Just as JSON is just a formalization of existing JavaScript object syntax, GeoJSON is a formalized syntax of JSON objects, optimized for storing geodata. All GeoJSON object are JSON objects, and all JSON objects are JavaScript objects.

var geodata = {
    "type": "FeatureCollection",
    "features": [
            "type": "Feature",
            "geometry": {
                "type": "Point",
                "coordinates": [ 150.1282427, -24.471803 ]
            "properties": {
                "type": "town"

Confusingly, longitude is always listed before latitude. Get used to thinking in terms of lon/lat instead of lat/lon.