Prettify and transform json from command line

pretty-print-json-extended.sh

#!/usr/bin/env bash

JS='
var toEval = process.argv[1];

process.stdin.resume();
process.stdin.setEncoding("utf8");
var json = "";
process.stdin.on("data", function(buf) {
  json += buf;
});
process.stdin.on("end", function() {
  const obj = JSON.parse(json);
  const modifiedJObj = eval(toEval);
  console.log(JSON.stringify(modifiedJObj, null, 2));
});
'

node -e "$JS" -- "$1"

Add the snippet in your .bashrc

alias pjsone='sh ~/.scripts/pretty-print-json-extended.sh'

Try it out:

echo '{"a": { "b": [1, 2, 3]}}' | pjsone "obj.a.b[1]"
echo '{"a": { "b": [1, 2, 3]}}' | pjsone "obj.a.b.map(item => item * 2)"

You can use other packages as well (if you install them alongside the script):

echo '{"a": { "b": [1, 2, 3]}}' | pjsone "var R = require('ramda'); R.zip(obj.a.b, obj.a.b)"