Supported Languages

Render natively supports Node.js / Bun, Python, Ruby, Go, Rust, and Elixir. While creating a service, just link your GitHub/GitLab/Bitbucket repo, choose the runtime for your language, and specify a branch to deploy.

Plus, you can use virtually any programming language if you deploy your code as a Docker image.

Set your language version

By default, each Render runtime uses a recent, actively supported version of its associated language (listed in the table below).

However, we still recommend setting a language version for your service. Doing so helps you ensure consistent behavior between Render and your other environments (such as development).

See the table to learn how to set your language version:

Language	Default Version*	How to Set a Version
Node.js	`20.12.2`	Set the `NODE_VERSION` environment variable, or add a `.node-version` file to your project root containing only the version number: `21.1.0` For additional options, see Setting Your Node.js Version.
Bun	`1.1.0`	Set the `BUN_VERSION` environment variable: `1.1.0`
Python	`3.11.9`	Set the `PYTHON_VERSION` environment variable. For details, see Setting Your Python Version.
Ruby	`3.3.1`	Set the `ruby` directive in your `Gemfile`, or add a `.ruby-version` file to your project root containing only the version number: `3.1.4` For details, see Setting Your Ruby Version.
Go	`1.22`	Render’s native Go environment always uses the latest stable Go `1.x` version. You can’t set a different version unless you deploy a docker image.
Rust	`stable`	Set the `RUSTUP_TOOLCHAIN` environment variable, or add a `rust-toolchain` file to your project root containing only the toolchain version: `beta` For details, see Specifying a Rust Toolchain.
Elixir	`1.16.1`	Set the `ELIXIR_VERSION` and/or `ERLANG_VERSION` environment variables. If you don’t set `ERLANG_VERSION`, Render automatically uses an Erlang version that’s compatible with your `ELIXIR_VERSION`. For details, see Setting Your Elixir and Erlang Versions.
Other languages	N/A	To use any language besides those listed above, deploy your code as a Docker image.

*Render updates the default version for each language over time.

With the exception of Go and Rust, a particular service’s default language version depends on when that service was first created. For details, see the version documentation for your language (linked from the table above).

Docker support

When you deploy a Docker image on Render, it can use virtually any programming language and framework. This is true regardless of whether you:

Build your image on Render, or
Pull a prebuilt image from your container registry.

Learn more about Docker versus native runtimes.