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Node.js Quick Start

This document describes how to create a Node.js application from scratch and deploy it to a CloudBase HTTP cloud function.

Prerequisites​

Before you begin, ensure that you have:

  • Installed Node.js (v18 or later is recommended)
  • Have a Tencent Cloud account and have activated the CloudBase service
  • Have a basic knowledge of Node.js development

Step 1: Create the project directory​

Create a new directory named helloworld and enter the directory:

mkdir helloworld
cd helloworld

Step 2: Initialize Project Configuration​

Create a package.json file to describe project information and dependencies. You can quickly initialize the project configuration by running npm init -y.

{
  "name": "helloworld",
  "description": "Simple hello world sample in Node",
  "version": "1.0.0",
  "type": "module",
  "main": "index.js",
  "scripts": {
    "start": "node index.js"
  },
  "author": "Tencent CloudBase",
  "license": "Apache-2.0"
}

Step 3: Write the Application Code​

Create an index.js file in the same directory, which is the entry file of the application:

⚠️ Important: CloudBase HTTP cloud functions must use the default port 9000.

import { createServer } from "node:http";
import { Readable } from "node:stream";

const server = createServer(async (req, res) => {
  if (req.url.split('?')[0] === "/") {
    res.writeHead(200, { "Content-Type": "text/plain; charset=utf-8" });
    res.end("Hello World!");
  } else if (req.url.split('?')[0] === "/myip") {
    // Set CORS headers to allow cross-origin requests
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.setHeader("Content-Type", "application/json");

    try {
      // Use fetch to obtain remote data (using ipinfo.io as an example here)
      const response = await fetch("https://ipinfo.io", {
        headers: {
          Accept: "application/json",
        },
      });
      
      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }
      
      Readable.fromWeb(response.body).pipe(res);
    } catch (error) {
      console.error("Failed to obtain IP information:", error);
      res.writeHead(500, { "Content-Type": "application/json" });
      res.end(JSON.stringify({ 
        error: "Failed to fetch remote data",
        message: error.message 
      }));
    }
  } else if (req.url.split('?')[0] === "/health") {
    // Health Check Endpoint
    res.writeHead(200, { "Content-Type": "application/json" });
    res.end(JSON.stringify({ 
      status: "healthy",
      timestamp: new Date().toISOString(),
      version: "1.0.0"
    }));
  } else {
    res.writeHead(404, { "Content-Type": "application/json" });
    res.end(JSON.stringify({ error: "Not Found" }));
  }
});

const port = 9000;
const host = "0.0.0.0";
server.listen(port, host, () => {
  console.log(`Server running at http://localhost:${port}/`);
  console.log(`Try accessing http://localhost:${port}/myip to see your IP info`);
  console.log(`Health check available at http://localhost:${port}/health`);
});

This code creates a basic Web server that provides the following features:

  • Root path (/): returns "Hello World!" message
  • IP Query (/myip): obtains and returns the client's IP information
  • Health Check (/health): returns service status information
  • Error Handling: returns 404 error for unknown paths
Tip

In addition to using the native Node.js http module, you can also use the @cloudbase/functions-framework for a more streamlined development experience. For more details, see Functions Framework Quick Start.

Step 4: Create the Startup Script​

💡 Note:

  • When creating the scf_bootstrap file on windows, it is recommended to use
  • When creating the scf_bootstrap file using vscode on windows, deploying to an HTTP cloud function may result in an error: scf_bootstrap file does not exist
  • This error occurs because the script file contains Windows-style carriage returns (^M), causing Linux to fail to recognize the interpreter path correctly. This is a common issue in WSL

Create the scf_bootstrap file (with no file extension), which is the startup script for CloudBase cloud functions:

#!/bin/bash
node index.js

⚠️ Note:

  • The file name must be scf_bootstrap with no extension
  • Ensure the file has execute permissions

Grant execute permissions to the startup script:

chmod +x scf_bootstrap

Step 5: Local Testing (Optional)​

Before deployment, you can test the application locally:

node index.js

After successful testing, you can verify in the following ways:

  • Access http://localhost:9000/ to view the Hello World message
  • Access http://localhost:9000/myip to view the IP information
  • Access http://localhost:9000/health to view the health status

Press Ctrl + C to stop the local server.

Step 6: Deploy to CloudBase HTTP cloud function​

Prepare Deployment Files​

Ensure your project directory contains the following files:

helloworld/
|-- scf_bootstrap
├── package.json
└── index.js

Deploy via the console​

  1. Log in to TCB/cloud function
  2. Click "New Cloud Function"
  3. Select "HTTP cloud function"
  4. Fill in the function name (such as: helloworld)
  5. Select runtime: Node.js 18.x
  6. Select the "Local upload" method
  7. Package the project files into a zip file and upload it (Please select the files to package, not the root directory folder)
  8. Click "OK" to complete the deployment

Deploy via CLI​

For details, see Deploy HTTP function via CLI

Package the project​

If you need to package manually, you can use the following command:

# Create zip package
zip -r helloworld.zip package.json index.js scf_bootstrap

Step 7: Access Your Application​

After successful deployment, you can refer to Accessing Cloud Functions via HTTP to set up custom domain access to the

You can test in the following ways:

  • Access the root path to view the Hello World message
  • Access the /myip path to view the IP information
  • Access the /health path to check the service status

Frequently Asked Questions​

Q: Why must port 9000 be used?​

A: CloudBase HTTP cloud functions require the application to listen on port 9000, which is the standard configuration of the platform.

Q: How to view function logs?​

A: On the Cloud Functions page of the CloudBase console, click the function name to go to the details page, where you can view the runtime logs.

Q: Which Node.js versions are supported?​

A: CloudBase supports multiple Node.js versions. See Runtime Environment Support for details. It is recommended to use the LTS version.

Q: How to handle CORS cross-origin issues?​

A: Set CORS-related headers such as Access-Control-Allow-Origin in the response headers, as shown in the example code.

Q: How to handle long function cold startup times?​

A: You can reduce cold startup time by implementing a warm-up mechanism, reducing the size of dependency packages, optimizing code logic, and other methods.

Best Practices​

  1. Error Handling: Always add proper error handling for asynchronous operations.
  2. Response Header Settings: Correctly set the Content-Type and other necessary response headers.
  3. Logging: Use console.log to record key information for debugging purposes.
  4. Environment Variables: Use process.env to manage configuration information.
  5. Code Structure: For complex applications, it is recommended to use frameworks such as Express.js.

Next steps​