You can use the json module’s dump() function to write out the text to a JSON file. I had ChatGPT write out the code (though it took several iterations to get right and I needed to add a Save button and a confirmation message box. Also it can only save to notes.json but you can edit this if needed.)… Answer from AlSweigart on discuss.python.org
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W3Schools
w3schools.com › python › python_json.asp
Python JSON
Use the separators parameter to change the default separator: json.dumps(x, indent=4, separators=(".
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GeeksforGeeks
geeksforgeeks.org › python › reading-and-writing-json-to-a-file-in-python
Reading and Writing JSON to a File in Python - GeeksforGeeks
It takes two parameters: dictionary: ... indentation · After converting the dictionary to a JSON object, simply write it to a file using the "write" function....
Published   August 5, 2025
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W3Schools
w3schools.in › python › json
Learn How to Work with JSON Data in Python - W3Schools
In this tutorial, you have learned the basic concepts of working with JSON using Python. You can now read, parse, and write JSON data and efficiently integrate it into your Python applications.
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W3Schools
w3schools.io › file › json-python-read-write
How to read and write JSOn file in Python - w3schools
You can use json dumps method in python2 and python3 Here is an example · import json employee = [ { "id": 1, "name": "John", }, { "id": 2, "name": "Eric", }, ] with open("test.json", "w") as filehandler: json.dump(employee, filehandler) or json.dumps(employee, filehandler) `` How do you format the json content and write it into a file? you want to add `indentation` to json content into a file...
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W3Schools
w3schools.com › python › gloss_python_convert_into_JSON.asp
Python Convert From Python to JSON
If you have a Python object, you can convert it into a JSON string by using the json.dumps() method.
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CodeSignal
codesignal.com › learn › courses › hierarchical-and-structured-data-formats › lessons › constructing-objects-and-writing-to-json-files
Constructing Objects and Writing to JSON Files
It offers simple functions to convert between Python objects and JSON. To write our data to a JSON file, we'll use the json.dump() function, which serializes Python objects into JSON format and writes it to a file.
Top answer
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3348

data is a Python dictionary. It needs to be encoded as JSON before writing.

Use this for maximum compatibility (Python 2 and 3):

import json
with open('data.json', 'w') as f:
    json.dump(data, f)

On a modern system (i.e. Python 3 and UTF-8 support), you can write a nicer file using:

import json
with open('data.json', 'w', encoding='utf-8') as f:
    json.dump(data, f, ensure_ascii=False, indent=4)

See json documentation.

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347

To get utf8-encoded file as opposed to ascii-encoded in the accepted answer for Python 2 use:

import io, json
with io.open('data.txt', 'w', encoding='utf-8') as f:
  f.write(json.dumps(data, ensure_ascii=False))

The code is simpler in Python 3:

import json
with open('data.txt', 'w') as f:
  json.dump(data, f, ensure_ascii=False)

On Windows, the encoding='utf-8' argument to open is still necessary.

To avoid storing an encoded copy of the data in memory (result of dumps) and to output utf8-encoded bytestrings in both Python 2 and 3, use:

import json, codecs
with open('data.txt', 'wb') as f:
    json.dump(data, codecs.getwriter('utf-8')(f), ensure_ascii=False)

The codecs.getwriter call is redundant in Python 3 but required for Python 2


Readability and size:

The use of ensure_ascii=False gives better readability and smaller size:

>>> json.dumps({'price': '€10'})
'{"price": "\\u20ac10"}'
>>> json.dumps({'price': '€10'}, ensure_ascii=False)
'{"price": "€10"}'

>>> len(json.dumps({'абвгд': 1}))
37
>>> len(json.dumps({'абвгд': 1}, ensure_ascii=False).encode('utf8'))
17

Further improve readability by adding flags indent=4, sort_keys=True (as suggested by dinos66) to arguments of dump or dumps. This way you'll get a nicely indented sorted structure in the json file at the cost of a slightly larger file size.

Find elsewhere
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W3Schools
w3schools.com › python › gloss_python_format_json.asp
Python Format JSON
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... The example above prints a JSON string, but it is not very easy to read, with no indentations and line breaks.
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Real Python
realpython.com › python-json
Working With JSON Data in Python – Real Python
August 20, 2025 - Learn how to work with JSON data in Python using the json module. Convert, read, write, and validate JSON files and handle JSON data for APIs and storage.
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Medium
medium.com › @ryan_forrester_ › writing-json-to-a-file-in-python-a-step-by-step-guide-630584957d07
Writing JSON to a File in Python: A Step-by-Step Guide | by ryan | Medium
November 6, 2024 - JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write, and easy for machines to parse and generate. In Python, working with JSON is straightforward thanks to the built-in `json` module. This article will guide you through the process of writing JSON to a file in Python with detailed explanations and practical code examples, making it easy for novice learners to grasp the concept.
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Vertabelo Academy
academy.vertabelo.com › course › python-json › writing-json-files › writing-to-json-file › convert-a-string-into-a-json-file
How to Read and Write JSON Files in Python | Learn Python | Vertabelo Academy
Suppose we want to save our data in a file. No problem – we simply use the json.dump() function. (Note: That's dump without an "s".) This function writes the data converted to its JSON representation into a file.
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How Tos JSON
campbell-muscle-lab.github.io › howtos_json › pages › in_code › python › writing › writing.html
Writing JSON Files - How Tos JSON
# Import the json module for reading/writing JSONs. import json # Describe the file path where you would like to save the JSON file. JSON_FILE_PATH = "python_writing_demo.json" # Form the dictionary that we would like to write. Notice how close this syntax # is to the JSON structure!
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Reddit
reddit.com › r/learnpython › how would you use python to create json files?
r/learnpython on Reddit: How would you use python to create JSON files?
March 7, 2020 -

