app.js

const express = require("express");
const fetch = require("node-fetch");
require("dotenv").config();

//express server
const app = express();

//server port number
const PORT = process.env.PORT || 3000;


//set template engine
app.set("view engine", "ejs");
app.use(express.static("public"));

//needed to parse html data for POST request
app.use(express.urlencoded({
    extended: true
}))
app.use(express.json());

app.get("/", (req, res) => {
    res.render("index")
})

app.post("/convert-mp3", async (req, res) => {
    const videoId = req.body.videoID;
    if(
        videoId === undefined || 
        videoId === "" || 
        videoId === null
    ){
        return res.render("index", {success: false, message: "Please enter a video ID"});
    }else{
        const fetchAPI = await fetch(`https://youtube-mp36.p.rapidapi.com/dl?id=${videoId}`, {
           "method" : "GET",
           "headers" : {
            "x-rapidapi-key" : process.env.API_KEY,
            "x-rapidapi-host" : process.env.API_HOST
           } 
        });

        const fetchResponse = await fetchAPI.json();

        if(fetchResponse.status === "ok")
            return res.render("index", {success: true, song_title: fetchResponse.title, song_link: fetchResponse.link});
        else
            return res.render("index", {success: false, message : fetchResponse.msg})
    }
    //console.log(videoId);
})

//start the server
app.listen(PORT, () => {
    console.log(`Server started on port ${PORT}`);
})