agentutility$ man jwt-decode
/jwt-decode
PRICE / CALL
$0.003
USDC · base mainnet · scheme: exact
METHOD
POST
CLUSTER
webprobeCATEGORY
utilities
STATUS
● live
NAME
jwt-decode — jwt decoder / token inspector / debug tool
SYNOPSIS
POST https://x402.agentutility.ai/jwt-decode
Content-Type: application/json
X-PAYMENT: <signed-transferWithAuthorization>
{ ... }↳ first call →
402 Payment Required. Sign USDCtransferWithAuthorization, retry with theX-PAYMENT header.DESCRIPTION
JWT decoder / token inspector / debug tool. Splits a JWT into header / payload / signature, base64url-decodes each, parses claims (iss, aud, sub, jti, iat, exp, nbf, kid, alg), and reports clock-validity. Does NOT verify signatures.
INPUT — request schema
| property | type | description | req? |
|---|---|---|---|
| jwt | string | JWT (with or without 'Bearer ' prefix). | required |
OUTPUT — response shape
| field | type | description |
|---|---|---|
| header | object | Decoded JWT header object with parsed JOSE fields like alg, typ, kid, and any custom header parameters. |
| payload | object | Decoded JWT payload object with all claims parsed from the base64url-decoded middle segment. |
| signature | string | Raw signature segment from the JWT as a base64url string; not verified by this endpoint. |
| algorithm | string | Signing algorithm declared in the header's alg field, such as HS256, RS256, ES256, or none. |
| key_id | string | Key identifier from the header's kid field, used by verifiers to select the right signing key. |
| type | string | Token type from the header's typ field, typically JWT but sometimes at+jwt or similar variants. |
| claims | object | Standard JWT claims extracted from payload: iss, aud, sub, jti, iat, exp, nbf with parsed timestamps. |
| is_expired | boolean | True if exp claim is present and the expiration timestamp is in the past relative to server clock. |
| is_not_yet_valid | boolean | True if nbf claim is present and the not-before timestamp is in the future relative to server clock. |
| is_currently_valid_by_clock | boolean | True if the token is neither expired nor not-yet-valid by clock; signature validity is not checked. |
| payload_size_bytes | number | Byte length of the decoded payload JSON, useful for spotting oversized tokens. |
| note | string | Reminder that this endpoint only decodes and clock-checks; it does not cryptographically verify signatures. |
EXAMPLES — two ways to call
EXAMPLE 1 · curl
curl -X POST https://x402.agentutility.ai/jwt-decode \
-H 'Content-Type: application/json' \
-d '{ }'first response =
402 Payment Required with payment requirements; sign + retry with X-PAYMENT.EXAMPLE 2 · mcp
# MCP packages on npm under # @agentutility/mcp-* (one per cluster) # # Catalog + install: # https://mcp.agentutility.ai # # Or call jwt-decode directly over HTTP — see above.
MCP server handles payment automatically — your coding agent just calls the tool by name.
METADATA
- tags
- jwttokenauthdebugdeveloper
- methods
- POST
- cluster
- webprobe
- price
- $0.003 USDC per call
ADJACENT — other endpoints in webprobe
| endpoint | description | price |
|---|---|---|
| crates-io-stats | Crates.io package stats / Rust crate registry lookup / cargo package metadata / Rust ecosystem stats. | $0.003 |
| homoglyph-check | Homoglyph attack detector / Unicode lookalike scanner. | $0.003 |
| npm-package-stats | npm package stats / npm registry lookup / npm downloads / package release history / lightweight package metadata. | $0.003 |
| pypi-package-stats | PyPI package stats / Python package registry lookup / pip package metadata / pypistats downloads / Python ecosystem metadata. | $0.003 |
| url-metadata-extract | URL metadata extractor / OG tags / Open Graph parser / Twitter Card parser / meta tag extractor / link preview / page metadata / favicon… | $0.003 |
| arxiv-bibtex | arXiv to BibTeX / arxiv citation generator / paper bibtex / LaTeX citation builder / academic citation lookup. | $0.002 |
| github-readme | GitHub README fetch / repo readme / open-source-readme-as-markdown / package documentation puller. | $0.002 |
| keyword-suggest | Keyword autocomplete / search suggest / SEO keyword research / query expansion / autocomplete suggestions. | $0.002 |
SEE ALSO