Getting JSON Array in a Single Line

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1

Hey, Im trying to get a response here of JSON array in a single line but it is giving in multi line array. Can someone help me with it?

The is the response im getting
{
“id_success”: true,
“user_id”: “”,
“email”: “”,
“roll_number”: “”,
“numbers”: ,
“alphabets”: [
“A”,
“C”,
“Z”,
“c”,
“i”
],
“highest_lowercase_alphabet”: “i”
}

This is the response I want

{
“id_success”: true,
“user_id”: “”,
“email”: “”,
“roll_number”: “”,
“numbers”: ,
“alphabets”: [“A”,“C”,“Z”,“c”,“i”],
“highest_lowercase_alphabet”: “i”
}

This is a post request , Im sending this data to the request

{
“data”: [“A”, “C”, “Z”, “c”, “i”]
}

This is my backend code

export async function POST(request: Request) {
  const requestBody = await request.json();

  const iterableArray: string[] = requestBody.data ?? [];

  const numsArray: number[] = [];
  const letterArray: string[] = [];
  let highestLowercaseLetter = '';

  iterableArray.forEach((item: string) => {
    if (!isNaN(Number(item)) && item.trim() !== '') {
      numsArray.push(Number(item));
    }

    if (/^[A-Z]$/.test(item) || /^[a-z]$/.test(item)) {
      letterArray.push(item);

      if (/^[a-z]$/.test(item)) {
        if (highestLowercaseLetter === '' || item > highestLowercaseLetter) {
          highestLowercaseLetter = item;
        }
      }
    }
  });

  const responseJson = {
    id_success: true,
    user_id: "",
    email: "",
    roll_number: "",
    numbers: numsArray,
    alphabets: letterArray,
    highest_lowercase_alphabet: highestLowercaseLetter
  };

  // Remove the formatting argument to get the array in a single line
  const responseJsonFormat = JSON.stringify(responseJson);

  return new NextResponse(responseJsonFormat, {
    status: 200,
    headers: {
      'Content-Type': 'application/json'
    }
  });
}
2

Both variants are valid JSON format.
Any particular reason why the array should be in single line?

Cheers