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Free JWT Decoder - Decode JSON Web Tokens Online

Decode and inspect JWT tokens instantly. View JWT header, payload, and expiry. Free online JWT decoder and inspector for API developers.

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How to use Free JWT Decoder - Decode JSON Web Tokens Online

1

Paste your JWT token into the input field

2

Click 'Decode JWT' to parse the token

3

View the decoded header (algorithm, type) and payload (claims, expiry)

4

Check if the token is expired

Why use this tool?

Instant Decoding

Decode any JWT in milliseconds

100% Private

Token never leaves your browser

Expiry Check

Automatically detect if token is expired

Free JWT Decoder - Inspect JSON Web Tokens Online

Decode JWT tokens instantly to inspect their header, payload, and expiry. Perfect for API developers debugging authentication issues. See all claims, check token expiration, and understand what data is encoded inside any JWT. All decoding happens entirely in your browser—your token is never transmitted anywhere.

Quick How-To Guide

  1. 1Paste your JWT token into the input field
  2. 2Click "Decode JWT" to parse the token
  3. 3View the decoded header (algorithm, token type)
  4. 4View the decoded payload (user claims, expiry, issued at)
  5. 5Check the expiry status displayed automatically

Why use our tool?

Decode header (algorithm & type) with color coding
Decode payload (claims & custom data) in pretty JSON
Automatic expiry detection — shows if token is expired
Display signature section (not decoded — requires secret key)
Copy header and payload as formatted JSON
100% private — token never sent to any server

Frequently Asked Questions

Find answers to common questions about using our tool, its features, and how it handles your data privacy.

JWT (JSON Web Token) is an open standard for transmitting information securely as a compact JSON object. It has 3 parts: header, payload, and signature, joined by dots.
Yes. This tool decodes your token entirely in your browser. The token never leaves your device or gets sent to any server. Safe for debugging development or staging tokens.
No. Signature verification requires the secret key, which should never be shared or pasted into third-party tools. This tool decodes the header and payload only, which is sufficient for most debugging.
JWTs contain an "exp" claim (expiration time as a Unix timestamp). If the current time is past that timestamp, the token is expired and the server will reject it. You'll need to acquire a fresh token.
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