jsonwalk.Walk walks arbitrary JSON nodes, unmarshalled with the standard library json.Unmarshall call, which can be any single value supported by JSON: null, bool, string, number, array or object. It aims a quick analysis of the input and extracting of the needed data.

For a library that implements JSON searching & JSON modification, consider gjson and sjson.

Internally the JSON types are mapped as following:

• Nil - null in JSON terminology
• Bool - boolean
• String - string
• Float64 - number
• Array - array
• Map - object

For every discovered node it calls provided callback, which is accepted in a form of the WalkCallback interface.

The callback receives the discovered key, value and node type as jsonwalk.NodeValueType for any logic to be preformed based on the already known type assertion.

Map keys, as always, will be discovered in an unpredictable order so if any action depends on the order of such values, it should be made in a separate Walk.

Quick example of printing a JSON structure with values:

var f interface{}
err := json.Unmarshal([]byte(src), &f)
if err != nil {
	return // deal with error
}
jsonwalk.Walk(&f, jsonwalk.Print{})

This built-in Print{} struct returns an implementation of the WalkCallback. To quickly provide a custom callback there's a Callback wrapper that accepts the callback function.

Look into examples folder for inspiration.