun 2026 00:00:00 GMT https://env.dev/guides/bun-env-variables https://env.dev/guides/laravel-env-variables env() returns null after php artisan config:cache — the #1 Laravel env trap. env() vs config(), APP_KEY rotation, .env precedence, and deployment caching. Tue, 09 Jun 2026 00:00:00 GMT https://env.dev/guides/laravel-env-variables https://env.dev/guides/django-env-variables Configure Django with os.environ and django-environ: DEBUG, SECRET_KEY, and DATABASE_URL in settings.py, .env files in dev, real env vars in production. Tue, 09 Jun 2026 00:00:00 GMT https://env.dev/guides/django-env-variables https://env.dev/guides/windows-environment-variables set is session-only, setx persists but truncates at 1,024 chars, PowerShell has $env: and [Environment]. User vs system scope, PATH pitfalls, GUI editor. Tue, 09 Jun 2026 00:00:00 GMT https://env.dev/guides/windows-environment-variables https://env.dev/updates/claude-fable-5 Claude Fable 5 tops SWE-Bench Pro at 80.3% and is the same model as Mythos 5 with safeguards on — not scaled down. Pricing, ranking, and access. Tue, 09 Jun 2026 00:00:00 GMT https://env.dev/updates/claude-fable-5 https://env.dev/guides/google-maps-api-key-gemini-billing A leaked Google Maps API key can now call paid Gemini APIs and run up huge bills. Lock keys down with API restrictions and budgets — and recover after abuse. Fri, 05 Jun 2026 00:00:00 GMT https://env.dev/guides/google-maps-api-key-gemini-billing https://env.dev/guides/node-no-warnings-not-recognized On Windows, NODE_NO_WARNINGS=1 node app.js fails: cmd parses the inline env var as a command. Fix with set, PowerShell $env:, cross-env, or --disable-warning. Tue, 26 May 2026 00:00:00 GMT https://env.dev/guides/node-no-warnings-not-recognized https://env.dev/guides/gemini-api-env-variables GEMINI_API_KEY and GOOGLE_API_KEY both auto-load in the google-genai SDK; GOOGLE_API_KEY wins if both set. Vertex AI needs project + location, not a key. Mon, 18 May 2026 00:00:00 GMT https://env.dev/guides/gemini-api-env-variables https://env.dev/updates/anthropic-agent-sdk-credits From June 15, 2026, Claude Agent SDK and `claude -p` stop drawing on subscription rate limits and start draining a separate monthly credit pool. Wed, 13 May 2026 00:00:00 GMT https://env.dev/updates/anthropic-agent-sdk-credits https://env.dev/guides/opentofu OpenTofu 1.11 is the Linux Foundation fork of Terraform 1.5 under MPL 2.0, with built-in state encryption, ephemeral values, and a drop-in tofu CLI. Mon, 11 May 2026 00:00:00 GMT https://env.dev/guides/opentofu https://env.dev/guides/pulumi-getting-started Pulumi 3.236 writes cloud infra in TypeScript, Python, Go, or C# under Apache 2.0. Compared with Terraform and OpenTofu, plus a first AWS S3 stack walkthrough. Thu, 07 May 2026 00:00:00 GMT https://env.dev/guides/pulumi-getting-started https://env.dev/guides/local-llms-for-coding Local LLMs for coding in 2026: Qwen2.5-Coder 32B at 73.7 Aider, Ollama vs llama.cpp vs LM Studio, and how to point Cursor or Continue at localhost. Mon, 04 May 2026 00:00:00 GMT https://env.dev/guides/local-llms-for-coding https://env.dev/comparisons/bun-vs-deno-vs-node Compare Bun 1.3, Deno 2.7, and Node.js 24 LTS. Benchmarks for cold start, throughput, and install speed; how each handles .env files; and when to pick which. Mon, 04 May 2026 00:00:00 GMT https://env.dev/comparisons/bun-vs-deno-vs-node https://env.dev/guides/ai-dark-factory AI dark factory: autonomous coding where agents write, test, and ship without human review. Coined by Dan Shapiro, Glowforge, January 2026. Fri, 01 May 2026 00:00:00 GMT https://env.dev/guides/ai-dark-factory https://env.dev/guides/jq jq is the C-based JSON processor (1.8.1, 2025) that filters, reshapes, and pipes JSON inside shell scripts. Recipes for kubectl, GitHub API, and AWS CLI. Thu, 30 Apr 2026 00:00:00 GMT https://env.dev/guides/jq https://env.dev/guides/tmux tmux is the BSD-licensed terminal multiplexer (3.6a, 2026) that survives SSH drops and reboots. Sessions, panes, .tmux.conf, scripting, and Neovim. Thu, 30 Apr 2026 00:00:00 GMT https://env.dev/guides/tmux https://env.dev/guides/rust-env-variables Read env vars in Rust with std::env::var, load .env files via dotenvy, and deserialize typed config with envy. Plus the Rust 2024 unsafe-set_var change. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/rust-env-variables https://env.dev/guides/java-env-variables Read env vars in Java with System.getenv() (immutable inside the JVM), bind to typed config via Spring Boot relaxed binding, plus dotenv-java for non-Spring. