This is a script for applying changes to base Postman import file. Use node merge-postman.js <source> <target> Where <source> - is a base JSON import file for applying changes And <target> - file with new request to add to <source> file

postman.js

/**
* This is a script for applying changes to base Postman import file.
* Use
* node merge-postman.js <source> <target>
* Where <source> - is a base JSON import file for applying changes
* And <target> - file with new request to add to <source> file
* @author Taras Labiak <taras.labiak@indeema.com>
* {@link https://indeema.com Indeema}
*/

const fs = require('fs');
const path = require('path');

function pretty(object) {
  return JSON.stringify(object, null, '  ');
}


function read(reader = process.stdin, type = 'json', encoding = 'utf8') {
  return read[type](reader, encoding);
}

read.buffer = function buffer(reader = process.stdin) {
  return new Promise(function (resolve, reject) {
    const chunks = [];
    reader.on('data', function (chunk) {
      chunks.push(chunk);
    });
    reader.on('error', function (error) {
      reject(error);
    });
    reader.on('end', function () {
      resolve(chunks.length > 1 ? new Buffer(chunks) : chunks[0]);
    });
  });
};

read.string = async function string(reader = process.stdin, encoding = 'utf8') {
  if ('string' === typeof reader) {
    reader = fs.createReadStream(reader, {encoding});
  }
  const buffer = await read.buffer(reader);
  return buffer.toString(encoding);
};

read.json = async function json(reader = process.stdin, encoding = 'utf8') {
  const string = await read.string(reader, encoding);
  return JSON.parse(string);
};

function getProcessArguments(args = process.argv) {
  const index = args.map(a => path.basename(a)).indexOf('node');
  return args.slice(index + 2);
}

function findByName(array, name) {
  return array.find(item => name === item.name);
}

async function main() {
  const filenames = getProcessArguments();
  const [target, source] = await Promise.all(filenames.map(filename => read.json(filename)));
  for(const item of source.item) {
    const targetCollection = findByName(target.item, item.name);
    if (targetCollection) {
      for(const sourceItem of item.item) {
        const targetItem = findByName(targetCollection.item, sourceItem.name);
        if (!targetItem) {
          targetCollection.item.push(sourceItem);
        }
      }
    }
    else {
      target.item.push(item);
    }
  }
  fs.writeFileSync(filenames[0], pretty(target));
}

void main();