Flask REST API

Introduction

Build RESTful APIs with Flask for web services and microservices.

Basic Setup

from flask import Flask, jsonify, request

app = Flask(__name__)

@app.route("/api/health")
def health():
    return jsonify({"status": "healthy"})

if __name__ == "__main__":
    app.run(debug=True)

CRUD Endpoints

items = {}

@app.route("/api/items", methods=["GET"])
def get_items():
    return jsonify(items)

@app.route("/api/items/<id>", methods=["GET"])
def get_item(id):
    return jsonify(items.get(id, {}))

@app.route("/api/items", methods=["POST"])
def create_item():
    data = request.json
    id = data.get("id")
    items[id] = data
    return jsonify(data), 201

@app.route("/api/items/<id>", methods=["PUT"])
def update_item(id):
    data = request.json
    items[id] = data
    return jsonify(data)

@app.route("/api/items/<id>", methods=["DELETE"])
def delete_item(id):
    if id in items:
        del items[id]
    return "", 204

Practice Problems

1. Create CRUD for resources
2. Add request validation
3. Implement pagination
4. Add error handling
5. Use Blueprint for organization