Online Developer Tools
Developer tools collect the small utilities you reach for while coding: format and validate JSON, YAML and XML, test regular expressions, decode JWTs, encode and decode Base64, and generate strong passwords. Everything runs in your browser, so pasting API responses or config files is safe.
- 9 tools
- Free
- No sign-up
- JSON Formatter Beautify, minify and validate JSON with error line numbers.
- YAML Formatter Validate and format YAML, convert YAML ⇄ JSON.
- XML Formatter Pretty-print, minify and validate XML.
- Regex Tester Test regular expressions live with highlighted matches.
- JWT Decoder Decode a JWT header, payload and expiry.
- Base64 Encode & Decode Convert text to and from Base64, UTF-8 and URL-safe.
- Password Generator Generate strong random passwords with custom length.
- Cron Expression Generator Explain a cron schedule and list its next run times.
- SQL Formatter Beautify SQL queries with uppercase keywords and indented subqueries.
When you need these tools
API responses often arrive as one long line of JSON. The JSON Formatter indents it and pinpoints syntax errors. When you convert a config from JSON to YAML or check a Kubernetes manifest's indentation, use the YAML Formatter.
Writing validation or log-parsing rules? The Regex Tester highlights matches as you type. Debugging a login flow? The JWT Decoder shows the token payload and expiry.
FAQ
Is it safe to paste company API data?
Yes. Developer tools run entirely in your browser; nothing is sent to a server or logged.
Does the JWT decoder verify signatures?
No. It only decodes the header and payload for debugging. Signature verification needs your secret key and should happen on your server.