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/java-env-variables https://env.dev/guides/ruby-env-variables Read env vars in Ruby with ENV.fetch, load .env files with the dotenv gem (the original dotenv port), and choose dotenv-rails or Rails encrypted credentials. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/ruby-env-variables https://env.dev/guides/php-env-variables Three ways PHP reads env vars (getenv, $_ENV, $_SERVER). Plus vlucas/phpdotenv, Laravel's env() vs config(), and the FPM thread-safety gotcha. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/php-env-variables https://env.dev/guides/csharp-env-variables In C# / .NET, prefer IConfiguration over Environment.GetEnvironmentVariable, and map nested keys with double underscores (ConnectionStrings__Default). Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/csharp-env-variables https://env.dev/guides/env-vars-best-practices Manage env vars without leaking secrets: SCREAMING_SNAKE_CASE naming, .env in .gitignore from day one, startup validation, typed config objects, and rotation. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/env-vars-best-practices https://env.dev/guides/env-vars-tips Tactical env-var patterns: --mount=type=secret beats ARG, GitHub/GitLab/Jenkins idioms, ConfigMaps vs Secrets in Kubernetes, and build-time vs runtime split. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/env-vars-tips https://env.dev/guides/javascript-constants JS const blocks reassignment, not mutation. Real immutability needs Object.freeze (ES5) or TypeScript's as const assertion (TS 3.4, 2019) at zero runtime cost. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/javascript-constants https://env.dev/guides/python-constants Python has no const keyword. Constants follow SCREAMING_SNAKE_CASE per PEP 8, typing.Final adds mypy enforcement, and enum or MappingProxyType lock closed sets. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/python-constants https://env.dev/guides/go-constants Go const is compile-time only — no address, inlined at every use. Untyped constants adopt their use-site type; iota generates enum sequences and bitmasks. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/go-constants https://env.dev/guides/rust-constants Rust splits constants: const inlines at every use site; static has a fixed address. const fn runs at build time; LazyLock (1.80) gives thread-safe global state. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/rust-constants https://env.dev/guides/java-constants Java constants are static final fields. Compile-time inlining breaks consumers when library values change. List.of/Map.of/Set.of (Java 9+) are truly immutable. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/java-constants https://env.dev/guides/constants-best-practices Rules for good constants: SCREAMING_SNAKE_CASE with unit suffixes, real immutability per language, one source of truth, no magic numbers. Per Effective Java. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/constants-best-practices https://env.dev/guides/constants-tips Compile-time vs runtime constants, bundler tree-shaking and dead-code elimination, constant folding, TypeScript branded types, and derived config. Wed, 29 Apr 2026 00:00:00 GMT https://env.dev/guides/constants-tips https://env.dev/guides/docker-on-windows Docker on Windows runs four ways in 2026: Docker Desktop, Docker Engine in WSL2, Rancher Desktop, or Podman Desktop. Licensing, performance, and how to pick. Tue, 28 Apr 2026 00:00:00 GMT https://env.dev/guides/docker-on-windows https://env.dev/guides/how-to-build-an-mcp-server Build a Model Context Protocol server in TypeScript or Python in 2026: SDK quickstart, transports (stdio vs Streamable HTTP), security, and client setup. Fri, 24 Apr 2026 00:00:00 GMT https://env.dev/guides/how-to-build-an-mcp-server https://env.dev/guides/opengraph-image-not-showing Why your og:image is not rendering on Facebook, LinkedIn, Slack, or Discord — caching, absolute URLs, size limits, hotlink protection, and robots.txt blocks. Wed, 22 Apr 2026 00:00:00 GMT https://env.dev/guides/opengraph-image-not-showing https://env.dev/guides/opengraph-image-sizes Recommended OpenGraph image sizes per platform in 2026: universal safe size, aspect ratios, file size limits, and how each platform crops on mobile. Wed, 22 Apr 2026 00:00:00 GMT https://env.dev/guides/opengraph-image-sizes https://env.dev/guides/opengraph Open Graph meta tags in 2026: required fields, image sizes for Facebook/LinkedIn/X/Slack, Twitter Cards, dynamic OG images, debugging, and caching. Wed, 22 Apr 2026 00:00:00 GMT https://env.dev/guides/opengraph https://env.dev/cheatsheets/opengraph-cheat-sheet Every OpenGraph and Twitter Card tag with recommended image sizes per platform (Facebook, LinkedIn, X, Slack, Discord) and a copyable HTML template. Wed, 22 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/opengraph-cheat-sheet https://env.dev/guides/nextjs-env-variables How Next.js handles environment variables: .env file load order, NEXT_PUBLIC_ prefix, server vs client access, and common production errors. