*Working with JSON & APIs in Python*

*What is JSON?*

JSON (JavaScript Object Notation) is a lightweight data format used for storing and exchanging data between systems (especially in web APIs).

It looks like this:


name: Alice,
age: 30,
skills: [Python, SQL]


Python treats JSON data like dictionaries and lists.

*How to Handle JSON in Python*

import json

Convert Python dict to JSON string
person = name: Alice, age: 30
json_string = json.dumps(person)
print(json_string)

Convert JSON string to Python dict
data = 'name: Bob, age: 25'
person_dict = json.loads(data)
print(person_dict[name]) Output: Bob

*What is an API?*

An API (Application Programming Interface) allows different systems to talk to each other.
You send a request → you get a response (usually in JSON).


*Making a Simple API Call (using mock data)*

import requests

response = requests.get(https://jsonplaceholder.typicode.com/users/1)
data = response.json()

print(fName: data['name'])
print(fEmail: data['email'])

This fetches data from a public fake API and prints the name and email of a user.

*Mini Project: Mock Weather App*

import requests

def get_weather():
city = input(Enter your city: )
print(fFetching weather for city...)

Mock response structure
weather_data =
Delhi: temp: 32°C, condition: Sunny,
Mumbai: temp: 28°C, condition: Rainy,


if city in weather_data:
info = weather_data[city]
print(fTemperature: info['temp'], Condition: info['condition'])
else:
print(Sorry, no data available.)

get_weather()


*What You Practiced* :

- JSON serialization/deserialization
- Making HTTP requests using requests
- Accessing and using API response data
- Mocking real-world scenarios