Explain the Python JSON

ICSM 237 12-Oct-2025

JSON stands for JavaScript Object Notation.
It’s a lightweight data format used for exchanging data between systems — often between a client (browser) and a server (backend).

It’s easy for humans to read and write.
It’s easy for machines to parse and generate.
It looks very similar to Python dictionaries!

Example of JSON:

{
  "name": "Anna",
  "age": 25,
  "skills": ["Python", "C#", "SQL"],
  "isDeveloper": true
}

JSON in Python

Python provides a built-in module called json to work with JSON data.

You can use it to:

Convert Python objects → JSON string
Convert JSON string → Python objects

1. Convert Python object to JSON string

Use json.dumps()

import json

data = {
    "name": "Anna",
    "age": 25,
    "skills": ["Python", "C#", "SQL"]
}

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

Output:

{"name": "Anna", "age": 25, "skills": ["Python", "C#", "SQL"]}

dumps → “dump string” (convert to JSON string)

2. Convert JSON string to Python object

Use json.loads()

import json

json_data = '{"name": "Anna", "age": 25, "skills": ["Python", "C#", "SQL"]}'

python_obj = json.loads(json_data)
print(python_obj)
print(python_obj["name"])

Output:

{'name': 'Anna', 'age': 25, 'skills': ['Python', 'C#', 'SQL']}
Anna

loads → “load string” (convert to Python object)

3. Read/Write JSON file

Write to file:

import json

data = {"name": "Anna", "age": 25}

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

Read from file:

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

dump and load are for file operations (not strings).

Supported Data Types

Python Type	JSON Type
dict	object
list, tuple	array
str	string
int, float	number
True	true
False	false
None	null

Extra Tip – Pretty Print JSON

You can make JSON output more readable using indent:

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

Output:

{
    "name": "Anna",
    "age": 25
}

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Explain the Python JSON

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JSON in Python

1. Convert Python object to JSON string

2. Convert JSON string to Python object

3. Read/Write JSON file

Supported Data Types

Extra Tip – Pretty Print JSON

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