Services
Technology Web App Development Mobile App Development Windows App Development Database Development UI/UX Development Cloud Development SEO Digital Marketing Guest Posting Content Writing Artificial Intelligence Data Science ERP Development CRM Development CMS Development LMS Development Business Listing Blockchain Technology Startup Promotion AI Tools Integration
Products
Data Converter Cleaner TUC - Unit Converter Import Export Survey Manager Tweet Controller
Developer
Article Blog Forum Interview Beginner News Startup Quiz
Users
Career
Apply Job Internship
Pricing
Login Sign Up Get a Quote

forum

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

Student

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 .

Message

1 Answers

Anubhav Sharma
Anubhav Sharma 30 Nov 2025
Report Abuse

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"
}
MindStick Training
Markdown for AI

A clean, structured version of this page for AI assistants and LLMs.

Open .md