Solving the require is not defined Error in Express.js

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Understanding the Problem

Example of the Problematic Code

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In this example, the require statement is leading to an error because the file is expected to be using ES Module syntax instead of CommonJS.

Solution Steps

Step 1: Rename Your Files

Change your file extension from .mjs to .js. This might seem counterintuitive since you are using ES Modules, but renaming it back to .js can help resolve the issue temporarily.

Step 2: Modify Your Command to Start the Application

You will want to run the application using the following command:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Convert to ES Module Syntax

If you prefer to use ES Module syntax, update your imports as follows:

[[See Video to Reveal this Text or Code Snippet]]

[[See Video to Reveal this Text or Code Snippet]]

Conclusion