Building API Routes with Quart
In this blog post, we’ll go over how to use the Quart library in Python to create API endpoints. Quart is a Python ASGI web microframework whose API is a superset of the Flask API, meaning that you can use Flask-like syntax and patterns with Quart.
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from quart import Quart, request, jsonify, make_response
app = Quart(__name__)
@app.route('/api/test', methods=['GET'])
async def test_route():
return jsonify({"message": "This is a test route"}), 200
app.run()
User Registration and Login
Here are examples of routes for user registration and login, which handle HTTP POST requests and use the async/await syntax.
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@app.route('/user/register', methods=['POST'])
async def register():
data = await request.get_json()
username = data.get('username')
password = data.get('password')
# Registration logic goes here...
return jsonify({"message": f"User {username} registered successfully"}), 200
@app.route('/user/login', methods=['POST'])
async def login():
data = await request.get_json()
username = data.get('username')
password = data.get('password')
# Login logic goes here...
return jsonify({"message": "Login successful"}), 200
Error Handling
You can also return error responses with appropriate HTTP status codes. Below is an example of error handling for a missing parameter.
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@app.route('/user/login', methods=['POST'])
async def login():
data = await request.get_json()
username = data.get('username')
password = data.get('password')
if not username or not password:
return jsonify({"error": "Missing username or password"}), 400
# Rest of the login logic goes here...
return jsonify({"message": "Login successful"}), 200
JSON Web Tokens (JWT)
Quart can be combined with other libraries such as PyJWT to handle JSON Web Tokens (JWT) for authentication. Here’s an example route that verifies an identity token.
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@app.route('/verifyIdentityToken', methods=['POST'])
async def verify_identity_token():
data = await request.get_json()
id_token = data.get('identity_token')
# Token verification logic goes here...
return await make_response(jsonify({'user_id': user_id, 'jwt_token': jwt_token}), 200)
That’s it for this quick look at Quart. The library is a powerful tool for building API endpoints in Python, and it is especially useful when combined with other libraries to handle things like JWT for authentication.