Traverse all the Nodes of a JSON Object Tree with JavaScript

Question

I\'d like to traverse a JSON object tree, but cannot find any library for that. It doesn\'t seem difficult but it feels like reinventing the wheel.

In XML there are

Answer 1

var test = {
    depth00: {
        depth10: 'string'
        , depth11: 11
        , depth12: {
            depth20:'string'
            , depth21:21
        }
        , depth13: [
            {
                depth22:'2201'
                , depth23:'2301'
            }
            , {
                depth22:'2202'
                , depth23:'2302'
            }
        ]
    }
    ,depth01: {
        depth10: 'string'
        , depth11: 11
        , depth12: {
            depth20:'string'
            , depth21:21
        }
        , depth13: [
            {
                depth22:'2201'
                , depth23:'2301'
            }
            , {
                depth22:'2202'
                , depth23:'2302'
            }
        ]
    }
    , depth02: 'string'
    , dpeth03: 3
};


function traverse(result, obj, preKey) {
    if(!obj) return [];
    if (typeof obj == 'object') {
        for(var key in obj) {
            traverse(result, obj[key], (preKey || '') + (preKey ? '[' +  key + ']' : key))
        }
    } else {
        result.push({
            key: (preKey || '')
            , val: obj
        });
    }
    return result;
}

document.getElementById('textarea').value = JSON.stringify(traverse([], test), null, 2);