Converting Values of Google Spreadsheet to Object using Google Apps Script

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This is a sample script for converting the values of Google Spreadsheet to an object using Google Apps Script.

Sample script

function myFunction() {
  const sheetName = "Sheet1";
  const [headers, ...rows] = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName).getDataRange().getValues();
  const res = rows.map((r) => headers.reduce((o, h, j) => Object.assign(o, { [h]: r[j] }), {}));
  console.log(res);
}

  • When this script is run, the above sample image can be retrieved.

  • In this sample script, the 1st row of the sheet is used as the header row.

  • const res = rows.map((r) => headers.reduce((o, h, j) => Object.assign(o, { [h]: r[j] }), {})); can be also replaced with const res = rows.map((r) => headers.reduce((o, h, j) => (o[h] = r[j], o), {}));.

  • Also, const res = rows.map((r) => headers.reduce((o, h, j) => Object.assign(o, { [h]: r[j] }), {})); can be replaced with const res = rows.map((r) => Object.fromEntries(headers.map((h, j) => [h, r[j]])));.

Added 1

When you want to convert a 2-dimensional array to an object array and vice versa, you can also use the following script.

function myFunction() {
  const sheetName = "Sheet1";
  const [headers, ...rows] = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName).getDataRange().getValues();
  
  // Convert 2-dimentional array to object array.
  const obj = rows.map((r) => headers.reduce((o, h, j) => (o[h] = r[j], o), {}));
  console.log(obj);
  
  // Convert object aray to 2-dimensional array.
  const ar = [headers, ...obj.map(e => headers.map(h => e[h]))];
  console.log(ar);
}

Added 2

For example, for the above sample Spreadsheet, when the same header titles are included, the sample script is as follows.

function myFunction() {
  const sheetName = "Sheet1";
  const [headers, ...rows] = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName).getDataRange().getValues();
  const obj = rows.map((r) => headers.reduce((o, h, j) => (o[h] = o[h] ? [...o[h], r[j]] : [r[j]], o), {}));
  console.log(obj);
}

When this script is run, each value is put into an array like [{"a1":["a2"],"b1":["b2a","b2b","b2c"],"c1":["c2"],"d1":["d2"],"e1":["e2"]},,,,].

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