Working on a practice application with the JSON server serving as the backend, I have a question. Is there a way to determine the total number of records at an endpoint without actually loading all the records? For example, if my db.json file contains data like the snippet below, how can I identify that there is only one record at the endpoint without having to fetch the entire record itself?
{
"books": [{
"title": "The Da Vinci Code",
"rating": "0"}]
}
When you request data, json-server automatically includes the total count (under the x-total-count property:
For example:
axios
.get("http://localhost:3001/users", {
params: {
_page: 1,
_limit: 10
}
})
.then(res => {
console.log(res.data); // see your restricted data of "10" items per page
console.log(res.headers["x-total-count"]); // retrieves the total length of your data regardless of pagination
});
To easily access the total count, you can extract the X-Total-Count header from the response.
Shown below is an example of response headers obtained from JSON Server when pagination is activated with the _page parameter (for instance, localhost:3000/contacts?_page=1)
There are three possible choices available to you, and I would suggest going with the third option:
Retrieve all records and calculate their count. This method may be slow and result in a large amount of data being transferred, but it requires minimal code modifications. However, it does leave your server vulnerable to potential attacks from users repeatedly requesting numerous records.
Create a new endpoint specifically for returning the count. While this approach is straightforward, it does add another endpoint that needs to be documented and maintained separately.
Modify the existing endpoint to return the following format:
{
count: 157,
rows: [...data]
}
The advantage of the third option is that everything is consolidated into one endpoint. Furthermore, this setup positions you to potentially include skip and take parameters in the future for enabling pagination of the outcome data.
const fetchData = async () => {
let dataFetch = await fetch("http://localhost:3001/books?_page=1");
let totalBooks = dataFetch.headers.get('X-Total-Count');
}
Create a new endpoint that will provide the count of records. Additionally, consider implementing endpoints for limiting and offsetting to facilitate pagination.
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