Fetch is not defined ошибка

Hello Guys, How are you all? Hope You all Are Fine. Today I am using fetch in my nodejs application and I am facing this error ReferenceError: fetch is not defined in nodejs. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How ReferenceError: fetch is not defined in nodejs Error Occurs ?

I am using fetch in my nodejs application and I am facing this error.

ReferenceError: fetch is not defined

How To Solve ReferenceError: fetch is not defined in nodejs Error ?

Solution 1: Install node-fetch

Here You need to use an external module for that, like node-fetch. Just Install it in your Node application like this. then put the line below at the top of the files where you are using the fetch API:

npm install node-fetch

const fetch = require("node-fetch");

Now you can use fetch in your nodeJs application.

Solution 2: accessible with a global scope

If it has to be accessible with a global scope

global.fetch = require("node-fetch");

This is a quick dirty fix, please try to eliminate this usage in production code.

Solution 3: Just use cross-fetch

Just use cross-fetch

npm install --save cross-fetch

Usage With promises:

import fetch from 'cross-fetch';
// Or just: import 'cross-fetch/polyfill';

fetch('//api.github.com/users/lquixada')
  .then(res => {
    if (res.status >= 400) {
      throw new Error("Bad response from server");
    }
    return res.json();
  })
  .then(user => {
    console.log(user);
  })
  .catch(err => {
    console.error(err);
  });

With async/await:

import fetch from 'cross-fetch';
// Or just: import 'cross-fetch/polyfill';

(async () => {
  try {
    const res = await fetch('//api.github.com/users/lquixada');

    if (res.status >= 400) {
      throw new Error("Bad response from server");
    }

    const user = await res.json();

    console.log(user);
  } catch (err) {
    console.error(err);
  }
})();

Summery

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

Also, Read

• SyntaxError: invalid syntax to repo init in the AOSP code.

When you ran your code, you saw the error messages: “ReferenceError: fetch is not defined“

As a result, after some research, we will present potential alternatives to programmers. Do not think too much, and let’s get going on correcting this error.

Under What Conditions Would This Issue Occur?

In general, fetch was created for one browser and converted to node.js in a third-party module that you appear to be lacking.

You may experience this issue while using fetch in the NodeJS application.

ReferenceError: fetch is not defined

You’ll need to utilize some external module, such as node-fetch, for this. Install this in the Node application, and add some lines to the head of your files that use the retrieve API.

Let’s take a closer look at stages using the three techniques listed below.

Method 1

The first way is to use the cross-fetch.

npm install --save cross-fetch

With promises, you can use this script.

import fetch from 'cross-fetch';
// Or just: import 'cross-fetch/polyfill';

fetch('//api.github.com/users/lquixada')
  .then(res => {
    if (res.status >= 400) {
      throw new Error("Bad response from server");
    }
    return res.json();
  })
  .then(user => {
    console.log(user);
  })
  .catch(err => {
    console.error(err);
  });

In the case of async/await, type this:

import fetch from 'cross-fetch';
// Or just: import 'cross-fetch/polyfill';

(async () => {
  try {
    const res = await fetch('//api.github.com/users/lquixada');

    if (res.status >= 400) {
      throw new Error("Bad response from server");
    }

    const user = await res.json();

    console.log(user);
  } catch (err) {
    console.error(err);
  }
})();

Method 2

You can use two syntaxes to address this problem.

Install this in the Node application as follows. Then add the second line

npm install node-fetch
const fetch = require("node-fetch");

Alternatively, you may add the following line at the files in which you are utilizing the retrieve API:

import fetch from "node-fetch";

Now you may implement fetch in the NodeJS application.

Method 3

Suppose it must be available on a worldwide scale. This is a fast and dirty workaround; please avoid using this in the codebase.

global.fetch = require("node-fetch");

Conclusion

In general, resolving the error “ReferenceError: fetch is not defined” is indeed not difficult.

We are confident that our answer will help you complete your project promptly. Hopefully, you’ll be able to produce even more incredible intellectual goods with nodejs.

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