Python JSON

JSON (JavaScript Object Notation) is a lightweight format used for storing and exchanging data. Python provides a built-in json module to work with JSON data.

Importing the JSON Module

Example

import json

Convert Python Dictionary to JSON

The dumps() method converts a Python object into a JSON string.

Syntax

json.dumps(object)

Example

import json

student = {
    "name": "John",
    "age": 20
}

result = json.dumps(student)

print(result)

Output:

{"name": "John", "age": 20}

Convert JSON to Python Dictionary

The loads() method converts a JSON string into a Python object.

Syntax

json.loads(json_string)

Example

import json

data = '{"name":"John","age":20}'

result = json.loads(data)

print(result)

Output:

{'name': 'John', 'age': 20}

Access JSON Data

Example

import json

data = '{"name":"John","age":20}'

student = json.loads(data)

print(student["name"])

Output:

John

Write JSON to a File

The dump() method writes JSON data to a file.

Example

import json

student = {
    "name": "John",
    "age": 20
}

with open("student.json", "w") as file:
    json.dump(student, file)

Read JSON from a File

The load() method reads JSON data from a file.

Example

import json

with open("student.json", "r") as file:
    data = json.load(file)

print(data)

Output:

{'name': 'John', 'age': 20}

Format JSON Output

Use the indent parameter to make JSON more readable.

Example

import json

student = {
    "name": "John",
    "age": 20
}

print(json.dumps(student, indent=4))

Output:

{
    "name": "John",
    "age": 20
}

Convert Python List to JSON

Example

import json

fruits = ["apple", "banana", "mango"]

print(json.dumps(fruits))

Output:

["apple", "banana", "mango"]

Summary

• JSON is used for data storage and data exchange.
• The json module is built into Python.
• dumps() converts Python objects to JSON strings.
• loads() converts JSON strings to Python objects.
• dump() writes JSON data to a file.
• load() reads JSON data from a file.
• The indent parameter formats JSON output for readability.