flask api
@app.route('/api/v1/users', methods=['GET'])
def get_users():
    users = [ user.json() for user in User.query.all() ] 
    return jsonify({'users': users })
@app.route('/api/v1/users/<id>', methods=['GET'])
def get_user(id):
    user = User.query.filter_by(id=id).first()
    if user is None:
        return jsonify({'message': 'User does not exists'}), 404
    return jsonify({'user': user.json() })