GeezerVison

index.html

<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="Cache-Control" content="no-cache">
  <title>REST Server</title>
  <style>
    body {
      font-family: Arial, Helvetica, sans-serif;
    }

    th {
      text-align: left;
    }

    td {
      padding-right: 2em;
    }
  </style>
</head>

<body>
  <h1>REST Server</h1>

  <table>
    <tr>
      <th>Method</th>
      <th>URL</th>
      <th>Body</th>
      <th>Returns</th>
    </tr>
    <tr>
      <td>GET</td>
      <td>/records</td>
      <td></td>
      <td>[{record}, {record}, ...]</td>
    </tr>
    <tr>
      <td>GET</td>
      <td>/records/1</td>
      <td></td>
      <td>{record}</td>
    </tr>
    <tr>
      <td>POST</td>
      <td>/records</td>
      <td>{record}</td>
      <td>{record}</td>
    </tr>
    <tr>
      <td>PUT</td>
      <td>/records/1</td>
      <td>{record}</td>
      <td>{record}</td>
    </tr>
    <tr>
      <td>DELETE</td>
      <td>/records/1</td>
      <td></td>
      <td>{record}</td>
    </tr>
  </table>
</body>

</html>

server.js

// This program uses Node.js and Express.js to create a simple REST API.
//
// References:
//   https://medium.com/@onejohi/building-a-simple-rest-api-with-nodejs-and-express-da6273ed7ca9

"use strict";

const express = require("express");
const server = express();

const cors = require('cors')
server.use(cors());

const bodyParser = require('body-parser');
server.use(bodyParser.json());

let records = [];
let lastID = 0;

server.get("/", (request, response, next) => {
  const path = require('path');
  let filename = path.join(__dirname, "index.html");
  response.sendFile(filename);
});

server.get("/records", (request, response, next) => {
  response.send(JSON.stringify(records, null, 2));
});

server.get("/records/:id", (request, response, next) => {
  let index = records.findIndex(record => record.id == request.params.id);
  if (index == -1) {
    response.status(404);
    response.send("Not found");
  }
  else {
    response.send(JSON.stringify(records[index], null, 2));
  }
});

server.post("/records", (request, response, next) => {
  let record = request.body;
  record["id"] = ++lastID;
  records.push(record);
  response.status(201);
  response.send(JSON.stringify(record, null, 2));
});

server.put("/records/:id", (request, response, next) => {
  let index = records.findIndex(record => record.id == request.params.id);
  if (index == -1) {
    response.status(404);
    response.send("Not found");
  } else {
    let record = request.body;
    record["id"] = request.params.id;
    records[index] = record;
    response.send(JSON.stringify(record, null, 2));
  }
});

server.delete("/records/:id", (request, response, next) => {
  let index = records.findIndex(record => record.id == request.params.id);
  if (index == -1) {
    response.status(404);
    response.send("Not found");
  } else {
    let record = records.splice(index, 1);
    response.send(JSON.stringify(record, null, 2));
  }
});

server.listen(3000, () => {
  console.log("Server running on port 3000");
});