Can Render provided ENVs be used to set our ENV?

We have an ENV that is synonymous with Render’s provided RENDER_EXTERNAL_URL. We could change our setup / code to use that ENV, but for the time being, I would prefer to just set our ENV to the value of the RENDER_EXTERNAL_URL. Is that possible?

Hi there,

Thanks for reaching out.

There isn’t currently any sort of dynamic environment variable interpolation features (but there are feature requests).

However, you may be able to achieve a workaround/something similar with standard bash. For example, you could add something like this before your build/start command:


This will set MY_EXTERNAL_DOMAIN to RENDER_EXTERNAL_HOSTNAMEunless MY_EXTERNAL_DOMAIN is set in your environment variables tab, which you may want to do if adding a custom domain later.

And to make that a bit tidier & tracked in code, you could create shell scripts in your repo for the build/start commands, to set the dynamic cars you need.

Hope that helps


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