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Featured references
Featured guides, hand-picked by our editors.
SQL Queries Cheatsheet: SELECT, JOINs & Indexing
Practical SQL cheatsheet covering SELECT, WHERE, JOINs, GROUP BY, window functions, indexing, and query optimization with examples.
Read guide →JavaScriptRegex Patterns Cheatsheet: 25 Copy-Paste Examples
Battle-tested regex cheatsheet with 25 copy-paste patterns for email, URLs, dates, plus flags, groups, and catastrophic backtracking fixes.
Read guide →APIsHTTP Status Codes Cheatsheet: What to Return & When
Developer HTTP status code reference: 2xx, 3xx, 4xx, 5xx meanings, when to return each code, and REST API error-handling best practices.
Read guide →Honest tool comparisons
Tested criteria, comparison tables, no sponsored rankings.
Free JSON Utilities: Formatters, Validators & Converters
Compare 7 free JSON formatters, validators, and converters — features, privacy, and best picks for developers handling APIs daily.
Free / Open SourceOpen Source Markdown Editors: 7 Picks for Docs & Blogs
7 best open source Markdown editors for developers — desktop, web, and self-hosted options with live preview, MDX, and sync compared.
Free / FreemiumAPI Testing Clients: Postman vs Hoppscotch & 5 More
Honest API testing client comparison: Postman, Hoppscotch, Insomnia, Thunder Client, Bruno, and curl, with auth, environments, and CI tips.
Free / Open SourceSVG Icon Editors: 6 Free Tools Compared for Developers
Compare 6 free SVG icon editors and libraries — Figma, Boxy SVG, Lucide, Heroicons, SVGOMG, Iconify — with optimization and icon workflow tips.
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