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

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To check if token expired using this JWT library in Node.js, we get the expiration timestamp and compare it to the current date and time.

For instance, we write

const isTokenExpired = (token) =>
  Date.now() >= JSON.parse(atob(token.split(".")[1])).exp * 1000;

to get the token’s expiration timestamp in milliseconds with

JSON.parse(atob(token.split(".")[1])).exp * 1000

Then we compare it to the current timestamp returned by Date.now.

If the current timestamp is bigger than the token’s timestamp, then the token expired.

By John Au-Yeung