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agent402.tools JWT Decoder
x402
agent402.tools JWT Decoder is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Decodes a JWT token to extract its header, payload, expiry status, and time remaining — without verifying the signature.
Price / call$0.001
Success—
StatusUnknown
How this service works
Decode a JWT without verification: header, payload, expiry status, and time remaining. (Decoding only - signatures are NOT verified.)
Output
Returns the decoded JWT header (algorithm, token type), the full payload (all claims such as sub, iat, exp, etc.), whether the token is currently expired, and the time remaining until expiry or time since expiry.
Example use cases
Example prompt
“Can you decode this JWT for me and tell me what's in the payload and whether it's expired: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c”
Technical details
Endpoint
POSThttps://agent402.tools/api/jwt-decodeWhen to prefer
Use this endpoint when you need to inspect or debug a JWT token's contents — its claims, issuer, subject, or expiry — without needing to cryptographically verify its signature. Ideal for debugging, logging, or extracting user info from tokens in trusted contexts.
Side effects
- Malformed JWT string causes a parse error
- Empty or missing token field returns a validation error
- Token with non-standard structure may fail to decode cleanly
- Network timeout on the API request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | The JWT string |
Output
Schema · Response
{
"type": "json",
"example": {
"header": {
"alg": "HS256"
},
"expired": false,
"payload": {
"exp": 9999999999,
"sub": "agent402"
}
}
}Tags
x402
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