json-to-pretty-print.js

/*
 * I had to print a lot of json data on a printer so I wanted to make it
 * as compact as possible.
 *
 * This snippet changes text JSON into compact form.
 * 
 * input:
 *  `{
 *    "width": 1080,
 *    "height": 1920,
 *    "data": [
 *      "test"
 *    ]
 *  }`
 * 
 * output:
 *    "width": 1080,
 *    "height": 1920
 *    "data": [
 *      "test"
*/


function compactJSON(textJSON) {
  console.log('textJSON', textJSON);
  
  const linesArray = `${textJSON}`
    .replace(/\r/g, '')  // get rid of windows-style newlines
    .split('\n');
  
  linesArray.forEach((value, i) => {
    if (value.replace(/[\[\]{,}]/g, '').trim() === '')
    linesArray[i] = '';  // remove lines with no meaning
  });
  
  return linesArray
    .filter(Boolean)  // remove empty lines
    .join('\n');
}

// specific use for running code from web console and google spreadsheets
alert('now activate element you want to read');
setTimeout(() => {
  navigator
    .clipboard
    .writeText(compactJSON(document.activeElement.innerText))
    .then(() => { alert('copied to clipboard') })
    .catch(() => {
      alert('could not copy text; Copy from console by yourself.');
    });
}, 2500);