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Firebase Creating and Deploying Cloud Function

In our previous section, we learned what are the Cloud Functions, why we use them, how these work, and different types of triggers.

Now, we will create and deploy cloud functions in Firebase. For this, we have to set up the Node.js environment to write functions, and the Firebase CLI which also requires Node.js and npm to deploy functions.

Firebase strongly recommends Node.js 8 for getting started. For installing Node.js and npm, the Node Version Manager is recommended.

Step 1:

So, we will first download the Node.js from the following site: https://nodejs.org/en/.

Firebase Creating and Deploying Cloud Function

Once the node.js is downloaded and run successfully, our next step is to install the Firebase CLI. Installing Node.js automatically install the npm command tools. After that we install the Firebase CLI through npm by running the following command on command prompt:

Firebase Creating and Deploying Cloud Function

Step 2:

Now, we will sign in and test the Firebase CLI. After installing the CLI, we must authenticate it. After that, we can confirm authentication by listing our Firebase projects.

1) We run the following command to sign into the Firebase using our Google account.

The above command connects our local machine to Firebase and grants access to our Firebase projects.

Firebase Creating and Deploying Cloud Function

When we select to allow access, we will switch to the browser to allow access to the Firebase CLI:

Firebase Creating and Deploying Cloud Function

When we click on Allow, it shows the following window:

Firebase Creating and Deploying Cloud Function
Firebase Creating and Deploying Cloud Function

2) Now, we test the CLI is properly working or not and accessing our account. This is done by listing our Firebase projects with the help of the following command:


Firebase Creating and Deploying Cloud Function

Step 3:

Now, we will create a directory on our desktop named FirebaseCloudFunction and move into this directory using the command line argument.

Firebase Creating and Deploying Cloud Function

Step 4:

Now, run the Firebase init functions command to initialize the function in the following way:

Firebase Creating and Deploying Cloud Function

It will start creating the directory structure. We will select yes and proceed further.

Firebase Creating and Deploying Cloud Function

In my case, by default, a project is already set named fir-demo-ca1c9. When you press yes, it will ask to select a project, and once you select your project, it will ask to choose your preferred language, i.e., JavaScript or TypeScript. I will choose JavaScript and proceed further.

Firebase Creating and Deploying Cloud Function

It will ask to use ESLint to catch probable bugs and enforce style. We will select, yes, and proceed.

Firebase Creating and Deploying Cloud Function

Now, it will ask to install dependencies with npm. We will select yes here also and proceed.

Firebase Creating and Deploying Cloud Function

Here, our Firebase initialization is completed, and it will have some directory structure for us. Go to our FirebaseCloudFunction directory.

Firebase Creating and Deploying Cloud Function

Step 5:

Now, open function folder and open index.json file. In this file, we write our function.

Firebase Creating and Deploying Cloud Function
Firebase Creating and Deploying Cloud Function

We write the code here.

Step 6:

Now, we will deploy function. We can deploy either one function using firebase deploy -only functions:function_name or all the function using firebase deploy.

Firebase Creating and Deploying Cloud Function

Here, functions are deployed successfully. We will go to the Firebase Console to check the function.

Firebase Creating and Deploying Cloud Function




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