What is the process of uploading a file using NextJS and formidable?

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The process of uploading a file using NextJS and formidable involves the following steps:

1. Install both NextJS and formidable packages using npm command line interface.

2. Import the Formidable package using the require() function in the Node.js script.

3. Create a form in the frontend of the application where users can upload files.

4. Add an "onSubmit" event listener to the form that calls a function to handle the file upload.

5. In the handling function, extract the uploaded file from the form using formidable.

6. Save the file to a specified location using the Node's file system method.

7. Redirect the user to a success page or notify them of the successful upload.

Here's an example code snippet that demonstrates the process of uploading a file using NextJS and formidable:

import formidable from 'formidable';
import fs from 'fs';

export default function fileUpload(req, res) {
  const form = new formidable.IncomingForm();

  form.parse(req, (err, fields, files) => {
    const oldPath = files.file.path;
    const newPath = `./public/uploads/${files.file.name}`;

    fs.rename(oldPath, newPath, err => {
      if (err) throw err;
      res.status(200).json({ message: 'File uploaded successfully!' });
    })
  })
}

In this example, we are creating an endpoint "fileUpload" that receives a file through a form and saves it to a "public/uploads" folder. The file is extracted from the form submitted using formidable package and renamed to the specified location using the Node's file system method. Finally, a success message is sent to the user through a JSON response.