require is not defined javascript – how to fix require is not defined error?

require is not defined javascript Problem : require() is not a feature that is built into the browser. The require function is defined only in node js and it has nothing to do with the browser. Typically require() is used in server side NodeJS code

require is not defined javascript – uncaught referenceerror: require is not defined

require() is not a feature that is built into the browser. Manytimes, (js require is not defined or require is not defined js) JavaScript may suddenly give you a require is not defined error like this:

uncaught referenceerror: require is not defined

Uncaught ReferenceError: require is not defined

uncaught referenceerror require is not defined

This usually happens because your JavaScript environment doesn’t understand how to handle the require() function reference. The require() function is only available by default on Node.js environment.

If you required to use it on the browser like this (Google Chrome, Mozilla Firefox, Safari Web Browser or many more), you required to add the require() function to the browser like this (Google Chrome, Mozilla Firefox, Safari Web Browser or many more) by using the RequireJS library.

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here solution of the “require is not defined javascript”.

Using RequireJS on your HTML file.

To add RequireJS to your project, you required to download the latest RequireJS release and put it in your scripts/ directory.

Next, you required to call the script on your main HTML header as follows:

<!DOCTYPE html>
<html>
  <head>
    <title>javascript require is not defined - www.pakainfo.com</title>
    <script data-main="scripts/main" src="scripts/require.js"></script>
  </head>
  <body>
    <h2 id="header">First Project On JavaScript</h2>
  </body>
</html>

Also Read : require is not defined

The data-main attribute is a special attribute that’s used by RequireJS to load a specific script right after RequireJS is loaded. In the case of above, scripts/main.js file will be loaded.

Inside of main.js, you can load any scripts you required to use in your project. Suppose you required to include the Lodash library in your file. You first required to download the script from the website, after that include the lodash.js script in the scripts/ directory.

Your require Aplication project structure should look as follows:

├── index.html
└── scripts
    ├── main.js
    ├── lodash.js
    └── require.js

Now all you required to do is use requirejs main function to load lodash, after that pass it to the callback function.

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Take a look at the following example:

requirejs(["lodash"], function (lodash) {
  const getHeadPart = document.getElementById("header");
  getHeadPart.textContent = lodash.upperCase("welcome to Pakainfo");
});

In the source code above, RequireJS will load lodash library. after that Once its loaded, the HTML h2 element will be selected, as well as the textContent will be replaced with “welcome to Pakainfo” text, transformed to uppercase by lodash.uppercase() call.

You can wait until the whole DOM is loaded before loading scripts by listening to DOMContentLoaded event as follows:

document.addEventListener("DOMContentLoaded", function () {
  requirejs(["lodash"], function (lodash) {
    const getHeadPart = document.getElementById("header");
    getHeadPart.textContent = lodash.upperCase("welcome to Pakainfo");
  });
});

Finally, you may also remove the data-main attribute as well as add the script tag right at the end of the HTML DOM body tag as follows:

<!DOCTYPE html>
<html>
  <head>
    <title>javascript require is not defined - www.pakainfo.com</title>
    <script src="scripts/require.js"></script>
  </head>
  <body>
    <h2 id="header">First Project On JavaScript</h2>
    <script>
      document.addEventListener("DOMContentLoaded", function () {
        requirejs(["scripts/lodash"], function (lodash) {
          const getHeadPart = document.getElementById("header");
          getHeadPart.textContent = lodash.upperCase("welcome to Pakainfo");
        });
      });
    </script>
  </body>
</html>

Also you can Feel free to structure your custom directory and file script as you see fit.

And that’s best answer for “require is not defined javascript”. how you can use RequireJS to add require() function to the browser like this (Google Chrome, Mozilla Firefox, Safari Web Browser or many more). And then You can free download an example full source code on this requirejs-starter repository on GitHub.