What does this error mean — Uncaught TypeError: Already read?

Question

In Javascript, when is this error thrown?

index.js

/**
 * Created by tushar.mathur on 24/12/15.
 */
\'use strict\'

const _         


        

Answer 1

This error means you have resolved the promise (in this case, you use Body.json()) more than once.

You can check the response body methods from the ref I attached below and you need a flag to check if the promise has been resolved or not: in this case, you can use Body.bodyUsed

Reference: https://developer.mozilla.org/en-US/docs/Web/API/Response

HTH