Can You Add Arbitrary Fields to JSON Encoding in Go Using MarshalJSON()?

How to Add Arbitrary Fields to JSON Encoding in Go Using MarshalJSON()

Problem:

When encoding a struct using json.Marshal(), you may encounter the need to include additional fields in the JSON output that are not part of the struct's definition. This can be useful for scenarios where you need to add metadata or contextual information to the JSON payload.

Question:

Is it possible to utilize the MarshalJSON() method to incorporate arbitrary fields into the JSON representation of a struct?

Answer:

Yes, you can use MarshalJSON() to add arbitrary fields to a JSON encoding in Go. This method allows you to customize the JSON representation of your struct, providing greater control over the output.

Implementation:

You can create a custom MarshalJSON() method for your struct that constructs a new struct with the additional fields and then marshals it to JSON:

type Book struct {

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