Decode a JWT header and claims without verifying it
Decode a JWT header and claims without verifying it - issuer, subject, audience, issued, not-before and expiry times, lifetime and security warnings
Answers HTTP 404 without x402 payment termsour last check, 2026-10-18
0 of 1checks answered this week
n/amedian answer time
$0.01listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://saylorinnovations.com/api/dev/jwt-decode
| Category | Everything else |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | no x402 terms | 404 | 15 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
],
"type": "string"
},
"queryParams": {
"properties": {
"token": {
"description": "JWT string (header.payload.signature); use expired or test tokens only",
"type": "string"
}
},
"required": [
"token"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"algorithm": {
"type": [
"string",
"null"
]
},
"audience": {},
"custom_claims": {
"description": "Custom claims",
"type": "array"
},
"expired": {
"type": [
"boolean",
"null"
]
},
"expires_at": {
"description": "Expires at",
"type": [
"object",
"null"
]
},
"header": {
"type": "object"
},
"issued_at": {
"description": "Issued at (UTC unless a time zone is given)",
"type": [
"object",
"null"
]
},
"issuer": {},
"key_id": {
"description": "Key id identifier"
},
"lifetime_seconds": {
"description": "Lifetime, in seconds"
},
"not_before": {
"description": "Not before"
},
"note": {
"description": "Caveat or context for reading the result",
"type": "string"
},
"payload": {
"type": "object"
},
"signature_bytes": {
"description": "Signature, in bytes",
"type": [
"number",
"null"
]
},
"signature_present": {
"description": "Signature present",
"type": [
"boolean",
"null"
]
},
"signature_verified": {
"description": "Signature verified",
"type": "boolean"
},
"source": {
"description": "Data source the values come from",
"type": "string"
},
"subject": {
"description": "What this response is for",
"type": [
"string",
"null"
]
},
"token_type": {
"description": "Token type",
"type": [
"string",
"null"
]
},
"warnings": {
"type": "array"
}
},
"required": [
"header",
"payload",
"warnings"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}