Exporting sheet data to JSON file - google-apps-script

Question

This is my simple Sheet divided by freezed rows to Head and Body:
And this is what the final output(json) should look like:
{
"3":{
"AB1":{
"A2":"A3",
"B2":"B3"
},
"C1":{
"C2":"C3"
}
},
"4":{
"AB1":{
"A2":"A4",
"B2":"B4"
},
"C1":{
"C2":"C4"
}
},
...
}
My code look like this:
function doGet() {
var SpreadSheet = SpreadsheetApp.getActiveSpreadsheet();
var Sheet = SpreadSheet.getSheets()[1];
var FirstRow = 1;
var FirstColumn = 1;
var LastRow = Sheet.getLastRow();
var LastColumn = Sheet.getLastColumn();
var FrozenRows = Sheet.getFrozenRows();
var FrozenColumns = Sheet.getFrozenColumns();
var HeadRange = Sheet.getRange(FirstRow, FirstColumn + FrozenColumns, FrozenRows - FirstRow + 1, LastColumn - FrozenColumns); // A1:C2
var HeadData = HeadRange.getValues(); // [[AB1, , C1], [A2, B2, C2]]
var BodyRange = Sheet.getRange(FirstRow + FrozenRows, FirstColumn + FrozenColumns, LastRow - FrozenRows, LastColumn - FrozenColumns); // A3:C6
var BodyData = BodyRange.getValues(); // [[A3, B3, C3], [A4, B4, C4], [A5, B5, C5], [A6, B6, C6]]
and will end with this:
var OutputData = ContentService.createTextOutput(JSON.stringify(InputData)).setMimeType(ContentService.MimeType.JSON);
return OutputData;
and now my problems :), first problem is, how get value from empty merged cell, when don't know his range, only know other side when know range and want value
for (var i = 0; i < HeadData[0].length; i++) {
var Category = HeadData[0][i];
var CellValue = (RangeCell.isPartOfMerge() ? RangeCell.getMergedRanges()[0].getCell(1,1) : RangeCell).getValue();
Second problem is, how put code together when want start json with number of row data, then category, subcategory and last with item data:
var Obj = {};
for (var i = 1; i <= ItemsRange.getNumRows(); i++) {
var ItemIndex = ItemsRange.getCell(i,1).getRowIndex();
for (var j = 0; j < BodyData.length; j++) {
for (var k = 0; k < BodyData[j].length; k++) {
var ItemCell = BodyData[j][k];
}
}
Obj[ItemIndex] = {};
}

Answer 1

In this case, how about the following flow?
Retrieve values from Spreadsheet.
This is from your script.
Recreate header rows.
Create the result object.
Modification points:
In this modification, at first, the header data is created. The merged ranges can be retrieve by getMergedRanges(). I created the header data using this.
When your sample Spreadsheet is used, HeadData becomes [[AB1, AB1, C1], [A2, B2, C2]] from [[AB1, , C1], [A2, B2, C2]].
In your case, it has already been found that the result object is the nested object with 3 levels. I think that this can be used.
Modified script:
function doGet() {
// 1. Retrieve values from Spreadsheet. This is from your script.
var SpreadSheet = SpreadsheetApp.getActiveSpreadsheet();
var Sheet = SpreadSheet.getSheets()[1];
var FirstRow = 1;
var FirstColumn = 1;
var LastRow = Sheet.getLastRow();
var LastColumn = Sheet.getLastColumn();
var FrozenRows = Sheet.getFrozenRows();
var FrozenColumns = Sheet.getFrozenColumns();
var HeadRange = Sheet.getRange(FirstRow, FirstColumn + FrozenColumns, FrozenRows - FirstRow + 1, LastColumn - FrozenColumns); // A1:C2
var HeadData = HeadRange.getValues(); // [[AB1, , C1], [A2, B2, C2]]
var BodyRange = Sheet.getRange(FirstRow + FrozenRows, FirstColumn + FrozenColumns, LastRow - FrozenRows, LastColumn - FrozenColumns); // A3:C6
var BodyData = BodyRange.getValues(); // [[A3, B3, C3], [A4, B4, C4], [A5, B5, C5], [A6, B6, C6]]
// 2. Recreate header rows.
Sheet.getRange(1, 1, 1, Sheet.getLastColumn()).getMergedRanges().forEach(r => {
let temp = "";
for (let i = r.getColumn(); i <= r.getNumColumns(); i++) {
if (HeadData[0][i - 1].toString() != "") temp = HeadData[0][i - 1];
}
for (let i = r.getColumn(); i <= r.getNumColumns(); i++) {
HeadData[0][i - 1] = temp;
}
});
// 3. Create the result object.
const InputData = BodyData.reduce((o1, r, i) => {
o1[i + FirstRow + FrozenRows] = r.reduce((o2, c, j) => {
const t1 = HeadData[0][j];
const t2 = {[HeadData[1][j]]: c};
return Object.assign(o2, {[t1]: o2[t1] ? Object.assign(o2[t1], t2) : t2});
}, {});
return o1;
}, {});
var OutputData = ContentService.createTextOutput(JSON.stringify(InputData)).setMimeType(ContentService.MimeType.JSON);
return OutputData;
}
Result:
When your sample Spreadsheet is used, the value of InputData is as follows.
{
"3": {
"AB1": {
"A2": "A3",
"B2": "B3"
},
"C1": {
"C2": "C3"
}
},
"4": {
"AB1": {
"A2": "A4",
"B2": "B4"
},
"C1": {
"C2": "C4"
}
},
"5": {
"AB1": {
"A2": "A5",
"B2": "B5"
},
"C1": {
"C2": "C5"
}
},
"6": {
"AB1": {
"A2": "A6",
"B2": "B6"
},
"C1": {
"C2": "C6"
}
}
}
Note:
When you modified the script of Web Apps, please redeploy the Web Apps as new version. By this, the latest script is reflected to the Web Apps. Please be careful this.
When your actual situation is largely different from your sample Spreadsheet in your question, this modified script might not work. So please be careful this.
Please use this modified script with V8.
References:
getMergedRanges()
reduce()
Object.assign()