Error: Error: Cannot Find Module "nodemailer"

What's Causing This Error?

This error occurs when you have not installed the nodemailer library in your Node.js application.

Solution - Here's How To Resolve It

First, ensure that you have created a Node.js project to resolve the error. If you do not have a project, run the command npm init to initialize a Node.js project that creates an empty package.json file.

Afterward, install the nodemailer library using the command shown below.

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npm install nodemailer --save

Please note that your Node.js version must be v6.0 or greater to install Nodemailer.

After executing the npm command, your package.json will have the dependency added to it, as shown below.

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{
    "dependencies": { 
        "nodemailer" : "^6.7.5"
    }
}

Afterward, you can re-execute the Node.js file and see that the error has been resolved.