python create json file from string

If you have a Python object, you can convert it into a JSON string by using the json.dumps() method.

How to Convert a String to JSON in Python | LearnPython.com

The dumps() method converts a Python object to a JSON formatted string. We can also create a JSON file from data stored in a Python dictionary.

Discussions

python - How do I write JSON data to a file? - Stack Overflow

Because the json string that I produced is coming from dataframe.to_json(). 2023-07-31T03:11:11.25Z+00:00 ... Might be worth to point out that ensure_ascii=False is not the default and needed for words like grün. 2026-02-03T19:20:22.357Z+00:00 ... Save this answer. ... Show activity on this post. To get utf8-encoded file as opposed to ascii-encoded in the accepted answer for Python ... More on stackoverflow.com

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python - How to save a string to a json file - Stack Overflow

I want to save a string to a json file, but when I do it will write it with \" and with quotes at the beginning and at the end. import json name_c = ['Don', 'Perez'] my_details = "data = {" + "... More on stackoverflow.com

stackoverflow.com

How would you use python to create JSON files?

From StackOverflow JSON is basically a way of communicating data to someone, with very specific rules. Using Key Value Pairs and Arrays. JSON is very lightweight and is a nice way to store information. If you request a web-server, most responses will be in JSON format. Example of JSON data (also from StackOverflow): { "first_name": "John", "last_name": "Smith", "address": { "street_address": "21 2nd Street", "city": "New York", "state": "NY", "postal_code": 10021 }, "phone_numbers": [ "212 555-1234", "646 555-4567" ] } Now, to answer your question. How to create JSON files using Python? First, you need valid JSON in your Python code. images = [ { "name": "awesome_image.png", "file_size": 1240000, "file_type": "image/png", }, { "name": "good_image.jpg", "file_size": 742600, "file_type": "image/jpeg" } ] Now, using the json library # Load data. This will transform the data into an indented string. json_data = json.dumps(images, indent=2) # Create and write to file. with open("/home/user/Documents/images.json", "w") as json_file: json_file.write(json_data) How to load JSON files in Python? # Open file in read mode. with open("/home/user/Documents/images.json", "r") as f: # We can do this in two ways. # 1. Load file directly. data = json.load(f) # 2. Load from the file's contents. data = json.loads(f.read()) Now all the file content is stored in the data variable. If you are dealing with files, it's better to load and work with them in Python. It'll be faster than to keep opening and closing files all the time. Create functions to write/load files and use them when you need to. More on reddit.com

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March 7, 2020

How To Combine Two Json Values

That will create a new file containing an array of the first 5 elements of the input array. ... You would be much better off doing this in Python, which has JSON reader libraries readily available. It would also be much faster than a Bash effort to do this. ... I might finally learn what goes on in JSON files! ... Representing very long strings... More on reddit.com

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August 19, 2019

Real Python

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Working With JSON Data in Python – Real Python

July 21, 2026 - You can write JSON with Python by using the json.dump() function to serialize Python objects into a JSON file. ... You connect JSON with Python by using the json module to serialize Python objects into JSON and deserialize JSON data into Python ...

Vertabelo Academy

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How to Read and Write JSON Files in Python | Learn Python | Vertabelo Academy

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. Have a look: with open('data.json', 'w') as outfile: json.dump(data, outfile) ...

Python Examples

pythonexamples.org › python-create-json

Python Create JSON

In Python, you can create JSON string by simply assigning a valid JSON string literal to a variable, or convert a Python Object to JSON string using json.loads() function. In this tutorial, we will create JSON from different types of Python objects.

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Python JSON – How to Convert a String to JSON

November 9, 2021 - // It defines the first name and last name of an employee · To use JSON with Python, you'll first need to include the JSON module at the top of your Python file. This comes built-in to Python and is part of the standard library.

Python Examples

pythonexamples.org › python-write-json-to-file

Python Write JSON to File

To write JSON to File in Python, first prepare the JSON string using json.dumps() method, and then create a JSON file and write the prepared JSON string to the file using open() and file.write() functions.

Stack Overflow

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python - How do I write JSON data to a file? - Stack Overflow

Top answer

1 of 16

3357

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.

2 of 16

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.

