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JWT Decoder
x402
JWT Decoder is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).
Decodes a JSON Web Token and returns the header, payload claims, human-readable timestamps, expiry status, seconds until expiry, and security warnings like alg=none — no signature verification, nothing stored.
Price / call$0.01
Success—
StatusUnknown
How this service works
Decode JWT: paste a JSON Web Token and get the decoded header, payload claims, human-readable iat/exp/nbf times, expired or not-yet-valid status, seconds until expiry and security warnings such as alg=none. No signature verification, nothing stored. $0.01 per token.
Output
Returns the decoded JWT header (including algorithm), all payload claims as a structured object, human-readable versions of iat/exp/nbf timestamps, a boolean or status indicating whether the token is expired or not-yet-valid, seconds remaining until expiry, and any security warnings such as alg=none usage. No signature verification is performed and nothing is persisted.
Example use cases
Debugging expired auth token
“I've got a JWT that's causing 401 errors in my app — can you decode it and tell me if it's expired, what the exp time is in human-readable form, and whether there are any obvious security issues like alg=none? Token: eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.eyJzdWIiOiJ1c2VyMTIzIiwiZXhwIjoxNjAwMDAwMDAwfQ.”
Auditing JWT algorithm security
“Can you inspect this JWT token and let me know what signing algorithm it's using, whether that algorithm is considered insecure, and any other security warnings? eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoiYWRtaW4iLCJpYXQiOjE3MDAwMDAwMDB9.abc123”
Checking token validity window
“I need to know if this JWT is currently valid — specifically whether it's not yet active (nbf hasn't passed) or already expired, and how many seconds are left until it expires. Here's the token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYmYiOjE3MDAwMDAwMDAsImV4cCI6MTk5OTk5OTk5OX0.signature”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/decode-jwt?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to quickly inspect the contents of a JWT — its claims, timestamps, and algorithm — without needing cryptographic signature verification. Ideal for debugging authentication issues, auditing token security configurations (especially detecting dangerous alg=none), or extracting human-readable expiry information from tokens at $0.01 per call. Not suitable when you require server-side signature verification or need to validate the token's authenticity.
Side effects
- Malformed or non-base64-encoded token string results in a parse error response
- Missing 'input' query parameter causes a 400-style validation error
- Token with no exp claim may return null for expiry fields
- Network or service unavailability returns a 5xx error
- Unsupported JWT format (e.g. JWE encrypted tokens) may return an error or incomplete decode
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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