Creating a JSON object from Google Sheets

I am trying to learn AppScript and I am using Google Sheets as an example. I want to create a simple JSON object using some data populated in the Sheet.

Table Example

Name    ID   Price   Qty
ABC     123  100      1
DEF     342   56      2
HIJ     233   90      3
IJK     213   68      5

I want the JSON out to be something like

[
  {
    "Name": "ABC",
    "ID": "123",
    "Price": 100,
    "Qty": 1
  },
  {
    "Name": "DEF",
    "ID": "342",
    "Price": 56,
    "Qty": 2
  },
  {
    "Name": "HIJ",
    "ID": "233",
    "Price": 90,
    "Qty": 3
  },
  {
    "Name": "IJK",
    "ID": "213",
    "Price": 68,
    "Qty": 5
  }
]

I started by following this Youtube tutorial : https://www.youtube.com/watch?v=TQzPIVJf6-w. However that video talks about creating each column header as a the object. Where as i want the Column name to be the key and the Row value to be the value.

Here is my current AppScript Code

function doGet() {
  var result={};
  var rewards = SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Sheet1')
  .getDataRange()
  .getValues();

  result.rewardObj = makeObject(rewards);
  //Logger.log(result.rewardObj);
  return ContentService.createTextOutput(JSON.stringify(result))
  .setMimeType(ContentService.MimeType.JSON)


}

function makeObject(multiArray)
{
  var obj = {}; 
  var colNames = multiArray.shift();
  var rowNames = multiArray.slice(0,1);
  var rowCount = SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Sheet1').getLastRow();
  var colCount = SpreadsheetApp.getActiveSpreadsheet().getSheetByName('Sheet1').getLastColumn();

  for(var j=0;j<4;j++)
  {
    for(var i=0;i<4;i++)
      {
        //obj[colNames] = rowNames.map(function(item){return item[i];});
        obj[colNames[j][i]] = multiArray[j][i];
      }
  }
  Logger.log(rowCount)
  Logger.log(colCount)
  Logger.log(multiArray[57][12]);
  return obj;
}

The output is a single object

{"rewardObj":{"Name":"ABC","ID":"123","Price":"100","Qty":"1"}}

PS: I am not a programmer, I am just learning some scripting in a hackey way. Apologies for not knowing the basics 🙂

Answer

Please try:

function getJsonArrayFromData(data)
{

  var obj = {};
  var result = [];
  var headers = data[0];
  var cols = headers.length;
  var row = [];

  for (var i = 1, l = data.length; i < l; i++)
  {
    // get a row to fill the object
    row = data[i];
    // clear object
    obj = {};
    for (var col = 0; col < cols; col++) 
    {
      // fill object with new values
      obj[headers[col]] = row[col];    
    }
    // add object in a final result
    result.push(obj);  
  }

  return result;  

}

Test function:

function test_getJsonArrayFromData()
{
  var data =   
    [
      ['Planet', 'Mainland', 'Country', 'City'],
      ['Earth', 'Europe', 'Britain', 'London'],
      ['Earth', 'Europe', 'Britain', 'Manchester'],
      ['Earth', 'Europe', 'Britain', 'Liverpool'],
      ['Earth', 'Europe', 'France', 'Paris'],
      ['Earth', 'Europe', 'France', 'Lion']
    ];

    Logger.log(getJsonArrayFromData(data));

    // =>  [{Mainland=Europe, Country=Britain, Planet=Earth, City=London}, {Mainland=Europe, Country=Britain, Planet=Earth, City=Manchester}, {Mainland=Europe, Country=Britain, Planet=Earth, City=Liverpool}, {Mainland=Europe, Country=France, Planet=Earth, City=Paris}, {Mainland=Europe, Country=France, Planet=Earth, City=Lion}]

}