This output came from running the raw JSON-serialized response to a REST API through the python json.tool command.

pretty-json

{
    "result_count": 3, 
    "results": [
        {
            "_href": "/ws.v1/lswitch/3ca2d5ef-6a0f-4392-9ec1-a6645234bc55", 
            "_schema": "/ws.v1/schema/LogicalSwitchConfig", 
            "type": "LogicalSwitchConfig"
        }, 
        {
            "_href": "/ws.v1/lswitch/81f51868-2142-48a8-93ff-ef612249e025", 
            "_schema": "/ws.v1/schema/LogicalSwitchConfig", 
            "type": "LogicalSwitchConfig"
        }, 
        {
            "_href": "/ws.v1/lswitch/9fed3467-dd74-421b-ab30-7bc9bfae6248", 
            "_schema": "/ws.v1/schema/LogicalSwitchConfig", 
            "type": "LogicalSwitchConfig"
        }
    ]
}

Well just commenting here to say thanks, that works great. To repeat your blog post here which might help others:

#!/bin/sh

python -m json.tool

Put the above in a file, perhaps, jsonify.sh
Place jsonify.sh (or a link to this script) in the ~/Library/Application Support/BBEdit/Text Filters directory, restart BBEdit.

To use:
Select unformatted JSON, choose jsonify under Text>Apply Text Filters>jsonify . The text will be transformed to pretty printed JSON in place of the unformatted.

So helpful. Thank you!

This is excellent! Update the script if you're using zsh:

#!/bin/zsh

python -m json.tool

Now the path has changed, it's ~/Library/Containers/com.barebones.bbedit/Data/Library/Application Support/BBEdit/Text Filters/