init repo

.gitignore

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+node_modules/

package.json

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+{
+  "name": "express-api-starter",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+      "start": "node src/index.js",
+      "dev": "nodemon src/index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^8.2.0",
+    "express": "^4.17.1",
+    "helmet": "^4.1.0",
+    "morgan": "^1.10.0"
+  },
+  "devDependencies": {
+    "nodemon": "^2.0.4"
+  }
+}

src/.env.example

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+NODE_ENV=development
+PORT=5000

src/api/index.js

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+const express = require('express')
+
+const router = express.Router()
+
+router.get('/', (req, res) => {
+    res.json({
+        message: 'API!'
+    })
+})
+
+module.exports = router

src/app.js

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+const express = require('express')
+const morgan = require('morgan')
+const helmet = require('helmet')
+const cors = require('cors')
+
+require('dotenv').config()
+
+const middlewares = require('./middlewares')
+const api = require('./api')
+
+const app = express()
+
+app.use(morgan('dev'))
+app.use(helmet())
+app.use(cors())
+
+app.get('/', (req, res) => {
+    res.json({
+        message: 'Hello!'
+    })
+})
+
+app.use('/api/v1', api)
+app.use(middlewares.notFound)
+app.use(middlewares.errorHandler)
+
+module.exports = app

src/index.js

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+const app = require('./app')
+
+const port = process.env.PORT || 5000;
+
+app.listen(port, () => {
+    console.log(`Listening: http://localhost:${port}`)
+})

src/middlewares.js

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+function notFound(req, res, next) {
+    res.status(404);
+    const error = new Error(`Not Found - ${req.originalUrl}`)
+    next(error)
+}
+
+function errorHandler(err, req, res, next) {
+    const statusCode = res.statusCode !== 200 ? res.statusCode : 500
+    res.status(statusCode)
+    res.json({
+        message: err.message,
+        stack: process.env.NODE_ENV === 'production' ? '' : err.stack
+    })
+}
+
+module.exports = {
+    notFound,
+    errorHandler
+}