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JWT Decoder / JSON Web Token Parser
x402
JWT Decoder / JSON Web Token Parser is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.0022/call, status unknown (last checked 2026-09-14).
Decodes a JWT's header and payload sections without verifying the signature, returning parsed claims as structured JSON objects.
Price / call$0.0022
Success—
StatusUnknown
How this service works
JWT decoder, JSON Web Token parser, JWT inspector, claims extractor, OAuth token decoder, JWT header parser, JWT payload reader, jwt.io alternative, API token introspection. Decode JWT header and payload (signature NOT verified). For AI agents, OAuth flow debug, API token inspection, auth analysis, jwt claims parser Accepts payment on Base or Solana — either network works.
Output
Returns a JSON object with 'header' (algorithm, token type, key ID etc.) and 'payload' (all claims: sub, iss, exp, iat, aud, custom claims etc.) as parsed objects, plus a 'signature_present' boolean indicating whether a signature segment exists.
Example use cases
Example prompt
“Can you decode this JWT for me and show me what's in the header and payload — I want to see the claims, expiration, and issuer: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c”
Technical details
Endpoint
GEThttps://api.x402node.dev/dev/jwt-decodeWhen to prefer
Use this endpoint when you need to quickly inspect JWT contents — claims, expiry, issuer, algorithm — without needing cryptographic signature verification. Ideal for debugging OAuth flows, inspecting API tokens, or extracting metadata from auth tokens in automated pipelines. Prefer this over jwt.io when operating programmatically from an AI agent.
Side effects
- Malformed or non-JWT string returns a 400 error
- Empty or missing token body returns validation error
- Token with only 1 or 2 segments (incomplete JWT) may fail parsing
- Very large tokens may time out
- Network or payment authorization failure returns 402
Input
{
"token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyLCJleHAiOjE3MTYyMzkwMjIsImlzcyI6Imh0dHBzOi8vZXhhbXBsZS5jb20ifQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"meta": {
"source": "x402node.com"
},
"_hint": "x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)",
"header": {
"alg": "RS256",
"typ": "JWT"
},
"payload": {
"exp": 1716239022,
"iat": 1516239022,
"iss": "https://example.com",
"sub": "1234567890",
"name": "John Doe"
},
"warning": "Signature NOT verified. This endpoint only decodes, does not validate authenticity.",
"analysis": {
"type": "JWT",
"expired": true,
"algorithm": "RS256",
"issued_at": "2018-01-18T01:30:22.000Z",
"expires_at": "2024-05-20T21:03:42.000Z",
"not_before": null,
"has_signature": true,
"expires_in_seconds": -65520503
}
}Tags
x402
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