Free browser-based tools, language guides, and quick-reference cheat sheets. Fast, distraction-free, and built for developers who ship.
Use this json formatter online to format, validate, and minify JSON instantly in your browser. No data sent to servers — validate JSON online with syntax error detection and instant feedback.
Encode and decode Base64 strings instantly in your browser. Supports standard text and URL-safe Base64 formats — no data sent to servers.
Test regular expressions against text with real-time match highlighting. See all matches, groups, and an explanation of your pattern.
Decode and inspect JWT tokens instantly in your browser. Parses header, payload, and shows expiry. No verification — client-side only.
Master CSS Flexbox with this cheat sheet covering flex container and flex item properties, alignment, ordering, and responsive layout patterns with examples.
A complete Docker commands cheat sheet covering containers, images, volumes, networks, and Docker Compose — quick reference for containerized development.
A comprehensive Linux commands cheat sheet covering file management, permissions, process control, networking, and shell scripting essentials for developers.
A complete regex cheat sheet covering pattern syntax, quantifiers, anchors, groups, lookaheads, and flags — the universal reference for regular expressions.
A complete Git commands cheat sheet covering init, clone, branch, merge, rebase, stash, and more. Quick reference for beginners and pros.
Complete JavaScript array methods reference with ES6+ syntax. All methods, parameters, and return values in one place.
Python string methods reference: every built-in method with syntax and examples. Split, join, replace, strip, format, and more — organized by task.
Master php json decode: choose arrays or objects, handle the null ambiguity, avoid big-integer precision loss, and build a reliable decode function.
Learn what typescript tuples are, how they differ from arrays, and how to use labeled, optional, and readonly tuples with real examples and common pitfalls.
Learn what is cross join in SQL, how it generates a Cartesian product, when to use it, and see practical examples in MySQL, PostgreSQL, and more.
Golang goroutines make concurrent programming easy. Learn goroutine syntax, WaitGroups, channels, and goroutine pools with runnable Go code examples.
Master java string formatting with String.format, printf, and formatted(). Format specifiers, padding, numbers, dates, and the traps to avoid.
Learn how to write a java lambda function with clear syntax explanations, step-by-step examples, and common pitfalls from Java 8 to modern versions.