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heroku logoheroku-buildpack-nodejs

Heroku's buildpack for Node.js applications.

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Quick Overview

The heroku/heroku-buildpack-nodejs repository is an official Heroku buildpack for Node.js applications. It provides the necessary tools and configurations to deploy Node.js applications on the Heroku platform, automating the process of setting up the runtime environment, installing dependencies, and preparing the application for execution.

Pros

  • Seamless integration with Heroku's deployment pipeline
  • Automatic detection and installation of Node.js version and npm/Yarn dependencies
  • Support for multiple package managers (npm, Yarn, pnpm)
  • Built-in caching mechanisms to speed up subsequent builds

Cons

  • Limited customization options compared to manual setup
  • May not support all cutting-edge Node.js features immediately
  • Potential conflicts with complex project structures or non-standard configurations
  • Dependency on Heroku's infrastructure and pricing model

Getting Started

To use this buildpack with your Node.js application on Heroku:

  1. Ensure your project has a valid package.json file.
  2. Create a new Heroku app:
    heroku create my-nodejs-app
    
  3. Set the buildpack for your app:
    heroku buildpacks:set heroku/nodejs
    
  4. Deploy your application:
    git push heroku main
    

The buildpack will automatically detect your Node.js version, install dependencies, and start your application based on the scripts defined in your package.json.

For more advanced configurations, you can create a Procfile in your project root to specify custom run commands:

web: node server.js

You can also use environment variables to fine-tune the buildpack behavior:

heroku config:set NPM_CONFIG_PRODUCTION=false

This example disables production mode for npm, which can be useful for installing development dependencies.

Competitor Comparisons

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The React Framework

Pros of Next.js

  • Offers a more comprehensive full-stack React framework with built-in routing and server-side rendering
  • Provides better performance optimization features like automatic code splitting and image optimization
  • Supports static site generation and incremental static regeneration

Cons of Next.js

  • Has a steeper learning curve due to its more complex architecture and features
  • May be overkill for simple applications that don't require server-side rendering or static generation
  • Requires more configuration and setup compared to a basic Node.js application

Code Comparison

Next.js routing:

// pages/index.js
export default function Home() {
  return <h1>Welcome to Next.js!</h1>
}

Node.js with Express routing:

// app.js
const express = require('express');
const app = express();

app.get('/', (req, res) => {
  res.send('<h1>Welcome to Express!</h1>');
});

While heroku-buildpack-nodejs is a buildpack for deploying Node.js applications on Heroku, Next.js is a full-fledged React framework. The buildpack focuses on providing a smooth deployment experience for Node.js apps, whereas Next.js offers a complete development and production environment with additional features like server-side rendering and static site generation.

106,466

Node.js JavaScript runtime ✨🐢🚀✨

Pros of Node

  • Core Node.js runtime with extensive features and APIs
  • Highly customizable and extensible for various use cases
  • Active community with frequent updates and improvements

Cons of Node

  • Requires more setup and configuration for deployment
  • Not optimized specifically for Heroku platform
  • May need additional tools for production deployment

Code Comparison

Node:

const http = require('http');

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('Hello World\n');
});

server.listen(8080);

Heroku Buildpack NodeJS:

{
  "name": "node-example",
  "version": "0.0.1",
  "engines": {
    "node": "14.x"
  },
  "scripts": {
    "start": "node index.js"
  }
}

The Node repository contains the core Node.js runtime, while the Heroku Buildpack NodeJS is specifically designed to deploy Node.js applications on Heroku. The Node code example shows a basic HTTP server setup, whereas the Heroku Buildpack example demonstrates a package.json configuration for Heroku deployment.

Set up a modern web app by running one command.

Pros of create-react-app

  • Provides a complete, pre-configured development environment for React applications
  • Offers a streamlined, zero-configuration setup process for beginners
  • Includes built-in testing tools and optimized production builds

Cons of create-react-app

  • Less flexible for advanced configurations compared to custom setups
  • May include unnecessary dependencies for simpler projects
  • Requires ejecting to access and modify the underlying configuration

Code Comparison

create-react-app:

npx create-react-app my-app
cd my-app
npm start

heroku-buildpack-nodejs:

heroku create
git push heroku main
heroku open

Key Differences

  • Purpose: create-react-app is focused on React application development, while heroku-buildpack-nodejs is a Heroku buildpack for Node.js applications
  • Scope: create-react-app provides a complete development environment, whereas heroku-buildpack-nodejs is primarily for deployment on Heroku
  • Customization: heroku-buildpack-nodejs offers more flexibility for configuring Node.js environments, while create-react-app abstracts many configuration details

Use Cases

  • Use create-react-app for quickly starting new React projects with a standardized setup
  • Use heroku-buildpack-nodejs when deploying Node.js applications to Heroku, regardless of the frontend framework
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Pros of Nest

  • Full-featured framework for building scalable server-side applications
  • Built-in support for TypeScript and decorators
  • Modular architecture promoting code reusability and maintainability

Cons of Nest

  • Steeper learning curve due to its comprehensive nature
  • Potentially overkill for simple applications or microservices
  • Heavier footprint compared to lightweight Node.js setups

Code Comparison

Nest (main.ts):

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  await app.listen(3000);
}
bootstrap();

Heroku Buildpack Node.js (Procfile):

web: node server.js

The Nest code snippet demonstrates the framework's entry point, showcasing its modular structure and TypeScript integration. In contrast, the Heroku Buildpack Node.js example is a simple Procfile command to start a Node.js server.

