NodeJS get Google Sheet list - node.js

Question

I have a google sheet with a list (dropdown, or data validation - list from ranges, as Google Sheets call it), like so:
Image of sheet
Imagine that in the list I have 4 values to select from. My goal is not only to get all table values, but also all values that constitute the list ["Beer","Wine","Rum","Martini"].
I've tried 2 different ways to retrieve the info and the list:
a) With sheets.spreadsheets.values.get, I get the table values in a digestible way, but not the content of the dropdown. Instead, the cell comes in as blank ("") [Comment: on Apps Script, you would get this information]
b) With sheets.spreadsheets.getByDataFilter, I get much more than I need and in a horrible format. However, I do not get the dropdown content as an array (as I'd want), but rather as a refence: (userEnteredValue: "=Input!$F$5:$F$7")
The question is, how do I get only the table, including the dropdown content as an array? I know it is possible and easy to do in Google Apps Script (I have it implemented), but not on Node.
Below the code as a reference for other programmers.
var {google} = require("googleapis");
let privatekey = require("./client_secret.json");
// configure a JWT auth client
let jwtClient = new google.auth.JWT(
privatekey.client_email,
null,
privatekey.private_key,
['https://www.googleapis.com/auth/spreadsheets',
]);
//authenticate request
jwtClient.authorize(function (err, tokens) {
if (err) {
console.log(err);
return;
} else {
console.log("Successfully connected!");
}
});
//Google Sheets API
let spreadsheetId = '<SPREADSHEET ID>';
let sheetName = 'Input!A1:B4'
let sheets = google.sheets('v4');
exports.fetch = (req, res) => {
sheets.spreadsheets.values.get({
auth: jwtClient,
spreadsheetId: spreadsheetId,
range: sheetName,
}, function (err, response) {
if (err) {
console.log('The API returned an error: ' + err);
} else {
res.json(response);
}
});
// OR
sheets.spreadsheets.getByDataFilter({
auth: jwtClient,
spreadsheetId: spreadsheetId,
"includeGridData": true,
}, function (err, response) {
if (err) {
console.log('The API returned an error: ' + err);
} else {
res.json(response);
}
});
}

Answer 1

What you are interested in is dataValidation
In order to retrieve it, you can use the method spreadsheets.get, setting the parameter fields to sheets/data/rowData/values/dataValidation
If your data validation is set as List of items, the response will look like:
{
"sheets": [
{
"data": [
{
"rowData": [
{
"values": [
{
"dataValidation": {
"condition": {
"type": "ONE_OF_LIST",
"values": [
{
"userEnteredValue": "Beer"
},
{
"userEnteredValue": "Wine"
},
{
"userEnteredValue": "Martini"
}
]
},
"showCustomUi": true
}
}
]
}
]
}
]
}
]
}
If your data validation is set as List form a range the response will look like:
{
"sheets": [
{
"data": [
{
"rowData": [
{
"values": [
{
{
"dataValidation": {
"condition": {
"type": "ONE_OF_RANGE",
"values": [
{
"userEnteredValue": "=Sheet1!$B$1:$B$3"
}
]
},
"showCustomUi": true
}
}
]
}
]
}
]
}
]
}
In the latter case you would need to call subsequently the method spreadsheets.values.get on =Sheet1!$B$1:$B$3 - that is the range returned as userEnteredValue within the object values nested within the object dataValidation.