How can I return a boolean from a promise?

Asked Sep 10 '20 at 14:53

Active Sep 10 '20 at 14:59

Viewed 442 times

I have a mongoose custom service which will check if token exist from db and I wanted it to return boolean however in my controller I got a promise.

token.services.js

async tokenExists(token) {
 const foundToken = await TokenModel.findOne({'token': token})

 if (foundToken) {
   return true;
 }

  return false;
}

Controller.js

 const tokenExists= this.tokenService.tokenExists(token);

 console.log('tokenExists', tokenExists);

However I got a promise instead of boolean see below. Console Output

 tokenExists Promise { <pending> }

Did I do something wrong? or is there a way for it to it?

edited Sep 10 '20 at 14:56

jonrsharpe

asked Sep 10 '20 at 14:53

blitzen12

4

`async tokenExits` <= `async` **makes** it return a Promise. – Taplar Sep 10 '20 at 14:54
1

You better read about `async/await` and the logic behind. – Jorge Fuentes González Sep 10 '20 at 14:56
1

Also small side note; `return !!foundToken` would return `true/false` without the if logic. – Taplar Sep 10 '20 at 14:58
1

When you mark a function as `async` it wraps the entire function in a promise under the hood. You will need to await the function when you call it. For example: `const tokenExists = await this.tokenService.tokenExists(token);` – Christian Bartram Sep 10 '20 at 14:59
Thanks much, I got working.. – blitzen12 Sep 10 '20 at 15:01

0 Answers0