developer tools

Developer Tools

Free browser-based utilities for encoding, formatting, generating, and debugging. No sign-up, no data sent to servers.

{}
JSON formatter
Format & validate JSON
64
Base64
Encode & decode
⊕
UUID generator
Generate unique IDs
⌁
URL encoder
Encode & decode URLs
.*
Regex tester
Test regular expressions
⊗
JWT decoder
Inspect JWT tokens
⏱
Cron parser
Explain cron expressions

About these developer tools

All tools run entirely in your browser using native Web APIs: JSON.parse for formatting, btoa/atob for Base64, crypto.randomUUID() for UUIDs, encodeURIComponent for URL encoding, the RegExp constructor for regex testing, and base64 decoding for JWT inspection. Nothing is sent to a server. Developer tools are the highest-CPM category on the site — bookmark this page.