Nest provides a more structured approach to building applications, while Heroku Buildpack Node.js focuses on deployment and runtime configuration for Node.js applications on the Heroku platform. Nest offers a comprehensive framework for building complex applications, whereas Heroku Buildpack Node.js is tailored for seamless deployment of Node.js apps to Heroku's infrastructure.

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Fast, unopinionated, minimalist web framework for node.

Pros of Express

  • Flexible and minimalist web application framework for Node.js
  • Large ecosystem with extensive middleware and plugins
  • Highly customizable and suitable for various types of web applications

Cons of Express

  • Requires more setup and configuration compared to the Heroku buildpack
  • May need additional tools and libraries for full-stack development
  • Steeper learning curve for beginners

Code Comparison

Express:

const express = require('express');
const app = express();

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.listen(3000, () => console.log('Server running on port 3000'));

Heroku Buildpack Node.js:

{
  "name": "node-example",
  "version": "1.0.0",
  "engines": {
    "node": "14.x"
  },
  "scripts": {
    "start": "node index.js"
  }
}

Key Differences

  • Express is a web application framework, while Heroku Buildpack Node.js is a deployment tool
  • Express focuses on server-side logic and routing, whereas the buildpack handles Node.js app deployment on Heroku
  • Express requires manual setup of the server and routes, while the buildpack automates the deployment process

Use Cases

  • Express: Building custom web applications, APIs, and server-side rendering
  • Heroku Buildpack Node.js: Deploying Node.js applications to Heroku's platform with minimal configuration
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A modern runtime for JavaScript and TypeScript.

Pros of Deno

  • Built-in TypeScript support without additional configuration
  • Improved security with explicit permissions for file, network, and environment access
  • Simplified dependency management without a package.json file

Cons of Deno

  • Smaller ecosystem compared to Node.js, with fewer available packages
  • Limited compatibility with existing Node.js projects and libraries
  • Steeper learning curve for developers familiar with Node.js

Code Comparison

Deno:

import { serve } from "https://deno.land/std@0.140.0/http/server.ts";

serve((req) => new Response("Hello, World!"));

heroku-buildpack-nodejs (Node.js):

const http = require('http');

http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('Hello, World!');
}).listen(8080);

The Deno example showcases its ability to import modules directly from URLs and its more concise syntax for creating a simple HTTP server. The Node.js example demonstrates the traditional approach using the built-in http module and callback-based server creation.

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README

Heroku Buildpack for Node.js

nodejs

This is the official Heroku buildpack for Node.js apps.

CI

Documentation

For more information about using this Node.js buildpack on Heroku, see these Dev Center articles:

For more general information about buildpacks on Heroku:

Using the Heroku Node.js buildpack

It's suggested that you use the latest version of the release buildpack. You can set it using the heroku-cli.

heroku buildpacks:set heroku/nodejs

Your builds will always used the latest published release of the buildpack.

If you need to use the git url, you can use the latest tag to make sure you always have the latest release. The main branch will always have the latest buildpack updates, but it does not correspond with a numbered release.

heroku buildpacks:set https://github.com/heroku/heroku-buildpack-nodejs#latest -a my-app

Locking to a buildpack version

Even though it's suggested to use the latest release, you may want to lock dependencies - including buildpacks - to a specific version.

First, find the version you want from the list of buildpack versions. Then, specify that version with buildpacks:set:

heroku buildpacks:set https://github.com/heroku/heroku-buildpack-nodejs#v176 -a my-app

Chain Node with multiple buildpacks

This buildpack automatically exports node, npm, and any node_modules binaries into the $PATH for easy use in subsequent buildpacks.

Feedback

Having trouble? Dig it? Feature request?

Development

Prerequisites

For local development, you may need the following tools:

Deploying an app with a fork or branch

To make changes to this buildpack, fork it on GitHub. Push up changes to your fork, then create a new Heroku app to test it, or configure an existing app to use your buildpack:

# Create a new Heroku app that uses your buildpack
heroku create --buildpack <your-github-url>

# Configure an existing Heroku app to use your buildpack
heroku buildpacks:set <your-github-url>

# You can also use a git branch!
heroku buildpacks:set <your-github-url>#your-branch

Downloading Plugins

In order to download the latest plugins that have been released, run the following:

plugin/download.sh v$VERSION

Make sure the version is in the format v#, ie. v7.

Tests

The buildpack tests use Docker to simulate Heroku's stacks.

To run the test suite:

make test

Or to just test a specific stack:

make heroku-20-build
make heroku-22-build

The tests are run via the vendored shunit2 test framework.

Debugging

To display the logged build outputs to assist with debugging, use the "echo" and "cat" commands. For example:

test() {
  local log_file var

  var="testtest"
  log_file=$(mktemp)
  echo "this is the log file" > "$log_file"
  echo "test log file" >> "$log_file"

  # use `echo` and `cat` for printing variables and reading files respectively
  echo $var
  cat $log_file

  # some cases when debugging is necessary
  assertEquals "$var" "testtest"
  assertFileContains "test log file" "$log_file"
}

Running the test above would produce:

testtest
this is the log file
test log file

The test output writes to $STD_OUT, so you can use cat $STD_OUT to read output.