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JWT Decoder
x402
JWT Decoder is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Decodes a JSON Web Token (without verification) to extract header, algorithm, payload claims, issued-at/expiry times, and expiration status.
Price / call$0.002
Success—
StatusUnknown
How this service works
Decode a JSON Web Token without verifying it: header, algorithm, payload claims, issued-at/expiry times and whether it has expired. Use to debug auth tokens and API sessions.
Output
Returns the decoded JWT header (including algorithm), full payload claims, issued-at and expiry timestamps in human-readable form, and a boolean indicating whether the token has already expired. No cryptographic signature verification is performed.
Example use cases
Debug expired API session token
“I'm getting 401 errors from an API and want to check if my token has expired — can you decode this JWT and tell me the expiry time and whether it's still valid: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsImV4cCI6MTcwMDAwMDAwMH0.signature”
Inspect auth token claims in CI pipeline
“During our CI build, we generate an auth token and I need to verify it contains the right user ID and roles — can you decode this JWT and show me all the payload claims: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VySWQiOiJhYmMxMjMiLCJyb2xlIjoiYWRtaW4ifQ.sig”
Check JWT algorithm used by third-party service
“We're auditing a third-party integration and need to know what signing algorithm their tokens use — please decode this JWT and show me the header and algorithm: eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJ0aGlyZHBhcnR5LmNvbSJ9.sig”
Technical details
Endpoint
GEThttps://bess-x402.onrender.com/v1/util/jwt-decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to quickly inspect JWT contents for debugging purposes — reading claims, checking expiry, or identifying the algorithm — without needing to verify the signature. Ideal for developer tooling, CI pipelines, and auth debugging workflows. Prefer this over writing custom base64 decode logic or using a local library when operating in an agentic context.
Side effects
- Malformed or non-JWT string input returns a parse error
- Missing 'token' query parameter results in a 400 bad request
- Tokens with non-standard encoding may fail to parse
- Network or server errors on the hosted Render instance may cause timeouts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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