What is the process for importing the TokenExpiredError that is thrown by the verify function in jsonwebtoken?

Question

What is the process for importing the TokenExpiredError that is thrown by the verify function in jsonwebtoken?

Is there a way to determine if an Error object thrown by the jwt.verify function in the jsonwebtoken library is of type TokenExpiredError using Typescript's instanceof? For example:

import jwt from "jsonwebtoken";

function someFunction() {
    try {
        return jwt.verify(token, key);
    }catch(err) {
        if(err instanceof TokenExpiredError) {
            return attemptRenewal()
        }
        throw err
    }
}

What is the correct way to import the TokenExpiredError symbol?

I have looked for documentation on this class but could not find any. My initial approach was:

import { jwt, TokenExpiredError } from "jsonwebtoken";

However, this resulted in jwt being undefined.

While I am aware of workarounds like comparing string names of classes, I prefer cleaner code solutions.

My version of jsonwebtoken is 8.5.1.

javascript typescript jwt

Answer 1

Answer №1

When facing a similar question, I conducted a brief search and test which led me to the following solution:

import * as jwt from "jsonwebtoken";

function myFunction() {
    try {
        return jwt.verify(token, key);
    }catch(error) {
        if(error instanceof jwt.TokenExpiredError) {
            return attemptRenewal()
        }
        throw error
    }
}

The TokenExpiredError is already included in the jwt package.

Answer 2

When facing a similar question, I conducted a brief search and test which led me to the following solution:

import * as jwt from "jsonwebtoken";

function myFunction() {
    try {
        return jwt.verify(token, key);
    }catch(error) {
        if(error instanceof jwt.TokenExpiredError) {
            return attemptRenewal()
        }
        throw error
    }
}

The TokenExpiredError is already included in the jwt package.

Answer 3

Answer №2

jsonwebtoken exports a default object structure as seen below: source

module.exports = {
  decode: require('./decode'),
  verify: require('./verify'),
  sign: require('./sign'),
  JsonWebTokenError: require('./lib/JsonWebTokenError'),
  NotBeforeError: require('./lib/NotBeforeError'),
  TokenExpiredError: require('./lib/TokenExpiredError'),
};

When you use the syntax import jwt from "jsonwebtoken";, the variable jwt will be an object containing all properties of the default export.

It is not possible to use

import { jwt, TokenExpiredError } from "jsonwebtoken";

because the default export object does not include a property named jwt,

If you want to import TokenExpiredError along with the default object, you can do so using this syntax:

import jwt, {TokenExpiredError} from "jsonwebtoken";

, where jwt remains the default export object and you also have access to the TokenExpiredError object (jwt.TokenExpiredError and TokenExpiredError are equivalent).

If your intention is to only utilize the verify function and the TokenExpiredError, your import line should look like this:

import {TokenExpiredError, verify} from "jsonwebtoken";

. Then your function would appear as follows:

import {TokenExpiredError, verify} from "jsonwebtoken";

function someFunction() {
  try {
    return verify(token, key);
  } catch (err) {
    if (err instanceof TokenExpiredError) {
      return attemptRenewal();
    }
    throw err;
  }
}

Answer 4

jsonwebtoken exports a default object structure as seen below: source

module.exports = {
  decode: require('./decode'),
  verify: require('./verify'),
  sign: require('./sign'),
  JsonWebTokenError: require('./lib/JsonWebTokenError'),
  NotBeforeError: require('./lib/NotBeforeError'),
  TokenExpiredError: require('./lib/TokenExpiredError'),
};

When you use the syntax import jwt from "jsonwebtoken";, the variable jwt will be an object containing all properties of the default export.

It is not possible to use

import { jwt, TokenExpiredError } from "jsonwebtoken";

because the default export object does not include a property named jwt,

If you want to import TokenExpiredError along with the default object, you can do so using this syntax:

import jwt, {TokenExpiredError} from "jsonwebtoken";

, where jwt remains the default export object and you also have access to the TokenExpiredError object (jwt.TokenExpiredError and TokenExpiredError are equivalent).

If your intention is to only utilize the verify function and the TokenExpiredError, your import line should look like this:

import {TokenExpiredError, verify} from "jsonwebtoken";

. Then your function would appear as follows:

import {TokenExpiredError, verify} from "jsonwebtoken";

function someFunction() {
  try {
    return verify(token, key);
  } catch (err) {
    if (err instanceof TokenExpiredError) {
      return attemptRenewal();
    }
    throw err;
  }
}

Answer 5

Answer №3

const tokenUtil = require('jsonwebtoken');

Answer 6

const tokenUtil = require('jsonwebtoken');

What is the process for importing the TokenExpiredError that is thrown by the verify function in jsonwebtoken?

Answer №1

Answer №2

Answer №3

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