How to Handle Dynamic JSON Field Tags in Go?

Dynamic JSON Field Tags in Go

When generating JSON for Terraform files, you may encounter dynamic field names like resource names and AWS instance names. These names are not known at compile time, making it challenging to use Go's field tags for marshalling.

To overcome this, consider using a map instead:

type Resource struct {
    AWSInstance map[string]AWSInstance `json:"aws_instance"`
}

type AWSInstance struct {
    AMI string `json:"ami"`
    Count int `json:"count"`
    SourceDestCheck bool `json:"source_dest_check"`
}

With a map, you can assign dynamic field names to map keys and insert values into the map to construct the JSON payload dynamically. For example:

r := Resource{
    AWSInstance: map[string]AWSInstance{
        "web1": AWSInstance{
            AMI:   "qdx",
            Count: 2,
        },
    },
}

This approach allows you to handle variable JSON keys and generate custom JSON payloads with dynamic field names in Go.

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