Deploy a Fastify App

You can find the step-by-step deployment guide here.

Application Build

Hostman uses the following environment when building a Fastify application:

• Node.js: 16, 18, 20, or 22
• npm
• yarn

The application is always built from the root of the repository, so make sure to place the package.json file there. If the file is in a subdirectory (for example, landing), you need to adjust the build command. For example:

npm run --prefix landing build

If the project includes a package.json file and uses yarn, we will run:

apt remove -y cmdtest yarn
npm install --global yarn
cd /<DIRECTORY> && yarn install --check-files

In all other cases, if the a package.json file is present:

cd /<DIRECTORY> && npm install

<DIRECTORY> is the path to the directory with package.json. In most cases, this is the root of the project.

The default start command is:

npm run start

Make sure that the start command is defined in the scripts section of your package.json. For example:

"scripts": {
  "start": "fastify start -l info app.js"
}

Troubleshooting

Deployment fails

If there are problems with deployment, first check the deployment log. You will be able to determine at what point something went wrong.

Often the problems are related to the start command. Make sure that all modules required to run the application are present in the package.json file.

Please add build instructions to your script section in package.json

The problem is that the build command accesses the package.json file, and if the value of the build directive is not specified, an error occurs.

To fix this, you need to add the necessary directives to the scripts section of the package.json file. Read more about using scripts here.