How to write a JSON file?¶

The builtin json module converts Python dictionaries to JSON and back. The JavaScript Object Notation (JSON) is frequently used to send structured data around the web or store it painlessly in files. The json modules utilizes the similarity of the JSON format to Python dictionaries.

import json

data = {"apples": 1, "bananas": "two", "cherries": [3,4,5]}
with open("data.json", "w") as f:
     jj = json.dumps(data)
     f.write(jj)

Note

You could write to the file directly with json.dump.

How to read a JSON file?¶

Loading a JSON data structure from a file results in a list or dictionary:

with open("data.json") as f:
    data = json.loads(f.read())
print(data)

Instead of parsing a string object, you could parse from the file directly with json.load()