Node.js is detected when you have a package.json file in your project. All dependencies found in packages.json are installed with either NPM, Yarn, PNPM, or Bun (depending on the lockfile detected).

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Start Command

You can specify a custom start command in your package.json file, for example:

{
	"scripts": {
		"start": "node index.js"
	}
}

If not specified, then the start command will be inferred based on the environment. Read more on the Nixpacks documentation.

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Versions

Hop supports the following Node.js versions out of the box:

• 18
• 16 (default)
• 14

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Specifying a version

The version can be overridden by:

• Setting the NIXPACKS_NODE_VERSION environment variable, or
• Specifying the engines.node field in package.json