About

Security

JWT Decoder

Decode JSON Web Tokens online and inspect their header and payload in your browser.

Features

  • Header and payload inspection
  • Readable JSON output
  • No signature verification claim

How to use it

  1. Paste a JWT into the decoder.
  2. Inspect the header and payload sections.
  3. Use the claims to debug token data.

Example and use cases

Inspect an exp claim while troubleshooting an authenticated API request.

Useful for learning JWT structure and debugging tokens during local API development.

Security Tool

JWT Decoder

Decode JWT tokens and inspect their header, payload, and signature directly in your browser.

Input

Paste your JWT token below.

01

Read the token

The tool reads the JWT provided in the input field.

02

Split the JWT

A JWT normally contains header, payload, and signature sections.

03

Decode JSON

The header and payload are decoded from Base64URL into readable JSON.

Example

Click the Example button above to load a sample JWT token. Then click Decode JWT to see its header and payload.

FAQ

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Generate unique UUID values.

Frequently asked questions

Does decoding a JWT verify its signature?

No. Decoding reveals the encoded header and payload; signature verification requires the correct key and server-side validation.

Related developer tools

REST API TesterJSON FormatterJWT Secret Key Generator