Daniel Himmelstein <daniel.himmelst...@gmail.com> added the comment:

Since opening this issue, I've encountered several additional instances where 
indentation control would have been nice. I don't agree that jq is a sufficient 
substitute:

1. jq is generally not pre-installed on systems. For projects where users are 
guaranteed to have Python installed (but may be on any operating system), it is 
most straightforward to be able to just use a python command and not have to 
explain how to install jq on 3 different OSes.

2. jq does a lot more than prettifying JSON. The simple use case of 
reformatting JSON (to/from a file or stdin/stdout) can be challenging.

3. json.tool describes itself as a "simple command line interface to ... 
pretty-print JSON objects". Indentation is an essential aspect of pretty 
printing. Why even have this CLI if we're unwilling to add essential basic 
functionality that is already well supported by the underlying json.dump API?

Python excels at APIs that match user needs. It seems like we're a small change 
away from making json.tool flexible enough to satisfy real-world needs.

So I'm in favor of merging PR 9765 or PR 345. I'm happy to do the work on 
either to get them mergeable based on whatever specification we can agree on 
here.

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<https://bugs.python.org/issue29636>
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