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JSON, regex, encoding, hashes, and everything else a developer reaches for daily.
47 tools
Beautify, minify, and validate JSON data instantly.
Encode and decode Base64 strings instantly.
Generate v4 UUIDs instantly, single or in bulk.
Explain any code in plain language — all languages supported.
Percent-encode or decode URL strings instantly.
Encode/decode HTML entities like < > &.
Convert Unix epoch timestamps to/from readable dates.
Test regex patterns with live match highlighting.
Decode JWT tokens and inspect header, payload, and expiry.
Visually build cron expressions with human-readable output.
Toggle Unix file permissions and convert between numeric and symbolic notation.
Generate Apache and Nginx redirect rules from old/new URL pairs.
Look up any HTTP status code with description and use cases.
Format and beautify SQL queries with proper indentation and keyword casing.
Convert text into SEO-friendly URL slugs instantly.
Generate realistic fake test data in JSON, CSV, or SQL format.
Format and beautify or minify JavaScript code instantly.
Generate a complete PWA manifest.json for installable web apps.
Format and validate XML with instant error detection.
Convert cURL commands to JavaScript, Python, and PHP code.
Send HTTP requests with custom headers, body, and auth — like Postman, in your browser.
Parse any URL into components, edit query params, and rebuild it live — all in your browser.
Live HTML, CSS & JS editor with instant preview
Generate JSON Schema (Draft-07) from any JSON object automatically.
Convert HTML to valid React JSX — handles className, style objects, events and more.
Load and compare multiple URLs side by side in resizable iframes.
Escape or unescape strings for JSON embedding.
Stringify JSON objects or parse JSON strings.
Generate random dates within a custom date range.
Generate random IPv4 and IPv6 addresses for testing.
Generate random JSON objects for testing and mocking.
Build a .gitignore from popular language and tool templates.
Generate ASCII directory trees from indented text.
Compare and generate OSS LICENSE files (MIT, Apache 2, GPL, etc.).
Pretty-print or minify GraphQL queries and SDL.
Validate package.json + see dependency stats.
Validate .env files: format, duplicates, secret detection.
Live editor for Mermaid flowcharts, sequence, class, gantt diagrams. Export SVG/PNG.
Run real Python 3 (with numpy/pandas/matplotlib) in your browser via Pyodide.
Run real SQLite queries in your browser — sample data, CSV import, results export.
Explore the AST of JS/TS/JSON/CSS code with switchable parsers — click nodes to highlight source.
Real TypeScript compiler in the browser — see compiled JS, type errors, and AST live.
JSX → live React preview, with Tailwind preloaded. Babel + React 18, all client-side.
Live GLSL fragment-shader editor with iTime / iResolution / iMouse uniforms and PNG export.
See how Babel transforms your JS/JSX/TS — pick presets, plugins, and target, side-by-side.
Write WAT, compile to .wasm bytes, call exported functions, download the binary.
Tailwind HTML preview with responsive viewports + dark mode toggle, all client-side.