articles.js

const mongoose = require("mongoose");

const articleSchema = new mongoose.Schema({
  title: {
    type: String,
    required: [true, "Title is required"]
  },
  content: {
    type: String,
    required: [true, "Content can't be blank"]
  }
});

module.exports = mongoose.model("Article", articleSchema);

index.js

const express = require("express");
const router = express.Router();
const Article = require("../models/articles");

router.get("/articles", (req, res) => {
  Article.find((err, articles) => res.json(articles));
});

router.get("/articles/:id", (req, res) => {
  Article.findById(req.params.id, (err, article) => {
    if (!article) {
      res.status(404).send("No result found");
    } else {
      res.json(article);
    }
  });
});

router.post("/articles", async (req, res) => {
  try {
    let article = new Article(req.body);
    await article.save();
    res.send(article);
  } catch (err) {
    res.status(422).send(`Adding article failed; error: ${err}`);
  }
});

router.patch("/articles/:id", async (req, res) => {
  try {
    await Article.findByIdAndUpdate(req.params.id, req.body);
    res.json("Article updated");
  } catch (err) {
    res.status(422).send(`Article update failed; ${err}`);
  }
});

router.delete("/articles/:id", (req, res) => {
  Article.findById(req.params.id, async (err, article) => {
    if (!article) {
      res.status(404).send(`Article not found; ${err}`);
    } else {
      try {
        await Article.findByIdAndRemove(req.params.id)
        res.status(200).json("Article deleted");
      } catch (err) {
        res.status(400).send(`Artice deletion failed; ${err}`)
      }
    }
  });
});

module.exports = router;

server.js

const express = require("express");
const mongoose = require("mongoose");
//const cors = require("cors");
const router = require("./routes/index");
const dotenv = require("dotenv").config({ path: `${__dirname}/.env` });
const bodyParser = require("body-parser");

const app = express();
const PORT = 3001;
const MONGO_URI = process.env.MONGO_URI;

//app.use(cors());
app.use(express.urlencoded({ extended: true }));
app.use(bodyParser.urlencoded({ extended: false }));
app.use(express.json());
app.use("/api", router);

mongoose.connect(MONGO_URI);
mongoose.connection.once("open", () => console.log("Connected to the Database"));
mongoose.connection.on("error", error => console.log(`Mongoose Connection Error: ${error}`));

app.listen(PORT, () => console.log(`Server listening on port ${PORT}`));