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/nextjs-env-variables https://env.dev/guides/github-actions-secrets-env When to use repository secrets, environment secrets, and configuration variables in GitHub Actions. Includes workflow examples for Node.js, Python, and Docker. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/github-actions-secrets-env https://env.dev/guides/nodejs-env-variables How to use environment variables in Node.js: process.env, dotenv, the Node 20.6+ --env-file flag, NODE_ENV, type-safe validation with zod. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/nodejs-env-variables https://env.dev/guides/env-vars-security Why environment variables are not truly secure and what to do about it: secret rotation, leak detection, client-side risk, and secrets managers. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/env-vars-security https://env.dev/guides/go-env-variables How to read, set, and manage environment variables in Go. Covers os.Getenv, os.LookupEnv, godotenv, Viper, envconfig, build-time variables, and testing. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/go-env-variables https://env.dev/guides/jwt-best-practices Security best practices for JSON Web Tokens: algorithm selection, storage, expiration, refresh patterns, revocation, and common vulnerabilities. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/jwt-best-practices https://env.dev/guides/docker-env-variables How to use environment variables in Docker: ENV vs ARG in Dockerfile, docker run -e, --env-file, multi-stage builds, BuildKit secrets, and best practices. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/docker-env-variables https://env.dev/guides/vercel-env-variables How to configure environment variables on Vercel: the dashboard, CLI (vercel env pull), system variables, per-env settings, and Edge function access. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/vercel-env-variables https://env.dev/guides/env-file-syntax .env files have no formal spec, so quoting, inline comments, and multiline values parse differently in Node.js, Python, Ruby, Go, and Docker Compose. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/env-file-syntax https://env.dev/guides/kubernetes-env-variables How to configure environment variables in Kubernetes: inline env, ConfigMaps, Secrets, the downward API, and best practices for managing configuration at scale. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/kubernetes-env-variables https://env.dev/guides/aws-lambda-env-variables How to set and manage environment variables in AWS Lambda: the console, CLI, SAM, CDK, Terraform, KMS encryption, and Secrets Manager. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/aws-lambda-env-variables https://env.dev/guides/python-env-variables How to read, set, and manage environment variables in Python. Covers os.environ, python-dotenv, Pydantic Settings v2, and Django/Flask configuration patterns. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/python-env-variables https://env.dev/guides/sharing-env-files-securely Share .env files securely with send.env.dev — end-to-end encrypted, burn-on-first-read links, EU-hosted, zero dependencies. Plus 1Password, Doppler, Vault. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/sharing-env-files-securely https://env.dev/guides/terraform-variables The three ways to set Terraform variables: variable blocks, .tfvars files, TF_VAR_ env vars, precedence, sensitive values, and validation. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/terraform-variables https://env.dev/guides/dotenv-not-loading Fix environment variables not loading from .env files. Covers Node.js, Python, Docker, file path issues, syntax errors, load order, and production gotchas. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/dotenv-not-loading https://env.dev/guides/typescript-generics Master TypeScript generics with practical examples — type parameters, constraints, utility types (Partial, Pick, Omit), mapped and conditional types. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/typescript-generics https://env.dev/guides/rest-api-best-practices REST API design conventions used by Stripe, GitHub, and Google: URI naming, versioning, cursor pagination, error envelopes, status codes, auth, and HATEOAS. