writing to a json file from python

Question

how do i edit/change a particular field in a json file using python code:

{
   "EZMessage":{
      "action":"account.cash",
      "data":{
         "authToken":"123456",
         "account":"#ACCOUNTID#",
         "portfolio":"true",
         "historical":"true"
      }
   }
}

in this json code, i want to replace 123456 with 789123

string replace only works if i know what is written there. in my code, i would only know what to write, and the identifier "authToken". Is there a way to overwrite the 123456 by identifying that it is the value of "authToken" ?

thanks,

RS

tacaswell · Accepted Answer · 2013-01-30 04:53:30Z

3

Use the json module to convert the string to a set of nested dict objects, make your changes, and then dump the dictionary back to a json string.

import json
jstr = '''{
   "EZMessage":{
      "action":"account.cash",
      "data":{
         "authToken":"123456",
         "account":"#ACCOUNTID#",
         "portfolio":"true",
         "historical":"true"
      }
   }
}'''

j = json.loads(jstr)
j['EZMessage']['data']['authToken'] = 654321
jstr = json.dumps(j)

For how to read-from/write-to a file see the fine tutorial.

edited Jan 30, 2013 at 4:53

answered Jan 30, 2013 at 1:59

tacaswell

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1 Comment

Rupam Shrivastava Over a year ago

thanks - actually this is a json file (TXT.json) and i have to write the modified json in there. how do i do that?

Matt Runion · Accepted Answer · 2013-01-30 01:57:41Z

2

Convert the JSON object to a Python object, then change the value just like any other Python object.

answered Jan 30, 2013 at 1:57

Matt Runion

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1 Comment

Rupam Shrivastava Over a year ago

I guess i am looking for a function that helps me write into a json file (TXT.json) into a specific field like: ['EZMessage']['data']['authToken']

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