JWT Decode Offline
Decode JWT tokens securely offline - no internet connection required
Offline JWT Decoder
This tool works 100% offline - your tokens never leave your device
Download JWT Decoder for Offline Use
Source Code MIT
Get the source code and contribute to our open-source project
Why Use Our Offline JWT Decoder?
Enhanced Security
Your tokens never leave your device. All processing happens locally, ensuring your sensitive data remains secure.
Works Offline
No internet connection required. Decode JWT tokens anytime, anywhere, even in air-gapped environments.
Lightning Fast
Instant decoding without network latency. Optimized for performance on all platforms.
Advanced Features
Token validation, expiration checking, and visual representation of claims in an intuitive interface.
Developer Friendly
Open-source, well-documented, and easily extensible. Use our code in your own applications.
Regular Updates
Frequent updates with new features, security improvements, and support for new JWT standards.
Integration Examples
JavaScript
// Using the jwt-decode library
import jwtDecode from 'jwt-decode';
// Decode the token
try {
const decodedToken = jwtDecode(token);
console.log(decodedToken);
// Access specific claims
const userId = decodedToken.sub;
const expiryTime = decodedToken.exp;
// Check if token is expired
const isExpired = expiryTime < Date.now() / 1000;
} catch (error) {
console.error('Invalid token:', error);
}Node.js
// Using the jsonwebtoken library
const jwt = require('jsonwebtoken');
// Decode without verification
const decoded = jwt.decode(token);
console.log(decoded);
// Decode with verification (if you have the secret)
try {
const verified = jwt.verify(token, 'your-secret-key');
console.log('Token is valid:', verified);
} catch (error) {
if (error instanceof jwt.TokenExpiredError) {
console.log('Token has expired');
} else {
console.log('Token verification failed:', error.message);
}
}Frequently Asked Questions
Yes, our offline JWT decoder is designed with security as a top priority. All token processing happens locally on your device, and no data is ever sent to our servers or any third parties. This makes it ideal for working with sensitive tokens that contain confidential information.
No, once you've downloaded the offline JWT decoder, it works completely without an internet connection. This makes it ideal for secure environments, air-gapped systems, or situations where internet access is limited or unavailable.
Our JWT decoder supports all standard JWT algorithms, including:
- HMAC algorithms: HS256, HS384, HS512
- RSA algorithms: RS256, RS384, RS512
- ECDSA algorithms: ES256, ES384, ES512
- RSA-PSS algorithms: PS256, PS384, PS512
- None algorithm (for unsigned tokens, use with caution)
Yes, the desktop and mobile applications allow you to verify token signatures if you provide the appropriate secret key (for HMAC algorithms) or public key (for RSA and ECDSA algorithms). The browser extension has more limited verification capabilities due to security considerations.
Yes, our JWT decoder is open source and available on GitHub. You can inspect the code, contribute improvements, or even fork the project for your own needs. We believe in transparency, especially for security tools.