ReferenceError: fetch is not defined

I have this error when I compile my code in node.js, how can I fix it?

RefernceError: fetch is not defined

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This is the function I am doing, it is responsible for recovering information from a specific movie database.

function getMovieTitles(substr){  
  pageNumber=1;
  let url = 'https://jsonmock.hackerrank.com/api/movies/search/?Title=' + substr + "&page=" + pageNumber;
  fetch(url).then((resp) => resp.json()).then(function(data) {
    let movies = data.data;
    let totPages = data.total_pages;
    let sortArray = [];
    for(let i=0; i<movies.length;i++){
        sortArray.push(data.data[i].Title);
     }
    for(let i=2; i<=totPages; i++){
           let newPage = i;
           let url1 = 'https://jsonmock.hackerrank.com/api/movies/search/?Title=' + substr + "&page=" + newPage;

          fetch(url1).then(function(response) {
              var contentType = response.headers.get("content-type");
              if(contentType && contentType.indexOf("application/json") !== -1) {
                return response.json().then(function(json) {
                  //console.log(json); //uncomment this console.log to see the JSON data.

                 for(let i=0; i<json.data.length;i++){
                    sortArray.push(json.data[i].Title);
                 }

                 if(i==totPages)console.log(sortArray.sort());

                });
              } else {
                console.log("Oops, we haven't got JSON!");
              }
            });

        }
  })
  .catch(function(error) {
    console.log(error);
  });   
}

Answers:

Answer

The fetch API is not implemented in Node.

You need to use an external module for that, like node-fetch.

Install it in your Node application like this

npm i node-fetch --save

then put the line below at the top of the files where you are using the fetch API:

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

If it has to be accessible with a global scope

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

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

Answer

You can use cross-fetch from @lquixada

Platform agnostic: browsers, node or react native

Install

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);
  }
})();
Answer

For those also using typescript on node-js and are getting a ReferenceError: fetch is not defined error

npm install these packages:

    "amazon-cognito-identity-js": "3.0.11"
    "node-fetch": "^2.3.0"

Then include:

import Global = NodeJS.Global;
export interface GlobalWithCognitoFix extends Global {
    fetch: any
}
declare const global: GlobalWithCognitoFix;
global.fetch = require('node-fetch');
Answer

Best one is Axios library for fetching. use npm i --save axios for installng and use it like fetch, just write axios instead of fetch and then get response in then().

Answer

You have to use the isomorphic-fetch module to your Node project because of Node does not contain Fetch API yet. for fixing this problem run below command:

npm install --save isomorphic-fetch es6-promise

After installation use below code in your project:

import "isomorphic-fetch"

Hope this answer helps you.

Answer

Node.js hasn't implemented the fetch() method, but you can use one of the external modules of this fantastic execution environment for JavaScript.

In one of the answers above, "node-fetch" is cited and that's a good choice.

In your project folder (the directory where you have the .js scripts) install that module with the command:

npm i node-fetch --save

Then use it as a constant in the script you want to execute with Node.js, something like this:

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

Answer

This is the related github issue This bug is related to the 2.0.0 version, you can solve it by simply upgrading to version 2.1.0. You can run npm i [email protected]

Answer

The following works for me in Node.js 12.x:

npm i node-fetch;

to initialize the Dropbox instance:

var Dropbox = require("dropbox").Dropbox;
var dbx = new Dropbox({
   accessToken: <your access token>,
   fetch: require("node-fetch")    
});

to e.g. upload a content (an asynchronous method used in this case):

await dbx.filesUpload({
  contents: <your content>,
  path: <file path>
});
Answer

You should add this import in your file:

import * as fetch from 'node-fetch';

And then, run this code to add the node-fetch:

yarn add node-fetch

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