JWT: Argument of type 'string | undefined' is not assignable to parameter of type 'Secret'

Issue

I’m using dotenv to declare JWT_SECRET env variable and It’s showing the error mentioned in title.

.env

NODE_ENV="development"
JWT_SECRET="mySecretString"

environment.d.ts

import { Secret } from 'jwt-promisify'

declare global {
    namespace NodeJS {
        interface ProcessEnv {
            JWT_SECRET: Secret,
            NODE_ENV: 'development' | 'production',
            PORT?: number | string
        }
    }
}

export {}

I’m using in my routes file im signing token with JWT_SECRET

route.ts

const token = await jwt.sign({ id: newUser.id }, process.env.JWT_SECRET)

Here intellisense is working but when I run the app or compile it the error appears.

error

error TS2345: Argument of type 'string | undefined' is not assignable to parameter of type 'Secret'.
  Type 'undefined' is not assignable to type 'Secret'.

32         const token = await jwt.sign({ id: newUser.id }, process.env.JWT_SECRET)
                                                            ~~~~~~~~~~~~~~~~~~~~~~

Solution

  jwt.sign(data, process.env.SIGNATURE_KEY as string, {
        expiresIn: '30d',
        algorithm: "HS256"
    }, (err, encoded)=>{
        err ? reject(err) : resolve(encoded)
    })

For Typescript, I think Type casting works. I also didn’t implement async-await because the sign method wasn’t hinted as a Promise. But I guess it works too!

Answered By – Devmaleeq

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