Free Developer Cheat Sheets
Downloadable PDF quick references for the most-used developer concepts. Print them, save them, share them — all free.
JSON Cheat Sheet
JSONJSON syntax, data types, validation rules, and common patterns. Includes examples for objects, arrays, and nesting.
Regex Quick Reference
Developer ToolsRegular expressions metacharacters, quantifiers, anchors, groups, and lookahead/lookbehind syntax with examples.
Base64 Encoding Reference
EncodingBase64 alphabet, padding rules, URL-safe variant, encoding/decoding examples in multiple languages.
UUID Standards Guide
Developer ToolsUUID versions 1-5, format breakdown, generation examples in Python/JavaScript/Go, and when to use each version.
HTTP Status Codes Reference
Developer ToolsComplete HTTP status codes reference: 1xx informational, 2xx success, 3xx redirection, 4xx client errors, 5xx server errors.
CSS Minification Best Practices
CSSCSS minification techniques, shorthand properties, selector optimization, and tools for reducing CSS file size.
JWT Structure and Claims Reference
SecurityJWT structure (header, payload, signature), standard claims, signing algorithms, and security best practices.
YAML Syntax Guide
Developer ToolsYAML syntax reference: scalars, collections, anchors, multi-line strings, and comparison with JSON equivalents.
Markdown Formatting Reference
Content ToolsMarkdown syntax reference for headings, emphasis, links, images, code blocks, tables, and extended features (GFM).
Color Code Reference
CSSColor code formats: HEX, RGB, HSL, RGBA, HSLA conversions, CSS color keywords, and web-safe palette reference.
Use the Free Online Tools Too
These cheat sheets pair perfectly with our free online developer tools. No install, no sign-up — process data directly in your browser.
Why Use Developer Cheat Sheets?
Developer cheat sheets give you instant access to syntax, rules, and examples without having to search through documentation every time. Whether you're working on a new language, debugging an API response, or writing a config file, a well-designed quick reference saves time and reduces errors.
Our PDF cheat sheets are designed to be printable and scannable — each fits on 1-2 pages so you can pin them to your desk or keep them open in a side window.
What's included in each PDF:
- ✓ Complete syntax reference tables
- ✓ Code examples you can copy directly
- ✓ Common errors and how to fix them
- ✓ Comparison tables (formats, versions, variants)
- ✓ Best practices and security notes
- ✓ Links to free online tools at toolpilot.dev