Implement File Upload Endpoint (multer)

Express.js

Node.js

Technical Specification

Create a POST /upload endpoint that accepts a single file field 'file' and stores it in an uploads/ folder.

Input/Output Samples

Input:POST /upload with image

Output:{ originalName, filename }

Optimal Logic Path

const multer = require("multer");
const upload = multer({ dest: "uploads/" });

app.post("/upload", upload.single("file"), (req, res) => {
  res.json({
    originalName: req.file.originalname,
    filename: req.file.filename,
  });
});

Architectural Deep-Dive

multer parses multipart/form-data and places file info on req.file.