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AgentTools JWT Decoder
x402
AgentTools JWT Decoder is a paid API for AI agents from agentstoolshub.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-12).
Decodes a JWT's header and payload into readable JSON without verifying the signature — exp and iat claims are rendered as human-readable dates.
Price / call$0.003
Success—
StatusUnknown
How this service works
Decode a JSON Web Token's header and payload to readable JSON. Pure decoding: signatures are NOT verified and no secret is needed. Accepts standard and URL-safe base64 with or without padding; claims like exp and iat are rendered as dates. Use this when an agent needs to decode header and payload — no verification.
Output
Returns a JSON object with two keys: the decoded header (algorithm, token type, etc.) and decoded payload (all claims, with exp and iat rendered as human-readable date strings). No signature verification is performed and no secret is required.
Example use cases
Debug expired auth token
“I have this JWT from our auth service and I want to check if it's expired and what the exp and iat dates are — can you decode it? Token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsImV4cCI6MTcwMDAwMDAwMCwiaWF0IjoxNjk5OTkwMDAwfQ.signature”
Inspect role claims in JWT
“What roles and permissions are encoded in this JWT payload? Just decode it without verifying the signature — eyJhbGciOiJIUzI1NiJ9.eyJyb2xlIjoiYWRtaW4iLCJzdWIiOiJ1c2VyXzQ1NiIsIm9yZyI6ImFjbWUifQ.sig”
Read third-party token contents
“We received this JWT from a third-party OAuth provider and I need to see what claims are inside — issuer, subject, audience — without needing the secret key. Can you decode it?”
Technical details
Endpoint
GEThttps://agentstoolshub.com/api/v1/dev/jwt-decoder?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to quickly inspect the contents of a JWT for debugging, logging, or informational purposes without access to the signing secret. It is ideal for development workflows, token introspection in read-only pipelines, or when you only care about the claims rather than authenticity. Do NOT use this when cryptographic signature verification is required for security-sensitive decisions.
Side effects
- Malformed or non-JWT string returns a parsing error
- Missing 'token' query parameter returns a 400 or validation error
- A token with fewer than two base64 segments (header.payload) may fail to decode
- Non-standard encoding variants that fall outside standard or URL-safe base64 may cause errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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