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In Node.js land this would be easy as return _transform(JSON.parse(json)); but I have no experience with PHP.

You just need to convert old JSON string to an object, then modify this object then return a new JSON string.

Our backend API is returning a JSON. We need to have a layer that transforms this JSON to another JSON - say with either less number of fields, or a field name change - the transformed JSON is what is returned to the end user. Basically, it is from JSON to another JSON.