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home / developersection / forums / how can you implement a simple rest api using flask?
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Anubhav Sharma
Anubhav Sharma

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The Anubhav portal was launched in March 2015 at the behest of the Hon'ble Prime Minister for retiring government officials to leave a record of their experiences while in Govt service .

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1 Answers

Anubhav Sharma
Anubhav Sharma 30 Nov 2025
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A clean, beginner-friendly explanation and example of how to implement a simple REST API using Flask.

1. Install Flask

pip install flask

2. Create the app structure

project/
 └── app.py

3. Basic REST API Example (CRUD)

Here is a complete working example that implements:

  • GET (read all)
  • GET by ID
  • POST (create)
  • PUT (update)
  • DELETE (remove)

app.py

from flask import Flask, jsonify, request

app = Flask(__name__)

# Fake in-memory database
books = [
    {"id": 1, "title": "Book One", "author": "Author A"},
    {"id": 2, "title": "Book Two", "author": "Author B"},
]

# GET all books
@app.route("/books", methods=["GET"])
def get_books():
    return jsonify(books)

# GET book by ID
@app.route("/books/<int:book_id>", methods=["GET"])
def get_book(book_id):
    book = next((b for b in books if b["id"] == book_id), None)
    return jsonify(book) if book else ("Not Found", 404)

# POST → Create new book
@app.route("/books", methods=["POST"])
def add_book():
    data = request.get_json()

    new_book = {
        "id": books[-1]["id"] + 1 if books else 1,
        "title": data["title"],
        "author": data["author"]
    }

    books.append(new_book)
    return jsonify(new_book), 201

# PUT → Update book
@app.route("/books/<int:book_id>", methods=["PUT"])
def update_book(book_id):
    data = request.get_json()
    book = next((b for b in books if b["id"] == book_id), None)

    if not book:
        return ("Not Found", 404)

    book["title"] = data.get("title", book["title"])
    book["author"] = data.get("author", book["author"])

    return jsonify(book)

# DELETE → Remove book
@app.route("/books/<int:book_id>", methods=["DELETE"])
def delete_book(book_id):
    global books
    books = [b for b in books if b["id"] != book_id]
    return ("Deleted", 204)

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

4. Run the API

python app.py

Flask will start at:

http://127.0.0.1:5000

Test the API using cURL or Postman

GET all

GET http://127.0.0.1:5000/books

POST

POST http://127.0.0.1:5000/books
Content-Type: application/json

{
  "title": "New Book",
  "author": "New Author"
}
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