Decode, verify, and create JSON Web Tokens with advanced features. All processing happens in your browser.
💡 Use a strong secret key (at least 256 bits) in production
💡 Accounts for clock drift when validating exp/nbf/iat claims.
const jwt = require('jsonwebtoken');
// Sign a token
const token = jwt.sign(
{ sub: '1234567890', name: 'John Doe' },
'your-256-bit-secret',
{ expiresIn: '1h' }
);
// Verify a token
const decoded = jwt.verify(token, 'your-256-bit-secret');import jwt
import datetime
# Encode a token
payload = {
'sub': '1234567890',
'name': 'John Doe',
'exp': datetime.datetime.utcnow() + datetime.timedelta(hours=1)
}
token = jwt.encode(payload, 'secret', algorithm='HS256')
# Decode a token
decoded = jwt.decode(token, 'secret', algorithms=['HS256'])Security Best Practices