How do I extract value of a JSON key using bash shell?

Question

I'm using bash shell. I would like to include something in my shell script that can extract the value of a certain key in a JSON string ...

davea$ json='{"id": "abc", "name": "dave"}'

I tried "grep", which failed

davea$ grep -Po '"id":.*?[^\\]",' $json
usage: grep [-abcDEFGHhIiJLlmnOoqRSsUVvwxZ] [-A num] [-B num] [-C[num]]
    [-e pattern] [-f file] [--binary-files=value] [--color=when]
    [--context[=num]] [--directories=action] [--label] [--line-buffered]
    [--null] [pattern] [file ...]

Then I found a solution involving Python, but this also failed ...

localhost:tmp davea$ echo $json | python -c 'import json,sys;obj=json.load(sys.stdin);print obj["id"]'
  File "<string>", line 1
    import json,sys;obj=json.load(sys.stdin);print obj["id"]

How can I extract the value for the "id" key without installing anything extra on my system?

Solution

Your python code works well. Be aware that you might need brackets around the argument to print if you use python3.

echo "$json" | python2 -c 'import json,sys;obj=json.load(sys.stdin);print obj["id"]'

echo "$json" | python3 -c 'import json,sys;obj=json.load(sys.stdin);print(obj["id"])'

Alternatively, use jq:

echo "$json" | jq -r .id

Output for all solutions above:

abc

Comments

[Dave]

@pLumo -- that was the issue, I had Python 3 installed but the code I was using was Python 2.

[Kusalananda]

Your title says you want to use the bash shell, but your examples uses grep and python. Would it be ok to update the title?