unable to indent json data

[buran]

Can you please let me know what was wrong in my approach ?
I was also doing the same thing but in single line. Isn't that allowed ?

No, you were not doing the same thing in a single line
indent and sort_keys are arguments that you can pass to json.dumps()
In your snippet data is a bytes object and by using data() you were trying to call the object like a function (not possible) and getting the error and passing these arguments to it

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Again, note that this is not single JSON string. in the loop you print 9 separate JSON strings.
I guess you may want it to be JSON array of JSON objects