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Foundry JWT Decoder
x402
Foundry JWT Decoder is a paid API for AI agents from minty-sprout.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-11-01).
Decodes a JWT into its header, payload, issued/expiry times, and expiration status without verifying the signature.
Price / call$0.001
Success—
StatusUnknown
How this service works
JWT decoder: header, payload, issued and expiry times, and whether it has expired (signature not verified). Input: a JWT.
Output
A JSON object containing the decoded JWT header (with algorithm and type), the full payload (all claims such as sub, iat, exp, etc.), UTC-formatted expiry and issued-at times, a boolean indicating whether the token has expired, and a note clarifying that the signature is not verified.
Example use cases
Check if session token has expired
“I have a JWT from our auth service and I want to know if it's still valid or has expired — can you decode it and check the expiry? Token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsImV4cCI6MTcwMDAwMDAwMH0.abc123”
Debug JWT claims in development
“I'm debugging my app and need to see exactly what's inside this JWT — show me the header algorithm, all the payload claims, and when it expires in UTC: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJkZXZfdXNlciIsInJvbGUiOiJhZG1pbiIsImV4cCI6MTkwMDAwMDAwMH0.xyz789”
Extract user identity from token
“Pull out the subject and any other identity fields from this JWT so I can see who it belongs to and when it was issued: eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzk5IiwiaWF0IjoxNjAwMDAwMDAwLCJleHAiOjE2MDAwMDM2MDB9.sig”
Technical details
Endpoint
POSThttps://minty-sprout.onrender.com/v1/jwt-decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to quickly inspect the contents of a JWT — its claims, expiry, and header — without needing cryptographic signature verification. Ideal for debugging, logging, expiry checks, or extracting identity fields from tokens in a trusted context where signature validation is handled elsewhere.
Side effects
- Malformed or invalid JWT string returns an error — token must be a valid dot-separated base64url string
- Empty or missing input field returns a validation error
- Very long tokens may be rejected if they exceed the 8000-character input limit
- Tokens with non-standard encoding may fail to parse correctly
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | A JSON Web Token |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Decoded only; the signature is not verified.",
"header": {
"alg": "HS256"
},
"expired": true,
"payload": {
"exp": 1700000000,
"sub": "123"
},
"times_utc": {
"exp": "2023-11-14T22:13:20+00:00"
},
"signature_verified": false
}
}Tags
x402
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