How to build an API in 1 minute.

To build an API with Mongoose and Express.js, you will need to follow these general steps:

Install Node.js and NPM (Node Package Manager) on your system if they are not already installed.

Create a new directory for your project and navigate to it in your terminal.

Initialize a new Node.js project by running npm init in the terminal and answering the prompts.

Install the required dependencies for the project by running npm install express mongoose.

Create a new file called server.js in your project directory and require the necessary modules at the top of the file:

const express = require('express');
const mongoose = require('mongoose');

Connect to your MongoDB database using Mongoose by calling the mongoose.connect() method, passing in the connection string and any desired options.

mongoose.connect('mongodb://localhost/mydatabase', {
  useNewUrlParser: true,
  useUnifiedTopology: true
});

Define your Mongoose schema and model for the data you will be working with. A schema defines the structure of the data and a model is used to create, read, update, and delete documents in the database.

const todoSchema = new mongoose.Schema({
  title: { type: String, required: true },
  completed: { type: Boolean, default: false }
});

const Todo = mongoose.model('Todo', todoSchema);

Create a new instance of the Express.js application and set up the routes for your API. You can use the app.get(), app.post(), app.put(), and app.delete() methods to define the HTTP methods and endpoints for your API.

const app = express();
app.get('/todos', async (req, res) => {
  const todos = await Todo.find({});
  return res.json(todos);
});
app.post('/todos', async (req, res) => {
  const { title } = req.body;
  const todo = new Todo({ title });
  await todo.save();
  return res.json(todo);
});

Start the server by calling the app.listen() method, passing in the desired port number and any other desired options.

app.listen(3000, () => {
  console.log('Server started on port 3000');
});

Run the server by running node server.js in the terminal and test your API endpoints using a tool like Postman or by making requests directly in your browser.

These are the basic steps for building an API with Mongoose and Express.js. There are many additional features and techniques you can use to customize and optimize your API, such as adding middleware, using authentication and authorization, and implementing pagination and filtering.