Build a Json Object in Python

JSON (JavaScript Object Notation) is a lightweight data-interchange format widely used for data exchange between a server and a web application, as well as between different components of a system. In Python, working with JSON is straightforward, and the built-in json module provides functions to encode and decode JSON data. In this article, we’ll explore how to create and build JSON objects in Python.

Build a JSON Object in Python

Below are some of the ways by which we can build a JSON object in Python:

• Using Python Dictionary
• Using json.loads( )
• Using json.JSONEncoder

Build a JSON Object Using Python Dictionary

JSON module is imported to deal with JSON objects. A Python dictionary named ‘data’ is used to store the object in key-value pairs. json.dumps( ) is used convert the Python dictionary into JSON formatted string and result is displayed.

Python3

import json

data = {
    "name": "Guru",
    "age": 19,
    "isStudent": True
}

json_string = json.dumps(data)
print(type(json_string))
print(json_string)

Output

<class 'str'>
{"name": "Guru", "age": 19, "isStudent": true}

Build a JSON Object Using json.loads( ):

In this example, the json.loads() function is used to parse a JSON-formatted string json_string into a Python dictionary named data. The resulting dictionary is then printed, representing the decoded JSON data.

Python3

import json

json_string = '{"name": "GFG", "age": 19, "isStudent": true}'

data = json.loads(json_string)
print(type(json_string))

print(data)

Output

<class 'str'>
{'name': 'GFG', 'age': 19, 'isStudent': True}

Build a JSON Object Using json.JSONEncoder:

Encoder function is defined that’s used for encoding sets and converting to list. A json object named ‘gfg’ is created as a set. This list is converted into a dictionary named ‘json_data’. The dictionary is converted into o a JSON string json_string using json.dumps() with the custom encoder ‘Encoder’.

Python3

import json

def encoder(obj):
    if isinstance(obj, set):
        return list(obj)
    return obj

gfg = [('name', 'Hustlers'), ('age', 19), ('is_student', True)]
json_data = dict(gfg)

json_string = json.dumps(json_data, default=encoder)
print(type(json_string))

print(json_string)

Output

<class 'str'>
{"name": "Hustlers", "age": 19, "is_student": true}