Node.js tutorial: RESTful API on MacOs

Today we are going to teach you how to create a WebService based on the REST architecture model.

SOAP vs REST

In this website you can see the diference between this two API Styles:

SOAP vs. REST: A Look at Two Different API Styles | Upwork

REST — Representational State Transfer is an architectural model that uses the HTTP protocol for communication. There are several representations for presenting a resource, JSON is the most used.

For this article we are going to create the following four methods:

• listarUsers (GET) — list of all users
• addUser (PUT) — add user
• deleteUser (DELETE) — delete user
• : id (POST) — Details of a user

First you have to create a directory (servernode), after that we are going to create the package.json with the code:

npm init

After this step is complete we are going to install the module Express.js with the following command:

npm install express -S

usersList Method

If the module was successfully installed, let’s move on to create the usersList method. For that we will create the app.js file with the following code:

Now we save the file and execute the following code:

node app.js

On your browser put the following url:

http://localhost:8080/api/usersList

Should look like this:

addUser Method

To add a new user we have to add the following code (below the function to list the users):

deleteUser Method

To delete a user, we have to add the following code (below the function to add a user):

Id Method

To show the details of a user, we have to add the following code (below the function to delete a user):

The complete code should look like this: