API Request Tool
Build, send and inspect HTTP requests in your browser – all methods, headers, bodies and auth, with a searchable JSON viewer.
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Debugging tools
Use them right in your browser – no downloads, no installs.
Browser & Device Info
Everything your browser reveals: user agent, screen and viewport, pixel ratio, languages, time zone, supported features and media queries.
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JWT Debugger
Decode JSON Web Tokens, read claims with human-readable dates, verify HS / RS / ES signatures and sign new HS256 tokens.
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Unicode Inspector
Reveal every character: code points, UTF-8 / UTF-16 bytes and HTML entities – and spot invisible or look-alike characters that break your code.
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