You are watching: Referenceerror: fetch is not defined
As you may have noticed, fetch doesn’t work in Node.js. If you attempt to use it you get an error like the below one
(node:21368) UnhandledPromiseRejectionWarning: ReferenceError: fetch is not defined at createObj(C:\source\scratch\api-caller.js:58:28) at Object. (C:\source\scratch\api-caller.js:108:1) at Module._compile (internal/modules/cjs/loader.js:1137:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10) at Module.load (internal/modules/cjs/loader.js:985:32) at Function.Module._load (internal/modules/cjs/loader.js:878:14) at Function.executeUserEntryPoint as runMain at internal/main/run_main_module.js:17:47 (node:21368) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1) (node:21368)
There are quite a few different modules available, I’m tending to use node-fetch as it more resembles the native fetch is ES6. The node-fetch package is pretty lightweight and is quite a bit smaller than axios.
So, how do we use node-fetch then?
We need to install the node package using npm or yarn. I prefer to use npm as it works well enough for me (and it comes with Node on Windows!) To install it, I simply need to type the following command into the terminal
npm i node-fetch
It will run for a moment or two and then show results like the below image
Using the library inside of our code is actually pretty easy. For the most part, I just require it at the top of my modules and I’m good to go.
"use strict"const fetch = require("node-fetch")
Wrapping it UpFor now, Node.js doesn’t implement fetch. Hopefully, some day it is added in and we no longer need to add another dependency.
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For now, I recommend using a dependency like node-fetch or looking at request or axios.