Data & Debugging developer tools
Inspect JWTs (decode only), test regular expressions, convert Unix timestamps, and look up HTTP status codes or MIME types. Lookups do not fetch remote URLs.
Regex testing, JWT decode, HTTP status lookup, and similar inspect-only utilities.
More in this category: JWT Decoder · Regex Tester
JWT Decoder
Paste a JSON Web Token to read its header (algorithm, key ID) and payload claims (subject, expiry, scopes) as formatted JSON.
Unix Timestamp Converter
Convert Unix epoch timestamps to readable UTC dates, or convert a date back to a Unix timestamp in seconds.
Regex Tester
Write a JavaScript regular expression, paste sample text, and see every match with its position and capture groups.
Color Converter
Convert hex and rgb() colors to hex, RGB, and HSL.
HTTP Status Code Lookup
Search common HTTP status codes by number or name, and see what each response class means for browsers, APIs, and search engines.
MIME Type Lookup
Find the correct Content-Type header for a file extension, or the extension for a MIME type, from a list of common web formats.
User-Agent Parser
Paste a User-Agent string to extract a browser version token, a rendering-engine guess, the first OS fragment in the parentheses, and whether the string looks mobile.
Related guides
- JSON Formatting and Validation: Complete Guide
- JSON vs JSON5: What's the Difference?
- Base64 Encoding Explained