flip.js

(function (exports) {

    exports.flip = function (json) {

        function findAllCoordinates(obj) {
            var objects = [];
            for (var i in obj) {
                if (i === "coordinates") {
                    objects.push(obj[i]);
                } else if (typeof obj[i] == 'object') {
                    objects = objects.concat(
                        findAllCoordinates(obj[i])
                    );
                }
            }
            return objects;
        }

        function flipAllCoordinatesArray(coordinates) {
            if (coordinates && coordinates.length === 2 && typeof coordinates[0] === 'number') {
                coordinates.reverse();
            } else {
                for (var p = 0; p < coordinates.length; p++) {
                    flipAllCoordinatesArray(coordinates[p]);
                }
            }
        }

        var values = findAllCoordinates(json);

        for (var i = 0; i < values.length; i++) {
            flipAllCoordinatesArray(values[i]);
        }

        return json;
    }

})(typeof exports === 'undefined' ? this['geojson-flip'] = {} : exports);