Introduction to JSON Web Token Logger

The jsonwebtoken-logger is a powerful tool designed to enhance the security and debugging capabilities of your application. It allows you to efficiently log, verify, and manage JSON Web Tokens (JWTs) within your applications. This guide provides a comprehensive overview of the jsonwebtoken-logger APIs, complete with code snippets and practical examples.

API Examples

1. Logging a JWT

The core functionality of the jsonwebtoken-logger is to log the JWT.

  const jwtLogger = require('jsonwebtoken-logger');
  
  let token = 'your.jwt.token.here';
  jwtLogger.log(token);

2. Verifying a JWT

Verify the integrity and validity of the token.

  const jwtLogger = require('jsonwebtoken-logger');
  const secret = 'your-secret-key';
  
  jwtLogger.verify(token, secret, (err, decoded) => {
    if (err) {
      console.log('Token verification failed:', err);
    } else {
      console.log('Token decoded:', decoded);
    }
  });

3. Decoding a JWT without Validation

Decode the token to inspect its contents without verification.

  const jwtLogger = require('jsonwebtoken-logger');
  
  let decoded = jwtLogger.decode(token);
  console.log('Token decoded:', decoded);

Application Example

To demonstrate how the jsonwebtoken-logger can be integrated within an application, let’s build a simple Express.js server that logs and verifies JWTs.

  const express = require('express');
  const jwtLogger = require('jsonwebtoken-logger');

  const app = express();
  const secret = 'your-secret-key';

  app.use(express.json());

  app.post('/login', (req, res) => {
    const token = jwtLogger.sign({ user: 'John Doe' }, secret);
    res.json({ token });
  });

  app.get('/protected', (req, res) => {
    const token = req.headers['authorization'];
    
    jwtLogger.verify(token, secret, (err, decoded) => {
      if (err) {
        return res.status(401).send('Unauthorized access');
      }
      res.status(200).send('Protected data');
    });
  });

  app.listen(3000, () => {
    console.log('Server is running on port 3000');
  });

In this example, we’ve created a simple server with routes for logging in and accessing protected data. The server uses the jsonwebtoken-logger to handle token generation, logging, and verification.

Integrating the jsonwebtoken-logger in your application not only strengthens security but also aids in tracking and debugging JWTs more effectively.

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