How to convert the text array to the following format?

if there is an array

["1","2","3"]

how to convert to

"1","2","3"
Aug.06,2021

arr.join(",")

still keep quotation marks

let arr = ["1","2","3"]
let str = JSON.stringify(arr)
str = str.substring(1, str.length - 1)

'1','2','3'

what is this?

if you want to convert the string
visually, it should be
'Test 1, Test 2, Test 3'


arr.toString()  
arr.join() //','
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b36edd-2c069.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b36edd-2c069.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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