Howdy!

I recently took a coding test for an internship program, I was quickly put in check by the coding test. I am only about 50 hours into coding, but I had higher hopes for myself then how I performed.

The questions that tripped me up were how to take input in the form of a Dict [] and create a JSON object out of it. I was allowed to read documentation during the test and found the JSON library with json.dumps, but couldn't figure out how to use it in the allotted time. =^(

In the spirit of improvement would you fine folks of r/learnpython be willing to show how you would create a JSON object with python, and outline some reasons as to why you would want to create a JSON object in the first place? I'm hoping to learn something new, but I also hope that there are a few on this sub who can come across the post and learn something new too.

On the bright side, I solved FizzBuzz no problem. That problem gave me anxiety when I first started coding, and now I can solve it expertly. Little wins!

Thank you! =^)

Top answer
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5
I read two concrete questions from your post: why you would want to create a JSON object Imagine you want multiple software systems to communicate. Let's say we have three systems, one written in Python, one client written in JavaScript and one more backend system in Java. You can't just send Python objects over a network and expect the systems written in JS or Java to understand them. Same thing the other way around. In the end it's just electrical signals and both the sender and receiver need a common understanding of how to interpret those signals, otherwise they will just be gibberish. That's where data formats like JSON come into play: It's a simple and standardized data format that can be handled in any modern programming language. Now your Python code can serialize its internal representation of a piece of data into this format and send it over a network or store it on some disk, where some other system will eventually pick it up, deserialize it into its own internal representation and process it. show how you would create a JSON object with python import json data = {"year": 2020, "sales": 12345678, "currency": "€"} # creating a JSON string json_string = json.dumps(data) # storing it in a file with open("data.json", "w") as json_file: json.dump(data, json_file)
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3
If you know about the JSON library, there's not much more to tell. RealPython have excellent tutorials and information. https://realpython.com/python-json/ You can find a lot more by searching "python json tutorial".
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Board Infinity
boardinfinity.com › blog › json-file-in-python
JSON file in Python: Read and Write | Board Infinity
January 3, 2025 - Often when dealing with large amounts of JSON data you might wish to add white space in order to make diagnostics or logs more readable. The json.dumps() function is used for pretty formatting of JSON data instead of writing it in a file. ... #pretty write json file in python import json # Sample Python dictionary data = { "name": "John", "age": 30, "isStudent": False, "courses": ["Math", "Science"] } # Convert Python dictionary to JSON string with pretty formatting json_string = json.dumps(data, indent=4) # Print the formatted JSON string print(json_string)
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Reddit
reddit.com › r/learnpython › need help understanding how to write a file to json (python) without overwriting it
r/learnpython on Reddit: need help understanding how to write a file to json (python) without overwriting it
October 4, 2022 -
My Code:  Python, (Using discord rewrite if this matters)

user_id = str(ctx.message.author.id)
        print(user_id)

        # reads data
        with open("test.json", "r") as f:
            data = json.load(f)
            print(data)
            print(type(data))

            # checks if user is in data
            if user_id not in data['users'].__str__():
                data.update({})
                print(data)

                # checks if data is type list
                if type(data) is dict:
                    data = [data]
                    print(type(data))

                # updates data with new user
                data.append({"user_id": user_id})
                print(data)
                
                # writes new data to json file
                with open("test.json", "w"):
                    json.dump(data, f)

Error Code:  Command raised an exception: UnsupportedOperation: not writable
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W3Schools
w3schools.com › python › pandas › pandas_json.asp
Pandas Read JSON
In our examples we will be using a JSON file called 'data.json'. Open data.json. ... Tip: use to_string() to print the entire DataFrame. ... JSON objects have the same format as Python dictionaries.
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freeCodeCamp
freecodecamp.org › news › how-to-use-the-json-module-in-python
How to Use the JSON Module in Python – A Beginner's Guide
June 5, 2023 - The JSON module provides you with a json.dumps() function to serialize Python objects into a JSON formatted string. It provides various options for customization, including formatting the output to make it more human-readable.
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W3Schools
w3schools.com › python › gloss_python_json_parse.asp
Python JSON Parse
Python JSON Tutorial JSON Convert into JSON Format JSON Sort JSON ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com