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/rest-api-best-practices https://env.dev/guides/ssh-keys-guide Generate Ed25519 SSH keys, configure ssh-agent and ~/.ssh/config, set up tunnels and ProxyJump, and harden sshd_config for production servers. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/ssh-keys-guide https://env.dev/guides/docker-networking Docker networking deep dive: bridge, host, overlay, macvlan drivers, port mapping, embedded DNS at 127.0.0.11, Compose isolated networks, and debugging. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/docker-networking https://env.dev/guides/linux-file-permissions Linux file permissions reference: chmod octal/symbolic, chown, umask, SUID/SGID/sticky bits, POSIX ACLs (setfacl/getfacl), and Linux capabilities. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/linux-file-permissions https://env.dev/guides/nginx-configuration Production Nginx config: server blocks, reverse proxy, SSL/TLS termination with Let's Encrypt, upstream load balancing, proxy caching, and rate limiting. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/nginx-configuration https://env.dev/guides/git-branching-strategies Compare Git branching strategies: GitFlow, trunk-based development, GitHub Flow, and release branches. Choose the right workflow for your team. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/git-branching-strategies https://env.dev/guides/python-virtual-environments Manage Python environments with venv, pip, pyenv, Poetry, and conda. Learn requirements.txt, pyproject.toml, and environment best practices. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/python-virtual-environments https://env.dev/guides/https-tls-explained Understand HTTPS, TLS certificates, the TLS handshake, cipher suites, Let's Encrypt, and HSTS for secure web communication. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/https-tls-explained https://env.dev/guides/dns-explained Understand DNS record types, resolution process, caching, TTL values, and how to debug common DNS misconfigurations. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/dns-explained https://env.dev/guides/regex-patterns-cookbook A cookbook of common regex patterns for email, URL, IP address, phone number, and date validation with detailed explanations. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/regex-patterns-cookbook https://env.dev/guides/rate-limiting-strategies Implement rate limiting with token bucket, sliding window, fixed window, and Redis-based strategies. Code examples, edge patterns, and API gateways. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/guides/rate-limiting-strategies https://env.dev/cheatsheets/http-status-codes-cheat-sheet Every HTTP status code explained with practical examples. 1xx through 5xx with when to use each code in your API. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/http-status-codes-cheat-sheet https://env.dev/cheatsheets/cidr-cheat-sheet Complete CIDR reference table: every prefix from /8 to /32 with subnet mask, total addresses, usable hosts, and common use cases. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/cidr-cheat-sheet https://env.dev/cheatsheets/yaml-cheat-sheet Quick reference for YAML syntax: strings, numbers, multiline values, sequences, mappings, anchors, aliases, and common gotchas like the Norway problem. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/yaml-cheat-sheet https://env.dev/cheatsheets/json-cheat-sheet Quick reference for JSON syntax: data types, objects, arrays, JSON.parse/stringify, jq basics, and common mistakes like trailing commas and single quotes. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/json-cheat-sheet https://env.dev/cheatsheets/cron-examples-cheat-sheet Ready-to-use cron expressions for every common schedule: every 5 minutes, hourly, daily, weekly, monthly, and more. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/cron-examples-cheat-sheet https://env.dev/cheatsheets/python-cheat-sheet Python quick reference: data types, string methods, list/dict comprehensions, f-strings, file I/O, and common standard library modules. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/python-cheat-sheet https://env.dev/cheatsheets/javascript-cheat-sheet JavaScript ES6+ quick reference: destructuring, spread operator, arrow functions, array methods, promises, async/await, and modules. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/javascript-cheat-sheet https://env.dev/cheatsheets/typescript-cheat-sheet TypeScript quick reference: basic types, interfaces, generics, utility types, type guards, enums, and type assertions. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/typescript-cheat-sheet https://env.dev/cheatsheets/sql-cheat-sheet SQL quick reference: SELECT, JOINs, GROUP BY, subqueries, window functions, indexes, and data manipulation commands. