NodeJS req.body of textarea return different new line type from read file

Currently, I'm working with hashing string related which required the string to be precise(even the new line symbols).

For example I have the following code to read:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract GetSet {
  uint256 private total;
  mapping(address => uint256) private numbers;
  mapping(uint256 => uint256) private heavyArr;

  function getTotal() external view returns (uint256) {
    return total;
  }

  function setNumber(uint256 _num) external returns (bool) {
    total = total - numbers[msg.sender] + _num;
    numbers[msg.sender] = _num;
    return true;
  }

  function setHeavy() external returns (bool) {
    for(uint i = 0; i < 100; i++) {
      heavyArr[i] = heavyArr[i] + 1;
    }
    return true;
  }

  function getNumber(address _user) external view returns (uint256) {
    return numbers[_user];
  }
}

I tried to get this content when I pasted it into the textarea on the form and receive it from req.body in NodeJs. I already used

app.use(bodyParser.json());

After that I printed with

console.log(JSON.stringify(contractCode));

to see the new line symbol, it return the following:

// SPDX-License-Identifier: MIT\r\npragma solidity ^0.8.0;\r\n\r\ncontract GetSet {\r\n uint256 private total;\r\n mapping(address => uint256) private numbers;\r\n mapping(uint256 => uint256) private heavyArr;\r\n\r\n function getTotal() external view returns (uint256) {\r\n return total;\r\n }\r\n\r\n function setNumber(uint256 _num) external returns (bool) {\r\n total = total - numbers[msg.sender] + _num;\r\n numbers[msg.sender] = _num;\r\n return true;\r\n }\r\n\r\n function setHeavy() external returns (bool) {\r\n for(uint i = 0; i < 100; i++) {\r\n heavyArr[i] = heavyArr[i] + 1;\r\n }\r\n return true;\r\n }\r\n\r\n function getNumber(address _user) external view returns (uint256) {\r\n return numbers[_user];\r\n }\r\n}

The second one is when I put the code in the file and read from it with

console.log(JSON.stringify(fs.readFileSync('GetSet.sol', 'utf8')));

It return the following:

// SPDX-License-Identifier: MIT\npragma solidity ^0.8.0;\n\ncontract GetSet {\n uint256 private total;\n mapping(address => uint256) private numbers;\n mapping(uint256 => uint256) private heavyArr;\n\n function getTotal() external view returns (uint256) {\n return total;\n }\n\n function setNumber(uint256 _num) external returns (bool) {\n total = total - numbers[msg.sender] + _num;\n numbers[msg.sender] = _num;\n return true;\n }\n\n function setHeavy() external returns (bool) {\n for(uint i = 0; i < 100; i++) {\n heavyArr[i] = heavyArr[i] + 1;\n }\n return true;\n }\n\n function getNumber(address _user) external view returns (uint256) {\n return numbers[_user];\n }\n}

as you can see, the return strings from textarea req.body and the read file are different with new line symbol(req.body have \r\n while read file only have \n) I don't understand why the 2 ways of getting the text return different results, and how to make them similar(because I need them to be similar to match the hash string every time). I searched and there doesn't seem to be any answer on why textarea/req.body has a different new line symbol so currently I'm kinda stuck on this issue.

The only thing I was able to look up is this which explain what those new line symbols mean https://stackoverflow.com/a/15433263/11225821