How to get token expiration with `jsonwebtoken` using typescript

Question

I'm using jsonwebtoken to decode a token, and I'm trying to get the expiration date. Typescript is throwing errors regarding the exp property, and I'm not quite sure how to solve them:

import jwt from 'jsonwebtoken'

const tokenBase64 = 'ey...' /* some valid token */

const token = jwt.decode(tokenBase64)
const tokenExpirationDate = token.exp
//                                ^^^
// Property 'exp' does not exist on type 'string | object'. Property 'exp' does not exist on type 'string'.

I have installed @types/jsonwebtoken, and looked for a token type to cast token, but did not find any. Suggestions?

Using

• @types/[email protected]
• [email protected]

.tsconfig:

{
  "compilerOptions": {
    "allowJs": true,
    "baseUrl": ".",
    "jsx": "Preserve",
    "moduleResolution": "Node",
    "module": "ESNext",
    "sourceMap": true,
    "removeComments": true,
    "allowSyntheticDefaultImports": true,
    "target": "ESNext"
  }
}

Answer 1

I think import * as jwt from 'jsonwebtoken'; should work as expected.