JWT Encoder/Decoder
Create, decode, and verify JSON Web Tokens (JWT) with our comprehensive JWT tool. Supports multiple signing algorithms, custom claims, and token validation.
Features
Multiple Algorithms
Support for HS256, HS384, HS512, RS256, RS384, RS512, and more signing algorithms.
Custom Claims
Add and edit custom claims in the payload with JSON validation and formatting.
Token Verification
Verify JWT signatures and validate token claims including expiration and issuer.
How It Works
Encoding JWT
1. Enter your payload data (claims)
2. Select a signing algorithm
3. Provide the secret key or keypair
4. Generate the JWT token
Decoding JWT
1. Paste your JWT token
2. View the decoded header and payload
3. Verify the signature with your key
4. Check token validity and claims
Frequently Asked Questions
What is a JWT?
JSON Web Token (JWT) is an open standard for securely transmitting information between parties as a JSON object. It can be signed using a secret or public/private key pair.
Which algorithms should I use?
For symmetric signing, HS256 is commonly used. For asymmetric signing, RS256 is recommended. Choose based on your security requirements and use case.
Is it secure to use online?
All processing is done locally in your browser. No data is sent to any server. However, for production use, never share your secret keys or sensitive data.
Security Notice
This tool is for development and testing purposes only. Never share sensitive keys or tokens. For production use, implement proper security measures and use secure key management practices.