Fix “Uncaught ReferenceError: require is not defined” in Javascript

Uncaught ReferenceError require is not defined

In this article, we’ll discuss how to fix uncaught referenceerror: require is not defined javascript.

When importing a module in JavaScript, you may get an error message “Uncaught ReferenceError: require is not defined”.

Your JavaScript environment may not be able to handle the call to the require() method that you created in your code, resulting in this error. This error can be caused by several different things.

  • Using the require() function in a browser that does not support RequireJS
  • Using the Node.js require() function with the type: module specified in your package.
  • Instead of having .js extension, your JavaScript file has .mjs extension.

This guide will assist you in resolving the issue.

Let’s examine how to resolve the mistake from the browser first.

Fix “require is not defined” in a Browser

If you are using the Node.js environment, you can use the JavaScript require() function by default.

In other words, the browser won’t understand what you’re trying to accomplish when you use require() in your code.

However, require() is not required because programs naturally load all the <script> documents you added to your HTML record.

For instance, assume you have a lib.js document with the accompanying code.

Add it to your HTML file in the following order:

A program load all your <script> labels through and through.

After a <script> label has been stacked, you can call its code from any place beyond it.

Server-side conditions like Node don’t have the <script> tag, so it needs the require() capability.

Use ESM import/ export syntax

If you are working in a browser environment and need a syntax that is comparable to need, you can use the syntax for ESM import and export.

Chrome, Safari, and Firefox are examples of modern browsers that support import/export syntax within a script that uses a type module.

Fix “require is not defined” on server-side

When you need to load a package or module into the JavaScript file that you are working on, you will utilize the need() function.

For instance, the following is the procedure for loading lodash from Node:

However, even though you are running the code through Node, the require is not defined issue may still appear as a result of the options you have chosen.

The following is the error that was recorded on the console:

Referenceerror: require is not defined

If this occurs to you, the first thing that you should do is inspect the package.json file.

Check to see if your JSON file includes a type: module definition

.js files are treated as ES modules when the module type is specified in Node. It’s better to use the import/export syntax rather than require() in this case!

Remove the “type”: “module” from your package to fix the problem.

The problem persists if you do not use the.js extension for your JavaScript files.

There are two JavaScript extensions that can be used with Node: .mjs and .cjs.

With these add-ons, a file is run by Node as an ES Module or as a CommonJS Module, respectively.

You cannot use require to load the module when it ends in .mjs(). Make sure you use the.js extension to avoid this problem.

Final Thoughts

We have provided some guidelines on how to deal with Javascript errors, such as “uncaught referenceerror: require is not defined,” in the article you just read. Read on, and select the strategy that best fits your needs. You can refer to ITtutoria right away if you’re having any problems because they have detailed guides on such solutions. Thank you very much for reading!

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