Command to keep only a portion of JSON data from each line?

With a proper jq tool:

jq -c '{"b": .b}' test.json

The output:

{"b":"sd"}
{"b":"bfgg"}

With Miller

$ mlr --json cut -f b test.json
{ "b": "sd" }
{ "b": "bfgg" }

Using the json json parser:

json -f test.json -gac 'return console.log("{ \"b\": \"" + this.b + "\" }")'

In this case jq seems like a better tool for this but I still think json is a really great tool for parsing json data.

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