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AgentTools JWT Decoder
x402
AgentTools JWT Decoder is a paid API for AI agents from agenttools-hub.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Decodes a JWT's header and payload into readable JSON without verifying the signature, rendering timestamp claims as human-readable dates.
Price / call$0.001
Success—
StatusUnknown
How this service works
Decode a JSON Web Token's header and payload to readable JSON. Pure decoding: signatures are NOT verified and no secret is needed. Claims like exp and iat are rendered as dates. Use this when an agent needs to decode header and payload — no verification.
Output
Returns the decoded JWT header and payload as structured JSON objects, with timestamp fields like exp and iat converted to human-readable date strings. No signature verification is performed — the raw claims are surfaced as-is.
Example use cases
Inspect expired token in debugging
“I'm getting an auth error and have this JWT — can you decode it and tell me when it was issued and when it expires? Token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsImlhdCI6MTY5MDAwMDAwMCwiZXhwIjoxNjkwMDAzNjAwfQ.signature”
Read user claims from token
“Decode this JWT for me so I can see what user ID and roles are embedded in the payload: eyJhbGciOiJIUzI1NiJ9.eyJ1c2VySWQiOiJhYmMxMjMiLCJyb2xlcyI6WyJhZG1pbiIsInVzZXIiXX0.sig”
Audit token header algorithm
“What algorithm and token type are specified in the header of this JWT? eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ0ZXN0In0.sig”
Technical details
Endpoint
GEThttps://agenttools-hub.vercel.app/api/v1/dev/jwt-decoder?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to quickly inspect the contents of a JWT — such as reading claims, checking expiry, or identifying the algorithm — without needing to validate the signature. Ideal for debugging, logging, or displaying token metadata. Not suitable when signature verification or security enforcement is required.
Side effects
- Malformed JWT (not three dot-separated base64 segments) returns a decode error
- Missing required 'token' query parameter results in a bad request response
- Passing a non-JWT string (e.g. an opaque token) returns garbled or error output
- Network or service unavailability returns a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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