How to Unmarshal JSON with Unknown Field Names in Go Using a Map?

Unmarshaling JSON with Unknown Fieldnames Using a Map

Unmarshaling JSON with unknown fieldnames poses a challenge, especially when the object structure remains consistent. This question addresses how to handle such scenarios and provides a solution using a Golang map.

Problem:

The provided JSON response from a POST request contains a field with an unknown name. The goal is to unmarshal this JSON into a struct while preserving the consistent structure of the known fields.

Solution:

Step 1: Create a Struct for the Known Fields

Define a struct named mData that represents the consistent fields in the JSON:

Step 2: Use a Map to Handle Unknown Fieldnames

Create a map called data to store the unknown fieldname as a key and an instance of mData as the value:

Step 3: Unmarshal the JSON into the Map

Utilize json.Unmarshal to bind the JSON body to the map:

Step 4: Print the Results

The map will now contain the unknown fieldname and the associated mData instance. You can access the values using the following code:

This approach allows you to unmarshal JSON with unknown fieldnames while maintaining the structure of the known fields. The output of the provided code will be:

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