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/sql-cheat-sheet https://env.dev/cheatsheets/go-cheat-sheet Go quick reference: types, structs, interfaces, goroutines, channels, error handling, slices, maps, and defer/panic/recover. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/go-cheat-sheet https://env.dev/cheatsheets/rust-cheat-sheet Rust quick reference: ownership, borrowing, lifetimes, traits, enums, pattern matching, Result/Option, and common macros. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/rust-cheat-sheet https://env.dev/cheatsheets/css-cheat-sheet CSS quick reference: Flexbox, Grid, selectors, units, CSS variables, media queries, and transitions. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/css-cheat-sheet https://env.dev/cheatsheets/linux-cheat-sheet Linux commands quick reference: file management, process control, networking, permissions, systemd, and disk usage. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/linux-cheat-sheet https://env.dev/cheatsheets/aws-cli-cheat-sheet AWS CLI quick reference: EC2, S3, IAM, Lambda, and CloudFormation commands with copy-paste examples, named profiles, and JMESPath --query filtering. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/aws-cli-cheat-sheet https://env.dev/cheatsheets/markdown-cheat-sheet Markdown syntax quick reference: headings, links, images, lists, code blocks, tables, and GitHub Flavored Markdown extensions. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/markdown-cheat-sheet https://env.dev/cheatsheets/vim-cheat-sheet Vim quick reference: modes, navigation, editing, search/replace, visual mode, registers, macros, and window management. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/vim-cheat-sheet https://env.dev/cheatsheets/mysql-cheat-sheet MySQL quick reference: data types, CRUD operations, JOINs, indexes, user management, backup/restore, and common functions. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/cheatsheets/mysql-cheat-sheet https://env.dev/comparisons/rest-vs-graphql Compare REST and GraphQL APIs side by side. The trade-offs in performance, flexibility, caching, and developer experience, and how to choose. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/rest-vs-graphql https://env.dev/comparisons/docker-vs-kubernetes Understand the difference between Docker and Kubernetes. Docker builds and runs containers; Kubernetes orchestrates them at scale. Learn when to use each. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/docker-vs-kubernetes https://env.dev/comparisons/npm-vs-yarn-vs-pnpm Compare npm, yarn, and pnpm package managers. Benchmark install speed, disk usage, lockfile format, and monorepo support to pick the best one for your project. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/npm-vs-yarn-vs-pnpm https://env.dev/comparisons/postgresql-vs-mysql Compare PostgreSQL and MySQL databases. Analyze performance, features, JSON support, replication, and ecosystem to choose the right database for your project. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/postgresql-vs-mysql https://env.dev/comparisons/redis-vs-memcached Compare Redis and Memcached for caching. Evaluate data structures, persistence, clustering, and use cases to pick the right in-memory store. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/redis-vs-memcached https://env.dev/comparisons/nginx-vs-apache Compare Nginx and Apache web servers. Evaluate performance, configuration, modules, reverse proxy capabilities, and resource usage. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/nginx-vs-apache https://env.dev/comparisons/sql-vs-nosql Compare SQL and NoSQL databases. Understand relational vs document/key-value/graph models, consistency guarantees, scalability, and when to use each. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/sql-vs-nosql https://env.dev/comparisons/typescript-vs-javascript Compare TypeScript and JavaScript. Evaluate type safety, developer experience, build tooling, ecosystem support, and migration strategies. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/typescript-vs-javascript https://env.dev/comparisons/git-merge-vs-rebase Compare git merge and git rebase strategies. Understand how each affects commit history, when to use which, and best practices for team workflows. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/git-merge-vs-rebase https://env.dev/comparisons/vite-vs-webpack Compare Vite and Webpack build tools. Evaluate dev server speed, build performance, configuration complexity, plugin ecosystems, and migration paths. Sun, 12 Apr 2026 00:00:00 GMT https://env.dev/comparisons/vite-vs-webpack https://env.dev/guides/neovim-lua Pass env vars to vim.fn.jobstart, learn the vim.