Thread by @Rapid_API

Building an API is not difficult as it sounds.

Let's create a quick number API using which we can fetch even, odd, and prime numbers.

Thread 🧵👇🏻

Prerequisite:

We are assuming you have Node.js installed on your machine. If you haven't installed it, click on the following link and install it simply.

nodejs.org/en/

Let's start with creating an empty directory and initializing the project by running the following command.

The next step is to create an empty JavaScript file (File name could be anything, in this case, it's index.js) and install Express.

🔗 npmjs.com/package/express

Express is a minimal and easy-to-learn framework for Node.

Now that everything is ready, let's require express to initialize the app and start the local server at port 3000.

For more context, the listen() function establishes the connection on a specified host or port.

It takes two params:

- The first is the port number or host.

- The second (optional) is a callback function that runs after listening to a specified host or value.

It's not recommended that you use the browser to build or debug APIs due to security reasons.

We prefer Paw, a full-featured HTTP client.

Go ahead and download it.

🔗 Paw.cloud

Let's create the first endpoint for even numbers.

We will be making a GET request to a particular route and it should return all the even numbers present in the database.

For demo purposes, we have a hard-coded array instead of any database.

But you can fetch data dynamically from any DB.

The `get` method allows us to create HTTP GET requests.

It accepts two params:

- The first is path/route.

- The second is a callback function that handles the request to the specified route.

The callback function itself accepts two arguments:

- The first is the request which is the data to the server.

- The second is the response which is the data to the client.

We want the server to return all the even numbers when the client access the "/evens" endpoint.

Here's how we can do it. 👇🏻

In the above code snippet, `numbers` is nothing but a hard-coded array containing numbers from 1 to 20.

You fetch data from any database as well.

Perfect!

Let's restart the server by running the `node index.js` command and see what we are getting in the Paw.

As you can see in the above screenshot we are getting all the even numbers present in the database (numbers array).

Using the same technique, we can create as many endpoints as we want.

Let's quickly create the endpoint for getting odd and prime numbers as well.

Check out the below code snippet for the "/odds" endpoint.

Similarly, we can create an endpoint for fetching prime numbers.

You can build excellent APIs and publish them on RapidAPI Hub.

rapidapi.com/learn/hub/prov…

RapidAPI makes your API accessible to over 3 million developers and gives you the option to make passive income.

And with that being said, we hope you like this thread.

Follow @Rapid_API to keep up with the great API-related content. 💙🐙