Decode JSON Web Tokens to inspect header and payload information
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Standard JWT used for user authentication in web applications.
Contains: User ID, username, role, and issued at timestamp.
JWT used for accessing protected API endpoints.
Contains: API access permissions, scopes, and expiration time.
JWT used for verifying user email addresses.
Contains: User ID, email address, and token type.
JWT used for obtaining new access tokens.
Contains: User ID, token type, and long expiration time.
JWT used for tracking user analytics while preserving privacy.
Contains: Anonymous user tracking data and events.
JWT used for secure payment processing.
Contains: Payment details, amount, currency, and status.
Learn the basics of JSON Web Tokens, how they work, and why they're essential for modern authentication.
Read Tutorial →Step-by-step guide to implementing JWT authentication in web applications using various programming languages.
Read Tutorial →Learn how to securely implement JWT in your applications and avoid common security pitfalls.
Read Tutorial →Compare JWT and traditional session-based authentication and learn when to use each approach.
Read Tutorial →Learn about the most common security pitfalls when implementing JWT and how to avoid them.
Read Tutorial →Best practices for testing your JWT implementation, including validation and security testing.
Read Tutorial →Compare our free JWT decoder with other popular tools and services:
| Feature | Our Tool | Online Tool A | Paid Service B | Command Line |
|---|---|---|---|---|
| Free to Use | ✅ | ✅ | ❌ | ✅ |
| Client-side Processing | ✅ | ❌ | ✅ | ✅ |
| Pretty JSON Output | ✅ | ✅ | ✅ | ❌ |
| Copy Functionality | ✅ | ✅ | ✅ | ✅ |
| Embed Code | ✅ | ❌ | ❌ | ❌ |
| API Access | ❌ (Client-side only) | ❌ | ✅ ($) | ✅ |
| Mobile Friendly | ✅ | ✅ | ✅ | ❌ |
| Educational Content | ✅ | ❌ | ❌ | ❌ |
| Privacy (Client-side) | ✅ | ❌ | ❌ | ✅ |
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JWT (JSON Web Token) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
A JWT consists of three parts separated by dots (.):
JWTs can be signed using a secret or a public/private key pair, ensuring the token hasn't been tampered with.
Follows RFC 7519 standard, ensuring interoperability across different systems and languages.
JWTs are compact and can be sent through URLs, POST parameters, or inside HTTP headers.
All required information is contained within the token itself, reducing database lookups.
JWTs contain claims which are statements about an entity. Some registered claims include:
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