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JWT Decoder / JSON Web Token Inspector
x402
JWT Decoder / JSON Web Token Inspector is a paid API for AI agents from x402-deployer.x402-deployer.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Decodes and inspects JWT tokens by parsing header, payload, and standard claims without signature verification
Price / call$0.003
Success—
StatusUnknown
How this service works
JWT decoder / JWT parser / JSON Web Token inspector / Bearer token debugger / OAuth ID-token reader / Auth0 + Cognito + Firebase token inspector. Base64URL-decodes header and payload, parses standard claims (iss, aud, sub, exp, iat, nbf, jti), reports algorithm, key id (kid), token type (typ), TTL, and clock-validity (is_expired / is_not_yet_valid / is_currently_valid_by_clock). Does NOT verify signatures — for inspection only, never trust output for auth decisions.
Output
Returns decoded JWT header fields (algorithm, kid, typ), payload with all standard claims (iss, aud, sub, exp, iat, nbf, jti), computed TTL in seconds, and clock-validity status flags (is_expired, is_not_yet_valid, is_currently_valid_by_clock). Does not verify the signature.
Example use cases
Example prompt
“Can you decode this JWT for me and tell me who issued it, what the subject is, whether it's expired, and what algorithm it uses: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwiaXNzIjoiYXV0aDAuY29tIiwiZXhwIjoxNjAwMDAwMDAwfQ.signature”
Technical details
Endpoint
POSThttps://x402-deployer.x402-deployer.workers.dev/jwt-decodeWhen to prefer
Use this endpoint when you need to quickly inspect or debug the contents of a JWT token — extracting claims like issuer, subject, expiration, and algorithm — without needing to verify its cryptographic signature. Ideal for debugging Auth0, Cognito, Firebase, or generic OAuth tokens during development or troubleshooting.
Side effects
- Malformed or non-JWT string returns a parse error
- Token with invalid Base64URL encoding fails to decode
- Missing required token field returns a 400-level error
- Expired token is still decoded but flagged as is_expired=true
Input
{
"input": {
"body": {
"jwt": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyMTIzIiwiaXNzIjoiZXhhbXBsZS5jb20iLCJleHAiOjk5OTk5OTk5OTksImlhdCI6MTYwMDAwMDAwMH0.test_signature"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"note": "Signature is NOT verified. This endpoint only decodes structure. To verify, fetch the issuer's JWKS and validate against the alg + kid.",
"type": "JWT",
"claims": {
"jti": null,
"issuer": "example.com",
"subject": "user123",
"audience": null,
"issued_at": "2020-09-13T12:26:40.000Z",
"expires_at": "2286-11-20T17:46:39.000Z",
"not_before": null,
"ttl_seconds": 8219299771
},
"header": {
"alg": "HS256",
"typ": "JWT"
},
"key_id": null,
"payload": {
"exp": 9999999999,
"iat": 1600000000,
"iss": "example.com",
"sub": "user123"
},
"algorithm": "HS256",
"signature": "test_signature",
"is_expired": false,
"is_not_yet_valid": false,
"payload_size_bytes": 71,
"is_currently_valid_by_clock": true
}Tags
x402
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