This script takes a deformed .json file as argument, then produces formed version.

A-json-formatter.js

var fs = require("fs");
var input = process.argv.slice(2).toString();

// USAGE:
// node 'script' 'target'
// (ex: node A-json-formatter.js a:\source\nodejs\formed.json)

fs.open(input, 'r', (err, fd) => {
  if (err) {
    if (err.code === 'ENOENT') {
      console.error('myfile does not exist');
      return;
    }

    throw err;
  }
  fs.readFile(fd, 'utf8', function (err,deformed) {
    if (err) {
      return console.log(err);
    }

    var parser = JSON.parse(deformed);
    var formed = JSON.stringify(parser, undefined, 4);

    fs.writeFile('formed.json', formed, function(err) {
        if(err) {
          console.log(err);
        } else {
          console.log("JSON saved to " + 'formed.json' + " in "+ __dirname);
        }
    });

   // console.log("Deformed input JSON data:\n\n " + deformed);
  });
});

deformed.json

{"installed":{"client_id":"CLIENT_ID.apps.googleusercontent.com","project_id":"tubenode-v0","auth_uri":"https://accounts.google.com/o/oauth2/auth","token_uri":"https://accounts.google.com/o/oauth2/token","auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs","client_secret":"CLIENT_SECRET","redirect_uris":["urn:ietf:wg:oauth:2.0:oob","http://localhost"]}}

formed.json

{
    "installed": {
        "client_id": "CLIENT_ID.apps.googleusercontent.com",
        "project_id": "tubenode-v0",
        "auth_uri": "https://accounts.google.com/o/oauth2/auth",
        "token_uri": "https://accounts.google.com/o/oauth2/token",
        "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
        "client_secret": "CLIENT_SECRET",
        "redirect_uris": [
            "urn:ietf:wg:oauth:2.0:oob",
            "http://localhost"
        ]
    }
}