JWT Token Parser online free — large files supported

Decode and inspect JWT tokens — view header, payload, and signature.

Explanation

JWT Token Parser is a fast, free online tool for parsers. Paste your input, click Run, and get results instantly via our API-backed processing.

Input

Output

Input Format

Plain Text

Example

Example Input

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Example Output

=== JWT Header ===
{
  "alg": "HS256",
  "typ": "JWT"
}

=== JWT Payload ===
{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022
}

=== Signature ===
SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

=== Details ===
Algorithm: HS256
Type: JWT
Issued at: 2018-01-18T01:30:22+00:00
Subject: 1234567890

Use Cases

Debug authentication issues by decoding JWT tokens to inspect claims, expiration times, and payload data without making API calls
Validate JWT token structure and signature to ensure tokens are properly signed and haven't been tampered with
Extract user permissions and roles from JWT payload to troubleshoot authorization problems in applications
Analyze token expiration timestamps to diagnose session timeout issues and refresh token logic
Compare multiple JWT tokens side-by-side to identify differences in claims during development and testing
Verify JWT header algorithm and key ID to ensure tokens are using the correct signing method and keys

How to Use JWT Token Parser

Paste or type your input data in the left text area
Click the Run button to process via the API
Copy the result from the output area

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Frequently Asked Questions

How is my data processed?

Data is processed on the server via API; we do not store content beyond processing and only log minimal technical metadata.

What is JWT Token Parser?

JWT Token Parser is a free online tool that processes your input via a secure API and returns results instantly.

Is JWT Token Parser free to use?

Yes, JWT Token Parser is completely free with no registration required. You can also access it via our API with a generous free tier.

Is my data safe with JWT Token Parser?