How do I append a JSON file?

Question

How would I append a JSON file? I know how to append a JSON variable, but how do I append a file? for example, if my JSON file was:

{"people": [{"name" : "Michael Scott", "city": "Scranton"}]}

If I wanted to add another name to people, and that was in a JSON file, how would I do that?

• vahdet: Does this answer your question? python append to array in json object
• xxMrPHDxx: load them first with json.loads (load from string) and then append the names. Then you can json.dumps (stringify) and rewrite the file

Answer 1

You can try

with open("json_exp.txt", "r+") as f:
 json_obj = json.loads(f.read())
 json_obj["people"].append({"name":"new_person"})
 f.seek(0)
 json.dump(json_obj, f)

This code will read a text file that have a JSON object in it and will append a new value to the dict that made by the JSON object in the file then it will store the new JSON object to the file.

• HoneyPoop: what is f.seek?
• Leo Arad: To overwrite the old JSON object without it just append the new object
• Leo Arad: This is answering your question?
• HoneyPoop: Let me test it.

Answer 2

Let's say your destination json is:

# dest.json
{"people": [{"name" : "Michael Scott", "city": "Scranton"}]}

and you want to append the following json:

# source.json
{"name" : "Blah Blah", "city": "blah"}

Try:

import json
with open("destination.json") as fd, open("source.json") as fs:
 dest = json.load(fd)
 source = json.load(fs)
 dest["people"].append(source)
with open("destination.json", 'w') as fd:
 json.dump(dest, fd)