How to include an environment variable in a json file?

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I have some json file that looks like this:

{
  "firstname": "John",
  "lastname": "Doe",
  "age": 25,
  "profile": "/home/John/Pictures/john.png"
}

But i want it to be more general, not specific to John only. So i want to replace "/home/John" with like $HOME. But that doesn't work with json files apparently. Here's what i tried:

{
  "firstname": "John",
  "lastname": "Doe",
  "age": 25,
  "profile": "$HOME/Pictures/john.png"
}

How can I resolve this? Or is there another way?

Thanks.

key environment-variables json
1 Answers

To perform the variable substitution in python3 , follow the below steps.

Change "$HOME" to "${HOME}" in JSON file. The JSON file looks like below:

{
  "firstname": "John",
  "lastname": "Doe",
  "age": 25,
  "profile": "${HOME}/Pictures/john.png"
}

Below script indicates how to substitute.

import os
import json

#Pass the above JSON file and create a file object

fileObj = open('nameOFJsonFile.json',)

#Convert JSON and parse as Python Dictionary

jsonDict = json.load(fileObj)

#Substitute the value wherever required using os.path.expandvars

jsonDict["profile"]=os.path.expandvars(jsonDict["profile"])
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