Format prtint ob json

format

var format = function(value, indent) {
    indent = indent || 1;
    var tab = new Array(indent).join('    ');
    
    switch (typeof value) {
        case 'number':
        case 'boolean':
            return value;
            break;
        case 'string':
            return '"' + value + '"';
            break;
        case 'object':
            if (Array.isArray(value)) {
                return value.reduce(function(result, item, index) {
                    result += format(item, indent + 1);
                    
                    if (index < value.length - 1) {
                        result += ', ';
                    }
                    
                    return result;
                }, '[') + ']';
            }
            
            return Object.keys(value).reduce(function(result, name, index, array) {
                result += '    ' + tab + name + ': ' + format(value[name], indent + 1);

                if (index < array.length - 1) {
                    result += ',';
                }
                
                return result  + '\n';
            }, '{\n') + tab + '}';
    }
}