index.js

const express = require("express");
const app = express();
const dotenv = require("dotenv");
const mongoose = require("mongoose");
const authRoute = require("./routes/auth");
const userRoute = require("./routes/users");
const postRoute = require("./routes/posts");
const categoryRoute = require("./routes/categories");
const multer = require("multer");


dotenv.config();
app.use(express.json());

mongoose.set("strictQuery", false);
mongoose.connect(process.env.MONGO_URL).then(
     console.log("Connected to mongoDB")
     ).catch(err=> console.log(err));

const storage = multer.diskStorage({
     destination:(req,file,cb) => {
          cb(null, "images")
     }, filename:(req, file, cb) => {
          cb(null, req.body.name)
     }
})  

// storing the image locally under images folder
const upload = multer({storage: storage});
app.post("/api/upload", upload.single("file"), (req, res) => {
     res.status(200).json("File has been uploaded")
});

app.use("/api/auth", authRoute);
app.use("/api/users", userRoute);
app.use("/api/posts", postRoute);
app.use("/api/categories", categoryRoute);

app.listen("3000", () =>{
     console.log("Backend is running.");
});