How Can I Marshal Dynamic JSON Keys in Go Using Field Tags?

Marshal Dynamic JSON Field Tags in Go: Overcoming the Challenges

When dealing with JSON data in Go, marshalling is often preferred over manually constructing JSON strings. This holds true for the Terraform JSON format used to express infrastructure configurations. However, a common challenge arises when encountering dynamic JSON keys, such as the random "web1" name in the provided example.

The question posed is: how to handle such dynamic JSON keys using Go's field tags (e.g., json:"aws_instance")?

Limitations of Field Tags

Unfortunately, Go's field tags do not directly support dynamic keys. The provided solution attempts to use field tags to represent the static keys ("resource" and "aws_instance"), but fails to address the dynamic key "web1."

Alternative Approaches

As an alternative, the answer proposes using a map to represent the dynamic keys, allowing for values to be assigned at runtime.

In this example, AWSInstance becomes a map keyed by dynamic names (e.g., "web1"). The map can then be populated with specific values as needed.

By using a map, dynamic JSON keys can be easily handled in Go, enabling marshalling to be used effectively in scenarios where field tags are insufficient.

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