* namespace (vim.fn, vim.api, vim.opt), and build a clean init.lua with autocommands and vim.uv async I/O. Thu, 02 Apr 2026 00:00:00 GMT https://env.dev/guides/neovim-lua https://env.dev/guides/graphql-guide Learn GraphQL from scratch: SDL schema design, queries, mutations, subscriptions, resolvers, the N+1 problem with DataLoader, pagination, and security. Mon, 23 Mar 2026 00:00:00 GMT https://env.dev/guides/graphql-guide https://env.dev/guides/websockets-guide WebSockets end to end: the RFC 6455 protocol, handshake, browser API, server code in Node.js, Python, and Go, reconnection, heartbeats, and scaling. Thu, 19 Mar 2026 00:00:00 GMT https://env.dev/guides/websockets-guide https://env.dev/guides/server-sent-events Server-Sent Events (SSE): wire format, EventSource API, a Node.js TypeScript implementation, auto-reconnection, HTTP/2 multiplexing, and SSE vs WebSockets. Thu, 19 Mar 2026 00:00:00 GMT https://env.dev/guides/server-sent-events https://env.dev/cheatsheets/nginx-cheat-sheet Quick reference for Nginx: service management, server blocks, reverse proxy, load balancing, SSL/TLS, location matching, logging, and performance tuning. Thu, 19 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/nginx-cheat-sheet https://env.dev/cheatsheets/tmux-cheat-sheet Quick reference for tmux: sessions, windows, panes, copy mode, resizing, synchronize panes, configuration, and keybindings. Thu, 19 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/tmux-cheat-sheet https://env.dev/cheatsheets/bash-scripting-cheat-sheet Quick reference for Bash scripting: variables, parameter expansion, conditionals, loops, functions, arrays, redirection, error handling, and strict mode. Thu, 19 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/bash-scripting-cheat-sheet https://env.dev/cheatsheets/curl-cheat-sheet Quick reference for curl: GET/POST requests, headers, cookies, authentication, file uploads and downloads, debugging, TLS, proxies, and scripting patterns. Thu, 19 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/curl-cheat-sheet https://env.dev/cheatsheets/jq-cheat-sheet jq commands for filtering, transforming, and merging JSON: filters, pipes, select, map/reduce, path expressions, output formatting, plus jq 1.8 changes. Tue, 17 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/jq-cheat-sheet https://env.dev/guides/dark-factory-pattern-part-5 Secure an AI dark factory with harness engineering: defense in depth, OS sandboxing, secrets, supply-chain lockdown, audit trails, and the OWASP Agentic Top 10. Mon, 16 Mar 2026 00:00:00 GMT https://env.dev/guides/dark-factory-pattern-part-5 https://env.dev/guides/github-actions-guide GitHub Actions CI/CD: workflow syntax, triggers, matrix builds, reusable workflows, composite actions, caching, secrets, and security hardening. Sat, 14 Mar 2026 00:00:00 GMT https://env.dev/guides/github-actions-guide https://env.dev/cheatsheets/github-actions-cheat-sheet Quick reference for GitHub Actions CI/CD: workflow syntax, triggers, jobs, matrix strategies, secrets, caching, artifacts, and reusable workflows. Sat, 14 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/github-actions-cheat-sheet https://env.dev/guides/git-getting-started Learn Git from scratch: cloning, branching, committing, pushing, pull requests, and resolving conflicts, with VS Code and GitHub Desktop walkthroughs. Fri, 13 Mar 2026 00:00:00 GMT https://env.dev/guides/git-getting-started https://env.dev/guides/postgresql-vs-mongodb PostgreSQL vs MongoDB compared head-to-head: when to choose which, why Postgres wins for 95% of projects, JSONB vs documents, and free hosting tiers. Thu, 12 Mar 2026 00:00:00 GMT https://env.dev/guides/postgresql-vs-mongodb https://env.dev/guides/cors-guide CORS in depth: headers, preflight and credentialed requests, debugging, third-party scripts (Google Ads, Cloudflare, PostHog), and framework setup. Thu, 12 Mar 2026 00:00:00 GMT https://env.dev/guides/cors-guide https://env.dev/cheatsheets/postgresql-cheat-sheet PostgreSQL reference: CRUD, JOINs with visual diagrams, subquery vs JOIN vs CTE, window functions, indexing, JSONB, transactions, and performance tuning. Thu, 12 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/postgresql-cheat-sheet https://env.dev/guides/dark-factory-pattern-part-4 Scale your AI dark factory: git worktrees, Agent Teams, model routing, prompt caching, budget gates, observability, and agentic coding economics that work. Wed, 11 Mar 2026 00:00:00 GMT https://env.dev/guides/dark-factory-pattern-part-4 https://env.dev/cheatsheets/terraform-cheat-sheet Quick reference for Terraform