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How to Build a REST API with Node.js & Express

In this tutorial we're going to take a look at how easy it is to build a simple REST API using Node.js and the Express framework. This API is going to allow users to post comments to a web server, as well as retrieve a comment once posted.

Video Tutorial

Source Code

You can find the source code for this video below. Alternatively, browse it on GitHub.

index.js
const fs = require("fs/promises");
const express = require("express");
const cors = require("cors");
const _ = require("lodash");
const { v4: uuid } = require("uuid");

const app = express();

app.use(express.json());
app.use(express.cors());

app.get("/outfit", (req, res) => {
	const tops = ["Black", "White", "Orange", "Navy"];
	const jeans = ["Grey", "Dark Grey", "Black", "Navy"];
	const shoes = ["White", "Grey", "Black"];

	res.json({
		top: _.sample(tops),
		jeans: _.sample(jeans),
		shoes: _.sample(shoes)
	});
});

app.get("/comments/:id", async (req, res) => {
	const id = req.params.id;
	let content;

	try {
		content = await fs.readFile(`data/comments/${id}.txt`, "utf-8");
	} catch (err) {
		return res.sendStatus(404);
	}

	res.json({
		content: content
	});
});

app.post("/comments", async (req, res) => {
	const id = uuid();
	const content = req.body.content;

	if (!content) {
		return res.sendStatus(400);
	}

	await fs.mkdir("data/comments", { recursive: true });
	await fs.writeFile(`data/comments/${id}.txt`, content);

	res.status(201).json({
		id: id
	});
});

app.listen(3000, () => console.log("API Server is running..."));
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package.json
{
  "name": "api",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node index.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "cors": "^2.8.5",
    "express": "^4.18.1",
    "lodash": "^4.17.21",
    "uuid": "^8.3.2"
  }
}

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