Developer Cheat Sheets
Fast, clean, printable syntax references for JSON Schema, SQL query conventions, and regular expressions. 100% free, no email or signup required.
JSON Schema Cheat Sheet
A quick printable reference guide for JSON Schema types, validation rules, object & array constraints, and schema composition keywords.
SQL Style Guide & Formatting Rules
Industry best practices for writing clean SQL queries: keyword casing, indentation standards, table aliases, and JOIN structures.
Regular Expressions Cheat Sheet
Quick syntax reference for RegExp matching, quantifiers, anchors, lookahead/lookbehind assertions, and standard validation snippets.
HTTP Status Codes & Headers Reference
A quick reference guide for HTTP response codes, REST API conventions, and essential HTTP request/response headers.
Git Commands & Workflow Reference
A fast reference guide for daily Git commands: branch management, interactive rebasing, stashing, and safe commit recovery.
Cron Syntax & Schedule Reference
A complete cheat sheet for cron time fields, special characters (*, /, -, ,), and common schedule expressions.
Docker CLI & Docker Compose Cheat Sheet
A quick reference guide for everyday Docker commands, multi-stage Dockerfile patterns, container debugging, and Docker Compose workflows.
Linux File Permissions & Chmod Guide
A complete guide to understanding Linux permissions: user/group/other breakdown, octal number math (755, 644, 400), and permission fixing recipes.
Bash Scripting & CLI One-Liners Cheat Sheet
A fast reference guide for writing clean Bash shell scripts: parameter expansion, exit code handling, loops, string operations, and pipes.
Kubernetes kubectl CLI Cheat Sheet
A complete reference for Kubernetes administrators and developers: pod logs, exec debugging, port forwarding, rollout status, and context switching.
CSS Grid & Flexbox Reference Guide
A fast cheat sheet for CSS Flexbox and CSS Grid layout properties, axis alignments, responsive auto-fit patterns, and shorthand properties.
PostgreSQL Performance & Indexing Cheat Sheet
A practical performance tuning guide for PostgreSQL database engineers: query plan analysis, index types, connection pooling, and configuration tuning.
JWT Claims Cheat Sheet
Quick reference for JWT registered claims (iss, sub, aud, exp, nbf, iat, jti), common public claims, and safe private claim patterns.
HTTP Security Headers Cheat Sheet
Printable reference for the response headers that harden browsers against clickjacking, XSS, MIME confusion, and insecure transport.
JSONPath & jq Cheat Sheet
Side-by-side JSONPath and jq patterns for selecting fields, filtering arrays, and recursive descent — for API debugging and payload surgery.