Configuring the Runtime for Vercel Functions

The runtime of your function determines the environment in which your function will execute. Vercel supports various runtimes including Node.js, Python, Ruby, and Go. You can also configure other runtimes using the file. Here's how to set up each:

By default, a function with no additional configuration will be deployed as a Vercel Function on the Node.js runtime.

For Go, expose a single HTTP handler from a file within an directory at your project's root. For example:

For Python, create a function by adding the following code to :

For Ruby, define an HTTP handler from files within an directory at your project's root. Ruby files must have one of the following variables defined:

• proc that matches the signature
• class that inherits from the class

For example:

Don't forget to define your dependencies inside a :

You can configure other runtimes by using the property in your file. For example:

In this case, the function at would use the custom runtime specified.

For more information, see Community runtimes