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How to check if token expired using the Node.js JWT library?

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Sometimes, we want to check if token expired using the Node.js JWT library.

In this article, we’ll look at how to check if token expired using the Node.js JWT library.

How to check if token expired using the Node.js JWT library?

To check if token expired using the Node.js JWT library, we can use the jwt.verify method.

For instance, we write

const jwt = require('jsonwebtoken')
const util = require('util');
const jwtVerifyAsync = util.promisify(jwt.verify);

router.use(async (req, res, next) => {
  const token = getToken(req)
  try {
    req.auth = await jwtVerifyAsync(token, req.app.get('your-secret'))
  } catch (err) {
    throw new Error(err)
  }
  next()
});

to call util.promisify to convert the jwt.verify method to a function that returns a promise and assign it to jwtVerifyAsync.

Then we call jwtVerifyAsync with the token and the token secret to check if the token is valid.

If it’s expired, then it’s considered invalid and an error will be thrown.

And when an error is thrown we use the catch block to catch it and rethrow it with throw.

Otherwise, we call next to call the next middleware.

Conclusion

To check if token expired using the Node.js JWT library, we can use the jwt.verify method.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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