Developer Tools

Essential tools for software developers

8 tools

A swiss-army knife for developers: test regular expressions with live matches, pretty-print and validate JSON, minify or beautify code, inspect JWTs, diff files and more — all without leaving the browser.

JSON Formatter

Format, validate and beautify JSON data. Detect syntax errors with helpful messages.

JWT Decoder

Decode and inspect JSON Web Tokens. View header, payload, and signature information.

UUID Generator

Generate random UUIDs (v4). Create single or multiple unique identifiers instantly.

QR Code Generator

Generate downloadable QR codes from any URL or text. Export as SVG or PNG directly in your browser.

Regex Tester

Test regular expressions against text in real-time. See matches highlighted with capture groups.

Cron Expression Parser

Parse cron expressions and see the next scheduled run times. Supports standard 5-field cron syntax.

Diff Checker

Compare two texts and see the differences highlighted. Find additions, deletions, and changes.

JSON → TypeScript Interface

Generate TypeScript interfaces automatically from any JSON object. Handles nested objects, arrays, nullable values, and optional fields. Paste JSON and get ready-to-use TypeScript.