NodeJS MSSQL .query returning double data in both recordsets and recordset

Question

I'm seeing all data rows repeated twice in my JSON returned from mssql in Node:

{
        "recordsets": [[{
                    "student_firstname": "Jonah                ",
                    "student_lastname": "Hill                    "
                }, {
                    "student_firstname": "Debra                   ",
                    "student_lastname": "Smith               "
                }
            ]],
        "recordset": [{
                "student_firstname": "Jonah                ",
                "student_lastname": "Hill                    "
            }, {
                "student_firstname": "Debra                   ",
                "student_lastname": "Smith               "
            }
        ],
        "output": {},
        "rowsAffected": [2]
    }

I temporarily changed the query to get two rows to see if all rows would be duplicate, and they are as you can see above.

function getStudent(studentID) 
{
    console.log("---------getStudent"); 


    sql.on('error', err => {
        // ... error handler 
        console.log("DB Error2: " + err); 
    })


    return sql.connect(config).then(pool => {
            // Query 
            return pool.request()
            .input('input_parameter', sql.Int, studentID)
            //.query('select student_firstname, student_lastname from students where student_id = @input_parameter')
            .query('select student_firstname, student_lastname from students where student_id in (31,32)')
        }).then(function(result) {
            console.log("getStudent:then(result=>"); 
            console.dir(result);
            sql.close(); 
            return result; 
        })
        .catch(err => {
            // ... error checks 
            console.log("DB Error1: " + err); 
            sql.close(); 
            throw err; 
        })

}

The above function is called in an app.get statement that returns the JSON.

The console.dir(result) shows the same as the JSON above, except shows "[Object]: in the first line. SO I don't think it's wrapping the JSON further.

{ recordsets: [ [ [Object], [Object] ] ],
  recordset:
   [ { student_firstname: 'Jonah                  ',
       student_lastname: 'Hill                    ' },
     { student_firstname: 'Debra                   ',
       student_lastname: 'Smith                   ' } ],
  output: {},
  rowsAffected: [ 2 ] }

I can work with the data like this, but it's wasting bandwidth.

Answer 1

The data is not retuned twice but just exposed through two properties. The recordset property just exposes the first recordset in recordsets.

mssql documentation:

result.recordsets.length // count of recordsets returned by the procedure
result.recordsets[0].length // count of rows contained in first recordset
result.recordset // first recordset from result.recordsets