CLI commands, HCL configuration syntax, state management, workspaces, expressions, and built-in functions. Wed, 11 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/terraform-cheat-sheet https://env.dev/cheatsheets/kubernetes-cheat-sheet Quick reference for kubectl: contexts, core resources, pod operations, deployments, scaling, debugging, ConfigMaps, and Secrets. Tue, 10 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/kubernetes-cheat-sheet https://env.dev/guides/dark-factory-pattern-part-3 Spec-driven agentic coding for an AI dark factory: write precise specs, run holdout scenarios as quality gates, build an eval pipeline, and auto-merge safely. Mon, 09 Mar 2026 00:00:00 GMT https://env.dev/guides/dark-factory-pattern-part-3 https://env.dev/cheatsheets/ssh-cheat-sheet Quick reference for SSH: connecting, key generation, agent, port forwarding, jump hosts, SCP, SFTP, config file, and permissions. Mon, 09 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/ssh-cheat-sheet https://env.dev/guides/dev-containers Dev Containers from devcontainer.json to Features, lifecycle scripts, Docker Compose, the CLI, performance tuning, security, and the gotchas. Sun, 08 Mar 2026 00:00:00 GMT https://env.dev/guides/dev-containers https://env.dev/guides/dark-factory-pattern-part-2 Set up your AI dark factory agent: install Claude Code, write a production-grade AGENTS.md, decompose agentic coding tasks, and build feedback loops that learn. Sat, 07 Mar 2026 00:00:00 GMT https://env.dev/guides/dark-factory-pattern-part-2 https://env.dev/guides/dark-factory-pattern Six-level AI dark factory playbook from manual coding (Level 0) to fully autonomous code (Level 5). Concrete agentic-coding actions, real numbers, no hype. Thu, 05 Mar 2026 00:00:00 GMT https://env.dev/guides/dark-factory-pattern https://env.dev/guides/neovim Master Neovim: modes, motions, text objects, registers, built-in LSP, Tree-sitter, Lua configuration, lazy.nvim plugins, and macros. Thu, 05 Mar 2026 00:00:00 GMT https://env.dev/guides/neovim https://env.dev/cheatsheets/neovim-cheat-sheet Essential Neovim commands and keybindings: modes, navigation, editing, text objects, search, windows, buffers, macros, and more. Thu, 05 Mar 2026 00:00:00 GMT https://env.dev/cheatsheets/neovim-cheat-sheet https://env.dev/guides/docker-compose-env-variables Use environment variables in Docker Compose: .env auto-load, env_file, --env-file, multi-environment patterns, substitution, and secrets. Sat, 28 Feb 2026 00:00:00 GMT https://env.dev/guides/docker-compose-env-variables https://env.dev/guides/dotenv Everything about .env files: syntax rules, parser quirks, language examples (Node, Python, Go, Docker), best practices, and the gotchas that bite. Fri, 27 Feb 2026 00:00:00 GMT https://env.dev/guides/dotenv https://env.dev/guides/cron-expression-guide Cron expression syntax explained: 5- and 6-field formats, special characters (* , - / L W #), common schedules, and platform-specific differences. Thu, 26 Feb 2026 00:00:00 GMT https://env.dev/guides/cron-expression-guide https://env.dev/guides/unix-timestamps-explained What Unix epoch time is, why it is used, how the Y2K38 problem threatens 32-bit systems, and how to generate and convert timestamps across languages. Thu, 26 Feb 2026 00:00:00 GMT https://env.dev/guides/unix-timestamps-explained https://env.dev/guides/base64-encoding-explained Understand Base64 encoding end-to-end: how the algorithm maps bytes to 64 characters, when to use it, what padding means, and why it inflates size by 33%. Thu, 26 Feb 2026 00:00:00 GMT https://env.dev/guides/base64-encoding-explained https://env.dev/guides/what-is-jwt Learn how JSON Web Tokens work — header, payload, and signature structure, typical auth use cases, common pitfalls, and best practices for secure usage. Thu, 26 Feb 2026 00:00:00 GMT https://env.dev/guides/what-is-jwt https://env.dev/cheatsheets/regex-cheat-sheet Quick reference for regular expressions: character classes, quantifiers, anchors, lookaheads, and capture groups — with copy-paste examples for common matches. Thu, 26 Feb 2026 00:00:00 GMT https://env.dev/cheatsheets/regex-cheat-sheet https://env.dev/cheatsheets/git-cheat-sheet Essential Git commands: how to undo the last commit, resolve merge conflicts, rebase branches, squash commits, and one-liners you always forget. Thu, 26 Feb 2026 00:00:00 GMT https://env.dev/cheatsheets/git-cheat-sheet https://env.dev/cheatsheets/docker-cheat-sheet Docker CLI quick reference — the commands you actually use: run, exec, build, compose up/down, volumes, networks, prune, images, and common debugging flags. Thu, 26 Feb 2026 00:00:00 GMT https://env.dev/cheatsheets/docker-cheat-sheet