JWT Toolkit
Decode, verify, generate and analyze JSON Web Tokens online.
1. Decode JWT Token
Decode JWT header, payload, claims and signature information.
2. Verify JWT Signature
Verify HS256 JWT token signatures using your secret key.
3. Generate JWT Token
Create HS256 JWT tokens using JSON payload and secret key.
Continue Your Workflow
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Free JWT Toolkit to Decode and Analyze JSON Web Tokens
Decode JWT headers and payloads, inspect claims, review expiration values and debug authentication tokens used by APIs, SPAs and mobile apps.
What is a JWT?
A JSON Web Token is a compact token format commonly used for authentication and authorization. It usually contains a header, payload and signature separated by dots.
Developers inspect JWTs to understand user claims, expiration times, issuer values, audience values and authentication behavior. Sensitive tokens should be handled carefully because payload data is often readable after decoding.
Key Features
Header Inspection
Read token type and signing algorithm details.
Payload Claims
Inspect user IDs, roles, issuer, audience and custom claims.
Expiration Debugging
Review token timing issues during login and API testing.
Authentication Workflow
Understand how frontend and backend systems exchange tokens.
Common Use Cases
How to Use This Tool
- 1 Paste the JWT into the toolkit.
- 2 Review the decoded header and payload.
- 3 Check expiration and claim values.
- 4 Use the output to debug your authentication flow.
Frequently Asked Questions
Is a decoded JWT secret?
The payload can often be read by anyone with the token. Do not put sensitive secrets in JWT payloads.
Does decoding verify the signature?
Decoding and verifying are different. Verification requires the correct secret or public key.
Can I paste production tokens?
Avoid pasting active production tokens into online tools unless your security policy allows it.