Free Online Developer Toolbox
Essential utilities for software engineers: UUID generators, SQL beautifiers, and regex testers.
UUID / GUID Generator
Generate random cryptographically secure v4 UUIDs in bulk.
SQL Query Formatter & Beautifier
Format and beautify unformatted SQL queries with standard indentation & keyword casing.
Regex Tester & Debugger
Test JavaScript regular expressions online with live match highlights and capture groups.
JWT Debugger & Decoder
Decode and inspect JSON Web Tokens (Header, Payload, Claims) with 100% client-side privacy.
Cron Expression Generator
Generate, inspect, and translate crontab schedule expressions into human-readable English and Chinese.
cURL to Code Converter
Convert cURL commands to Python requests, JavaScript fetch, Axios, Go net/http, and PHP cURL code instantly.
Markdown Table Generator
Create, edit, and export clean Markdown tables visually with a spreadsheet-like editor.
Hash & Checksum Calculator
Compute MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes 100% in-browser using Web Crypto API.
Open Graph (OG) & Twitter Card Previewer
Preview Open Graph and Twitter summary cards with large image live in-browser. Generate ready-to-use Next.js 15 & HTML meta tags.