is there a way to avoid set a timeout - node.js

Question

I'm trying to collect all values from a mysql table with all the values of the referenced_table_name for each index of the table.
How avoid set a random time out while waiting for a promise
To collect the expected information i need to set a random time out, otherwise my object is undefined...
module.exports = {
getTable: async (req, res) => {
const tablename = req.params.table,
dbName = req.params.dbName;
let jsonResult = {};
getTableValues(dbName, tablename)
.then(tableValues => {
getTableIndexedCol(dbName, tablename)
.then(indexedColumns => {
let indexedArr = {};
for (let index = 0; index < indexedColumns.length; index++) {
const element = indexedColumns[index],
column = element.column_name,
referencedTable = element.referenced_table_name;
let allValuesRefTable = new Array();
getTableValues(dbName, referencedTable)
.then(referencedTableValues => {
for (let i = 0; i < referencedTableValues.length; i++) {
const el = referencedTableValues[i];
allValuesRefTable.push(el.name);
}
})
.catch(err => console.log(err));
/*IF NO TIMEOUT DOESN'T WORK*/
setTimeout(function(){
indexedArr[column] = allValuesRefTable;
}, 100);
}
setTimeout(function(){
jsonResult = {
name: tablename,
rows : tableValues,
rowIndexed : indexedArr
}
res.json(jsonResult);
}, 5000);
})
.catch(err => console.log(err));
})
.catch(err => console.log(err));
}
};
Is there a way to don't use setTimeout? or how can I 'wait' that the promise is resolved?
Here is my function getTableIndexedCol for example:
async function getTableIndexedCol(dbName, tablename) {
const sqlRefTable = SELECT...;
return new Promise (async function(resolve, reject){
try{
[refTable, refTableFields] = await promisePool.query(sqlRefTable)
}
catch(err){
reject(err)
}
setTimeout(function () {
resolve(refTable);
}, 500);
})

Answer 1

If you are already using async/await you can use it all the way and avoid the "Promise Hell" (nested .then calls):
module.exports = {
getTable: async (req, res) => {
try {
const tablename = req.params.table,
dbName = req.params.dbName;
const tableValues = await getTableValues(dbName, tablename);
const indexedColumns = await getTableIndexedCol(dbName, tablename);
let indexedArr = {};
for (let index = 0; index < indexedColumns.length; index++) {
const element = indexedColumns[index],
column = element.column_name,
referencedTable = element.referenced_table_name;
let allValuesRefTable = new Array();
const referencedTableValues = await getTableValues(dbName, referencedTable);
for (let i = 0; i < referencedTableValues.length; i++) {
const el = referencedTableValues[i];
allValuesRefTable.push(el.name);
}
indexedArr[column] = allValuesRefTable;
}
const = jsonResult = {
name: tablename,
rows: tableValues,
rowIndexed: indexedArr
}
res.json(jsonResult);
} catch (err) {
console.log(err);
}
}
};