Simple route to expose all of an API's routes and basic information in a Flask app

app.py

import inspect


def is_json_responder(responder_fn):
    """Helper function to check if a function is a JSON responder. Uses
    inspect to get the source code and identifies the last line being a
    jsonify call
    """
    lines = [_ for _ in inspect.getsource(responder_fn).split("\n") if _]
    return "jsonify({" in lines[-1]

@APP.route("/")
@cross_origin()
def root_view():
    """
    API route handler for root. Returns a list of application routes
    for DevX. Skips "/" and "/static". Uses a inspect based helper to isolate only
    methods that respond with a jsonify call
    """
    _globals = globals()
    skip_methods = ("HEAD", "OPTIONS")
    response = {}
    app_root = "http://{host}:{port}".format(**CONFIG.get("app"))
    for item in APP.url_map.iter_rules():
        if item.rule == "/" or "static" in item.rule:
            continue
        handler = _globals.get(item.endpoint)
        if not is_json_responder(handler):
            continue
        response.update({
            item.endpoint: {
                "description": handler.__doc__,
                "methods": ", ".join((_ for _ in item.methods if _ not in skip_methods)),
                "uri": "{}{}".format(app_root, item.rule)
            }
        })
    return jsonify(response)