Programiz

programiz.com › python-programming › json

Python JSON: Read, Write, Parse JSON (With Examples)

To write JSON to a file in Python, we can use json.dump() method. import json person_dict = {"name": "Bob", "languages": ["English", "French"], "married": True, "age": 32 } with open('person.txt', 'w') as json_file: json.dump(person_dict, json_file) In the above program, we have opened a file ...

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docs.python.org › 3 › library › json.html

JSON encoder and decoder — Python 3.14.7 documentation

If zero, negative, or "" (the empty string), only newlines are inserted. If None (the default), no newlines are inserted. separators (tuple | None) – A two-tuple: (item_separator, key_separator). If None (the default), separators defaults to (', ', ': ') if indent is None, and (',', ': ') otherwise. For the most compact JSON, specify (',', ':') to eliminate whitespace.

GeeksforGeeks

geeksforgeeks.org › python › reading-and-writing-json-to-a-file-in-python

Reading and Writing JSON to a File in Python - GeeksforGeeks

12:15

Explanation: We define a JSON string and use json.loads() to parse it into a Python dictionary, then print the resulting object and its type. Writing data to a JSON file in Python involves converting Python objects like dictionaries into JSON ...

Published: August 5, 2025

Stack Overflow

stackoverflow.com › questions › 56450311 › how-to-save-a-string-to-a-json-file

python - How to save a string to a json file - Stack Overflow

Top answer

1 of 2

Why to not write string in file?

name_c = ['Don', 'Perez']
with open("out.txt", "w+") as f:
    f.write("data = {{\"name\": {}, \"lastname\": {}}}".format(*name_c))

If you want to use json, then smth like this:

name_c = ['Don', 'Perez']
with open("out.txt", "w+") as f:
    f.write("data = ")
    json.dump({"name": name_c[0], "lastname": name_c[1]}, f)

Or this:

name_c = ['Don', 'Perez']
with open("out.txt", "w+") as f:
    f.write("data = " + json.dumps({"name": name_c[0], "lastname": name_c[1]}))

2 of 2

It is adding quotes because you are dumping a string; this is done regardless of what that string represents. If you want it to dump an object, you have to give it an object to dump.

GeeksforGeeks

geeksforgeeks.org › python › build-a-json-object-in-python

Build a Json Object in Python - GeeksforGeeks

July 23, 2025 - import json def encoder(obj): if isinstance(obj, set): return list(obj) return obj gfg = [('name', 'Hustlers'), ('age', 19), ('is_student', True)] json_data = dict(gfg) json_string = json.dumps(json_data, default=encoder) print(type(json_string)) print(json_string)...

Stack Abuse

stackabuse.com › reading-and-writing-json-to-a-file-in-python

Reading and Writing JSON to a File in Python

April 18, 2023 - If you encounter this edge-case, which has since been fixed in subsequent Python versions - try using json.dumps() instead, and write the string contents into a file instead of streaming the contents directly into a file.

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

Ensure data types in Python are compatible with JSON (e.g., dictionaries and lists). Always close files to avoid resource leaks; the with statement is a helpful tool here. Use indent to create human-readable JSON files—this can be useful for debugging and manual inspection.

Board Infinity

boardinfinity.com › blog › json-file-in-python

JSON file in Python: Read and Write | Board Infinity

January 3, 2025 - Indentation: Estimate the indent of the JSON string which will make the JSON string more easily understandable and readable. Indents = 4 nests the data structures making them have additional spacing. Sorting Keys: You can also use the sort_keys=True parameter for the keys to be sorted in alphabetical order. #format and write json file in python json.dump(data, file, indent=4, sort_keys=True)

DataCamp

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Python JSON Data: A Guide With Examples | DataCamp

December 3, 2024 - Here are some common functions from json library that are used for serialization and deserialization. This function is used to serialize a Python object into a JSON string. The dumps() function takes a single argument, the Python object, and returns a JSON string.

Delft Stack

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How to Write JSON to a File in Python | Delft Stack

February 2, 2024 - Then we are creating and opening a new file with the name that we chose in the write mode. Then, we use the loads function from the json module to convert the JSON string to a python dictionary to write it to a file.

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! =^)