nodejs read file sent in the request without saving to file system

To read a file sent in the request without saving it to the file system in Node.js, you can follow these steps:

1. Use the multer middleware to handle the file upload in the request.
2. Access the file data using the req.file object provided by multer.
3. Use the fs module to read the file data directly from memory, without saving it to the file system.

Here's an example of how you can achieve this:

const express = require('express');
const multer  = require('multer');
const upload = multer({ dest: 'uploads/' });
const fs = require('fs');

const app = express();

app.post('/upload', upload.single('file'), (req, res) => {
  // Access the file data from memory
  const fileData = req.file.buffer;

  // Process the file data as needed
  // For example, you can convert it to a string
  const fileContent = fileData.toString('utf8');

  // Use the file content as required
  console.log(fileContent);

  // Send a response
  res.send('File processed successfully');
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

In this example, the multer middleware is used to handle the file upload, and the file data is accessed from memory using req.file.buffer. The file content is then processed without saving it to the file system, and a response is sent to the client.