How can I pass a Terraform map variable to a Cloud Run function?

You can work around this limitation by serializing your map to a JSON string and then decoding it inside your function. For example, using Terraform’s jsonencode function, you can pass your map value as an environment variable:

HCLCopied
resource "google_cloud_run_v2_service" "default" {
  name     = "my-cloudrun-function"
  location = "us-central1"

  deletion_protection = false

  template {
    containers {
      image = "us-docker.pkg.dev/cloudrun/container/hello"
      
      env {
        name  = "MY_CONFIG"
        value = jsonencode(var.my_map)
      }
    }
  }
}

In your Cloud Run function code, you would then parse the JSON string back into a map. This approach maintains your Terraform variable structure while conforming to Cloud Run’s string-only environment variable requirement.

Another option might be to store the configuration in an external service like Secret Manager or Cloud Storage if the JSON string approach does not meet your needs.