codeBarer codeBarer - 4 months ago 152
JSON Question

Python read JSON file and modify

Hi I am trying to take the data from a json file and insert and id then perform POST REST.
my file data.json has:

{
'name':'myname'
}


and I would like to add an id so that the json data looks like:

{
'id': 134,
'name': 'myname'
}


So I tried:

import json
f = open("data.json","r")
data = f.read()
jsonObj = json.loads(data)


I can't get to load the json format file.
What should I do so that I can convert the json file into json object and add another id value.

Answer

Set item using data['id'] = ....

import json

with open('data.json', 'r+') as f:
    data = json.load(f)
    data['id'] = 134 # <--- add `id` value.
    f.seek(0)        # <--- should reset file position to the beginning.
    json.dump(data, f, indent=4)
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