Free Developer Tools

Convert any JSON payload into clean TypeScript interfaces or type aliases, including nested objects, arrays, and nullable fields.

Convert JSON into C# POCO classes for System.Text.Json, with nested classes, List<T> arrays, and nullable types.

Convert a Node.js API request or response body into TypeScript interfaces or type aliases for Express, Fastify, or NestJS.

Generate a strong, random password with crypto.getRandomValues, or check your own password's strength.

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes of text, and verify text against a known hash.

Generate cryptographically secure, random (v4) UUIDs in bulk, with uppercase and no-hyphens options.

Turn any text or URL into a QR code, with adjustable error correction and PNG/SVG download.

Count words, characters, sentences, and paragraphs, with reading and speaking time estimates.

Estimate your US take-home pay after federal tax, state tax, Social Security, and Medicare, for all 50 states.

Pretty-print or minify JSON with adjustable indentation and instant syntax validation.

Check JSON for syntax errors and get the exact line and column where parsing fails.

Decode a JSON Web Token to inspect its header and payload claims, entirely in your browser.

Convert colors between HEX, RGB, HSL, and OKLCH with a live preview.

Test regular expressions against sample text with live match highlighting and capture groups.

Encode or decode URL components and full query strings without round-tripping to a server.

Escape or unescape HTML entities for safely embedding text in markup.