JWT Online Decoder Tool

JSON Web Tokens (JWTs) are a popular way to handle authentication securely in modern web applications.

Use the tool below to decode a JWT and inspect its contents:

What is a JWT?

A JWT is a token that contains 3 parts:

1. Header – typically includes the type of token and the algorithm used.
2. Payload – contains claims such as user ID, roles, and expiry time.
3. Signature – ensures the token hasn’t been tampered with.

Each part is base64-encoded and separated by dots: eyJhbGciOi... (header).eyJzdWIiOi... (payload).SflKxwRJS... (signature)

Note: The tool above does not verify signatures — it's meant for quick inspection only.

Why Decode a JWT?

• Debug token contents during development
• View expiration timestamps
• Inspect custom claims
• Understand third-party authentication flows