JWT Inspector
Inspect and decode JWT tokens without signature verification to view payload and expiration.
Two tokens that both decode into a similar-looking payload can still differ in one detail that actually matters, the header's algorithm field, HS256 versus RS256, especially when integrating against an unfamiliar auth provider where a mismatched signing algorithm causes a rejection that looks like an entirely different problem. This tool inspects and decodes a JWT without verifying its signature, surfacing the header's algorithm alongside the payload and expiration rather than only the claims.
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Useful for confirming which signing algorithm an unfamiliar token actually uses before integrating with a new auth provider, diagnosing an algorithm mismatch error that looks unrelated to signing at first glance, or inspecting a token's full header and payload together during development without needing the actual signing secret.
Key features
- Clean interface
- Fast processing
- No signup required
- Works offline