How to use $in in request

the correct syntax should be something like this: ( I haven't tested it 

https://<instance>/rest/v11_13/Accounts?filter[0][id][$in][]=21a74144-9e8a-11eb-b1e9-067f2945c900&filter[0][id][$in][]=22b14daa-9e8a-11eb-80ac-067f2945c900

thanks for sharing yes it worked (y)

I actually converted filter JSON object and converted in query string online here [ https://www.convertonline.io/convert/json-to-query-string ] and it worked

I would recommend to use the POST filter api, especially if you are passing a number of filters/conditions (like a $in calls for).

Reason being that urls have a much shorter accepted limit than post payloads.

Example:

POST /rest/v10/Leads/filter

{
    "fields": "id,date_modified,first_name,last_name",
    "filter": [
        {
            "$and": [
                {
                    "date_modified": {
                        "$gte": "2021-10-17T23:12:15+00:00"
                    }
                },
                {
                    "date_modified": {
                        "$lt": "2021-10-23T01:04:43+00:00"
                    }
                },
                {
                    "id": {
                        "$in": [
                            "0719c890-2fa0-11ec-8dd2-0221da82edeb",
                            "0711ba6a-2fa0-11ec-8b02-0221da82edeb",
                            "07091018-2fa0-11ec-ac61-0221da82edeb",
                            "06ffe3a8-2fa0-11ec-a2f1-0221da82edeb",
                            "06f6e65e-2fa0-11ec-8c2e-0221da82edeb",
                            "06ee9922-2fa0-11ec-a3bc-0221da82edeb",
                            "06e6ad48-2fa0-11ec-bda2-0221da82edeb"
                        ]
                    }
                }
            ]
        }
    ],
    "max_num": 10,
    "offset": 0,
    "order_by": "date_modified:DESC,id:DESC"
}

Hope it helps!