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Create and deploy an HTTP Cloud Function by using Node.js (1st gen)

This guide takes you through the process of writing a Cloud Function using the Node.js runtime. There are two types of Cloud Functions:

An HTTP function, which you invoke from standard HTTP requests.
An event-driven function, which you use to handle events from your Cloud infrastructure, such as messages on a Pub/Sub topic, or changes in a Cloud Storage bucket.

The sample shows how to create a simple HTTP function.

Before you begin

Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

Go to project selector

Make sure that billing is enabled for your Google Cloud project.

Enable the Cloud Functions and Cloud Build APIs.

Enable the APIs

In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

Go to project selector

Make sure that billing is enabled for your Google Cloud project.

Enable the Cloud Functions and Cloud Build APIs.

Enable the APIs

Install and initialize the gcloud CLI.
Update and install gcloud components:
```
gcloud components update
```

Prepare your development environment.
Go to the Node.js setup guide

Create a function

Create a directory on your local system for the function code:

Linux or Mac OS X

mkdir ~/helloworld
cd ~/helloworld

Windows

mkdir %HOMEPATH%\helloworld
cd %HOMEPATH%\helloworld

Create an index.js file in the helloworld directory with the following contents:

const functions = require('@google-cloud/functions-framework');
const escapeHtml = require('escape-html');

/**
 * Responds to an HTTP request using data from the request body parsed according
 * to the "content-type" header.
 *
 * @param {Object} req Cloud Function request context.
 * @param {Object} res Cloud Function response context.
 */
functions.http('helloHttp', (req, res) => {
  res.send(`Hello ${escapeHtml(req.query.name || req.body.name || 'World')}!`);
});

This example function takes a name supplied in the HTTP request and returns a greeting, or "Hello World!" when no name is supplied.

Specify dependencies

Dependencies in Node.js are stored in a file called package.json. You can create this file manually or with the npm command.

To create your package.json dependency file by using npm, run these commands:

npm init
npm install c8 gaxios mocha sinon supertest wait-port --save-dev
npm install @google-cloud/functions-framework escape-html

If you prefer to build your package.jsonfile manually, create a package.json file in the helloworld directory with the following contents:

{
  "name": "nodejs-docs-samples-functions-hello-world-http",
  "version": "0.0.1",
  "private": true,
  "license": "Apache-2.0",
  "author": "Google Inc.",
  "repository": {
    "type": "git",
    "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"
  },
  "engines": {
    "node": ">=16.0.0"
  },
  "scripts": {
    "unit-test": "c8 mocha -p -j 2 test/index.test.js test/*unit*test.js test/*integration*test.js --timeout=6000 --exit",
    "system-test": "c8 mocha -p -j 2 test/*system*test.js --timeout=600000 --exit",
    "all-test": "npm run unit-test && npm run system-test",
    "test": "npm -- run unit-test"
  },
  "dependencies": {
    "@google-cloud/functions-framework": "^3.1.0",
    "escape-html": "^1.0.3"
  },
  "devDependencies": {
    "c8": "^8.0.0",
    "gaxios": "^6.0.0",
    "mocha": "^10.0.0",
    "sinon": "^16.0.0",
    "supertest": "^6.0.0",
    "wait-port": "^1.0.4"
  }
}

Deploy the function

To deploy the function with an HTTP trigger, run the following command in the helloworld directory:

gcloud functions deploy helloHttp --runtime nodejs20 --trigger-http --allow-unauthenticated

The --allow-unauthenticated flag lets you reach the function without authentication. To require authentication, omit the flag.

Test the function

When the function finishes deploying, take note of the httpsTrigger.url property or find it using the following command:
```
gcloud functions describe helloHttp
```
It should look like this:
```
https://GCP_REGION-PROJECT_ID.cloudfunctions.net/helloHttp
```
Visit this URL in your browser. You should see a "Hello World!" message.

Try passing a name in the HTTP request, for example by using the following URL:
```
https://GCP_REGION-PROJECT_ID.cloudfunctions.net/helloHttp?name=NAME
```
You should see the message "Hello NAME!"

View logs

Logs for Cloud Functions are viewable using the Google Cloud CLI, and in the Cloud Logging UI.

Use the command-line tool

To view logs for your function with the gcloud CLI, use the logs read command, followed by the name of the function:

gcloud functions logs read helloHttp

The output should resemble the following:

LEVEL  NAME       EXECUTION_ID  TIME_UTC                 LOG
D      helloHttp  rvb9j0axfclb  2019-09-18 22:06:25.983  Function execution started
D      helloHttp  rvb9j0axfclb  2019-09-18 22:06:26.001  Function execution took 19 ms, finished with status code: 200

Use the Logging dashboard

You can also view logs for Cloud Functions from the Google Cloud console.