How to validate JSON structure (not validation)?

Question

JavaScript

When a JSON response arrives from the server, how can you efficiently check its structure? Those. does it have all the required fields, given the hierarchical structures?

Answer 1

Parse and check like any object

Answer 2

Look towards JSON Schema, it seems like it was invented for this ball (http://ru.wikipedia.org/wiki/JSON#JSON_Schema, json-schema.org/ ).

Answer 3

As a starting point:

JSON.isOfPattern = function(json, props){
  if (json == null) return false;
  for(var key in props){
    if (key in json == false) return false;
    if (typeof props == 'object' && !JSON.isOfPattern(json[key],props[key])) return false;
  }
  return true;
}

var json = { name: 'A', address: { city: 'Berlin'}};
JSON.isOfPattern(json, {name:null, address: {city: null} });

Answer 4

If you're sure the JSON came from the right server, why validate it?