Client-side
JSON Formatter Online: Format, Validate & Minify Instantly
Use this JSON formatter online to format, validate, and minify JSON instantly. Also converts XML to JSON and JSON to XML — all free, no server uploads.
Developer tools, guides,
and cheat sheets
Free browser-based tools, language guides, and quick-reference cheat sheets. Fast, distraction-free, and built for developers who ship.
Popular tools
View all tools → Client-side
Base64 Encoder/Decoder — Free Online Tool
Encode and decode Base64 strings instantly in your browser. Supports standard text and URL-safe Base64 formats — no data sent to servers.
Client-side
Regex Tester — Free Online Tool
Test regular expressions against text with real-time match highlighting. See all matches, groups, and an explanation of your pattern.
Client-side
JWT Decoder — Free Online Tool
Decode and inspect JWT tokens instantly in your browser. Parses header, payload, and shows expiry. No verification — client-side only.
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See all languages →Trending cheat sheets
All cheat sheets →Bash Commands Cheat Sheet: Essential Reference
Master the most useful bash commands with this quick-reference cheat sheet. Covers navigation, file ops, permissions, grep, process management, and scripting.
SQL Cheat Sheet: Queries, Joins, Aggregates
Master sql queries with this SQL cheatsheet: SELECT, WHERE, JOINs, GROUP BY, window functions, CTEs, and DML — with runnable copy-paste examples.
tmux Cheat Sheet: Sessions, Windows, Panes and Keys
tmux cheat sheet covering terminal multiplexing from scratch: sessions, windows, panes, shortcuts, copy mode, and configuration in one place.
CSS Border Cheat Sheet: Selectors and Properties
CSS border properties, selectors, the box model, colors, flexbox, and pseudo-classes covered in one quick-reference cheat sheet for web developers.
Markdown Cheat Sheet: Complete Reference for Developers
Markdown cheat sheet with horizontal rule markdown syntax, text formatting, links, tables, code blocks — your complete quick reference for writing docs.
Python String Methods: split, join, replace, strip & More
Python string methods cheatsheet: every built-in str method with syntax, working examples, and pitfalls — split, join, replace, strip, casefold, and more.
Git Commands Cheat Sheet
The complete git commands cheat sheet: setup, staging, branching, merging, remotes, stashing, history, undoing, and recovery — all in one place.
Linux Commands Cheat Sheet
Linux commands cheatsheet covering bash commands, file management, permissions, process control, networking, and terminal commands for developers.
Latest from the blog
All posts →React Table: Sorting, Filtering, and Infinite Scroll
React table components explained: build sortable, filterable data grids from scratch or with TanStack Table. Includes infinite scroll patterns and key gotchas.
React Multi Select: Dropdowns and Controlled Inputs
Build a react multi select input with controlled state and live filtering. Covers dropdowns, multi-select, and form integration for React components.
React Rich Text Editor: Top WYSIWYG Library Options
Learn which React rich text editor library fits your project: Tiptap, Lexical, Slate.js, and React-Quill compared with code examples and setup guidance.
Lists in React: Rendering Arrays with map() and Keys
Render lists in React with map() and the key prop. Covers dynamic arrays, nested lists, conditional rendering, and key-related bugs to avoid.
React Hook Form: Forms, Validation, and Error States
Learn react hook form for fast, minimal-re-render form validation in React. Covers useForm, register, handleSubmit, and real-world error handling.
React Router DOM Explained: Routes, Links, and Params
Learn react router dom routing from scratch. Set up BrowserRouter, define routes, pass URL params, and navigate your React SPA with confidence.