How to Fix “Uncaught Referenceerror: require is not defined” in JavaScript

In this article, you will learn how to fix “uncaught referenceerror: require is not defined” in JavaScript which occurs when the required variable is not specified.

Programming in HTML and CSS is an interesting endeavor, but having to write in JavaScript could seem like a bit of a breeze at first—that is, until an error appears out of nowhere, and you have no idea what the next step should be.

The Javascript “require is not defined” issue is one of the most common mistakes that we as programmers encounter, and there are a variety of factors that might cause this error to occur.

This is most often the result of a JavaScript that is unable to properly manage a reference to the require() function. This feature is only available in node.js environments by default.

This issue can also be caused by the following:

• The use of the require() function in a browser
• Using the require() function in a Node.js project with the package.json file’s ‘type’ set to’module’
• Implementation of the require() method in Nod.js for files with a ‘.mjs’ extension.
• Implementation of the require() method in Nod.js for files with a ‘.mjs’ extension.
• If your inquiry is, “How can we fix this error?” So don’t worry, we’ve got this! In both the browser and the server, this error can occur. And we’ve got answers for both of your situations. Therefore, let’s get started with it right away!

Fixing Javascript “require is not defined” in a Browser

It’s not possible to use the require() function in a browser because it’s only supported by the node. Export and import syntax from the ES6 module framework will be used to fix this problem. Only browsers can use this method, and it serves as an alternative to the require() method.

The HTML code for the ES6 import/export syntax is shown below:

This syntax can be used in your.js files once it has been imported. Exporting a JavaScript function and a variable is the next step.

Import another.js file now to make use of the syntax in this file:

Now you’re ready to go! Instead of calling the require() method,’ you should use this syntax in the browser.

Fixing “require is not defined” on a Server

It’s possible that the require() function isn’t defined on your server, which would explain this problem. This problem can be fixed by renaming any files with a “.mjs” extension to “.js” and removing the “type” value if it is set to “module” in your “package.json” file.

The.json code is as follows:

If you prefer the ES6 module syntax, you may also use the import and export keywords. To transfer modules around, all you need to do is utilize the import and export keywords.

Here’s an example

The block of code that you exported can now be imported into another file and used as you see fit.

The following is an example of this:

Conclusion

You should have no further problems. You simply need to identify where the problem is occurring and then code it appropriately. You absolutely must not combine the use of the require() method and the ES6 module in any way. This is an essential point that you must have in mind at all times. You are not permitted to use more than one at a time!

If you’re looking for a descriptive solution to this error and other errors like this, you can visit ITtutoria. Each ITtutoria article builds the reader’s skills and confidence in addressing website errors.