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Python JSON Data Handling (Read/Write)

In Python, the built-in json module is used to process JSON data. You can read JSON from files or strings and write Python objects to JSON files or strings.

Reading JSON Data from a File

import json

# Open JSON file in read mode
with open('data.json', 'r', encoding='utf-8') as f:
    # Convert JSON data from file to Python object (usually dict)
    data = json.load(f)

print(data)
  

Writing JSON Data to a File

import json

# Python dictionary to save as JSON
data_to_save = {
    "name": "John Doe",
    "age": 30,
    "city": "Seoul"
}

# Open JSON file in write mode
with open('output.json', 'w', encoding='utf-8') as f:
    # Convert dict to JSON and write to file
    json.dump(data_to_save, f, ensure_ascii=False, indent=4)

print("JSON file has been successfully saved.")
  

Reading JSON from a String

import json

# JSON string
json_string = '{"name": "Chris Kim", "age": 25, "city": "Busan"}'

# Convert JSON string to Python dictionary
data = json.loads(json_string)

print(data['name'])  # "Chris Kim"
print(data['age'])   # 25
  

Converting Python Object to JSON String

import json

# Python dictionary
python_dict = {
    "product": "Laptop",
    "price": 1200000,
    "in_stock": True
}

# Convert Python dict to JSON string
json_output = json.dumps(python_dict, ensure_ascii=False, indent=2)

print(json_output)
# Output:
# {
#   "product": "Laptop",
#   "price": 1200000,
#   "in_stock": true
# }
  

Key Points

• json.load(): Read JSON from a file and convert it to a Python object.
• json.loads(): Read JSON from a string.
• json.dump(): Write Python object to a JSON file.
• json.dumps(): Convert Python object to a JSON string.
• ensure_ascii=False: Preserves non-ASCII characters.
• indent: Formats JSON output with indentation for readability.

SEO Keywords

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These methods allow you to efficiently read and write JSON data in Python, whether from files or strings, while preserving character encoding and formatting.