Jwt Security Validator API

POST https://api.findutils.com/api/tools/jwt-security-validator/execute

Decode a JWT and return a list of security checks (algorithm strength, expiration, not-before, issued-at, issuer, audience, subject, signature presence) plus an overall valid flag. Does NOT verify the signature — it only inspects claims and header fields.

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Request body

application/json

token

string required

The JWT to inspect (three dot-separated base64url segments).
now

integer optional

Unix timestamp (seconds) to evaluate time claims against. Default: current time.

Example arguments

Verified

{
  "token": "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ4In0.sig"
}

curl -X POST https://api.findutils.com/api/tools/jwt-security-validator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "token": "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ4In0.sig"
  }'

const response = await fetch('https://api.findutils.com/api/tools/jwt-security-validator/execute', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({"token":"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ4In0.sig"}),
});
const data = await response.json();

import requests

response = requests.post(
    "https://api.findutils.com/api/tools/jwt-security-validator/execute",
    json={"token":"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ4In0.sig"},
)
data = response.json()

$ch = curl_init('https://api.findutils.com/api/tools/jwt-security-validator/execute');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS => '{"token":"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ4In0.sig"}',
    CURLOPT_RETURNTRANSFER => true,
]);
$data = json_decode(curl_exec($ch), true);

Also an MCP tool

Call jwt_security_validator from Claude, Cursor or any MCP client. Same arguments, same output.

https://mcp.findutils.com

MCP reference

Rate limit: 60 a minute, per IP
Auth: None
REST id: jwt-security-validator
MCP name: jwt_security_validator
Category: Developer
Machine-readable: openapi.json · markdown.md

Request body

Example arguments

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