Building a Basic Todo List REST API in Node.js with Express

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01 Key concepts

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Persistence

Here is an example of using a database. To do so, the todo model has been extracted from app.js and added as a module in the models folder:

 /
  |
  | - app.js
  | - models/todo.js

Within the todo.js module, a require has been done to the sqlite3 module that enable the use of an in-memory database.

Example of use of persistence

const express = require('express');
const port = 9000;
const app = express();
const postparser = require('./middleware/postparser');
const Todo = require('./models/todo');
app.use(postparser);
app.get('/', function(request, response){
  Todo.all((err, todos) => response.status(200).json(todos));
});
app.post('/', (request, response) => {
    console.log(request.body);
    var newTodo = JSON.parse(request.body);
    Todo.add(newTodo);
    response.status(201).json();
});
app.put('/:id', (request, response) => {
  var id = request.params.id;
  var updatedTodo = JSON.parse(request.body);
  updatedTodo.id = parseInt(id);
  Todo.update(updatedTodo, (err, data) => {
    if(err)
    {
      response.status(404, 'The task is not found').send();
    } else {
    response.status(204).send(data);
  }
});
});
app.delete('/:id', (request, response) => {
  var id = parseInt(request.params.id);
  Todo.delete(id, (err) => {
    if(err){
      response.status(404).send();
    }else{
          response.status(200).send();
    }
  });
});
app.listen(port);