Specifying a Node Version

By default, Render uses the latest LTS version of Node. You can customize this for your app in one of three ways, in order of precedence:

Add an environment variable called NODE_VERSION to your app and set the value to a valid version, for example 12.16.1.
Add a file called .node-version at the root of your repo. This file should contain a single line containing the full semantic Node version you’d like to use.

Your .node-version should look like this:
```
12.16.1
```
This is only used if you haven’t set NODE_VERSION already.
Alternatively, you can specify a Node version in the engines directive in your package.json. This can be an exact version like 10.17.0 or a range like >=10.11 <10.18.

This is the relevant snippet from a sample package.json:
```
  "engines": {
    "node": ">=12 <13"
  }
```
This is only used if you haven’t set NODE_VERSION or added a .node-version file to the root of your repo.