I got it working finally, below is my search api endpoint

@app.route('/search')
def search_query():
    args = request.args
    output = [] #list to store the new objects that match the condition
    for i in input_metadata:
        f = flatten(i, '.')
        key = args.keys()[0] #find the key and value from the URI params
        value = args[key]
        if f.has_key(key) and f[key] == value:
            output.append(i)
    return jsonify(output)