How to Create a Flask RESTful API with GET and POST Requests | Flask REST API Tutorial (2025)

Want to build a **REST API** using Flask? 🚀 In this tutorial, we’ll walk you through creating a **Flask RESTful API** with **GET and POST** requests step by step. Flask makes it easy to build lightweight, scalable, and efficient APIs for web and mobile applications.

By the end of this tutorial, you'll have a fully functional **Flask API** that can **send and receive JSON data** using HTTP requests.

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## **🔹 What You’ll Learn in This Video:**
✅ Setting up Flask for API Development
✅ Creating a Flask RESTful API with `Flask` and `Flask-RESTful`
✅ Handling **GET & POST Requests**
✅ Sending & Receiving **JSON Data**
✅ Running & Testing the API with **Postman or cURL**

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## **🔹 Prerequisites**
Before starting, ensure you have:
✔️ **Flask & Flask-RESTful Installed**
✔️ **VS Code or Any Code Editor**

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## **🔹 Step-by-Step Guide**

### **1️⃣ Install Required Packages**
Open the terminal and run the following command:

```bash
# Create a project directory
mkdir flask-rest-api && cd flask-rest-api

# Create a virtual environment
python -m venv venv
source venv/bin/activate # Windows: venv\Scripts\activate

# Install Flask and Flask-RESTful
pip install flask flask-restful
```

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### **2️⃣ Create a Flask API Project**

```python
from flask import Flask, request, jsonify
from flask_restful import Resource, Api

app = Flask(__name__)
api = Api(app)

# Sample in-memory data
data = []

# Define a Resource for GET and POST
class ItemResource(Resource):
def get(self):
return jsonify({"items": data})

def post(self):
return jsonify({"message": "Item added!", "item": new_item})

# Add the resource to the API

if __name__ == "__main__":
```

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### **3️⃣ Run the Flask API Server**
Save the file and run:

```bash
```

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### **4️⃣ Test the API with GET & POST Requests**

#### **✅ GET Request (Fetch Items)**
Open a browser or Postman and visit:
It should return:
```json
{"items": []}
```

#### **✅ POST Request (Add an Item)**
Use **Postman** or cURL to send a **POST request** with JSON data:

```json
{
"name": "Laptop",
"price": 1200
}
```

**Postman Setup:**
- Select **POST**
- Go to **Body** → **raw** → **JSON**
- Paste the JSON data and hit **Send**

💡 The API will respond:
```json
{
"message": "Item added!",
"item": {
"name": "Laptop",
"price": 1200
}
}
```

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### **5️⃣ Fetch Updated Items**
Now it should return the updated list:
```json
{
"items": [
{
"name": "Laptop",
"price": 1200
}
]
}
```

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## **🔹 Who Is This Tutorial For?**
✅ Web Developers Building APIs
✅ Backend Engineers Working with REST APIs
✅ Anyone Looking to Learn API Development with Flask

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## **🔹 Resources Mentioned in This Video:**

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## **💡 Pro Tips for API Development**
✔ Use **Postman** to test API endpoints.
✔ Add **error handling** for better responses.
✔ Use a **database (MySQL, PostgreSQL, SQLite)** instead of in-memory storage.
✔ Deploy your API using **Docker, AWS, or GCP**.

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## **👍 Like, Share & Subscribe!**
If this tutorial helped you, please **LIKE, SHARE, and SUBSCRIBE** for more **Flask, Python, and Web Development** tutorials! 🚀

💬 Got questions? Drop them in the **comments** below!

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### **🔹 Hashtags:**
#Flask #API #RESTAPI #Python #WebDevelopment #Backend #FlaskTutorial #PythonAPI #APIDevelopment #FlaskRestful

Start building your Flask REST API today! 🐍🚀