How to read a json file in Python programming language

Python provides a built-in JSON library that allows developers to decode and encode JSON data effortlessly. This makes it easy for programs to exchange data in a standardized format. In this tutorial, we will discuss how to read a JSON file in Python using the standard library and other third-party libraries, and how to manipulate the data in a meaningful way. By the end of this tutorial, you will be able to read a JSON file with Python and use the data to power your applications.

Opening and Reading JSON Files in Python :

• In order to read a JSON file in Python, you can use the built-in  json  module.
• The  json  module provides a  load()  method to read data from a JSON file.
• Code Sample : 

import json

with open("example.json", "r") as f:
   data = json.load(f)
   
print(data)

Accessing Values from JSON Data :

• Once you have loaded the JSON data into Python, you can access its values through standard Python methods.
• Use the key names to access specific values in the JSON data.
• Code Sample : 

import json

with open("example.json", "r") as f:
   data = json.load(f)
   
print(data["name"])
print(data["age"])
print(data["subjects"][0])

Working with Nested JSON Data

• JSON data can be nested with key/value pairs or arrays within key/value pairs.
• To access nested values, use multiple keys in succession with brackets to navigate to the desired value.
• Code Sample : 

import json

with open("example.json", "r") as f:
   data = json.load(f)
   
print(data["address"]["city"])
print(data["grades"][1]["marks"][2])

Handling Errors when Reading JSON Files

• Errors can occur when reading and parsing JSON files in Python, such as invalid syntax or missing keys.
• You can use error handling to gracefully handle these errors.
• Use a try-except statement with the   JSONDecodeError  exception to handle decoding errors.
• Code Sample : 

import json

try:
   with open("example.json", "r") as f:
       data = json.load(f)
except json.JSONDecodeError as e:
   print(f"JSON decoding error: {e}")