REST to get list item by Id

Question

I am always comfortable using JSOM, and I have used less of REST calls to access lists and its Items.

But now I have a requirement to use only REST to get item by its ID.

Is there any code snippet to get list item by its ID. I get ID in query string.

Answer 1

Try this (Excerpt from here):

function getListItem(url, listname, id, complete, failure) {
    // Getting our list items
    $.ajax({
        url: url + "/_api/web/lists/getbytitle('" + listname + "')/items(" + id + ")",
        method: "GET",
        headers: { "Accept": "application/json; odata=verbose" },
        success: function (data) {
            // Returning the results
            complete(data);
        },
        error: function (data) {
            failure(data);
        }
        });
    }
}

Answer 2

Official documentation from MS provides all possible examples.

https://docs.microsoft.com/en-us/sharepoint/dev/sp-add-ins/working-with-lists-and-list-items-with-rest

This will return an individual item.

url: http://site url/_api/web/lists/GetByTitle('Test')/items(item id)
method: GET
headers:

Authorization: "Bearer " + accessToken
accept: "application/json;odata=verbose" or "application/atom+xml"