Get Latest Child Site Created under SharePoint Site using REST API

Syntax

REST API Endpoint:

https://SharePointSiteURL/_api/web/webs?$orderby=created desc&$top=1

REST API endpoint to use in Add-ins:

<appweburl>/_api/SP.AppContextSite(@target)/web/webs?$orderby=created desc&$top=1&@target=<hostweburl>

Embed Code Snippet

The following code snippet can be added to SharePoint page or in content editor web part as a script. This example used to get the last created child site’s title.

<script type="text/javascript" src="/SiteAssets/Scripts/jquery-1.9.1.min.js"></script>
<script type="text/javascript">
var dataval;
$.ajax({
   url: _spPageContextInfo.webAbsoluteUrl+"/_api/web/webs?$orderby=created desc&$top=1", //THE ENDPOINT
   method: "GET",
   headers: { "Accept": "application/json; odata=verbose" },
   success: function (data) {

    console.log("Website '" + data.d.results[0].Title + "' created on " + data.d.results[0].Created) //RESULTS HERE!!
    alert("Website '" + data.d.results[0].Title + "' created on " + data.d.results[0].Created);
   }
});
</script>

Add-in Code Snippet

The following code snippet is used in SharePoint Add-in to get the latest child sub-site created under the SharePoint site.

// Load the js files and continue to the successHandler
$.getScript(scriptbase + "SP.RequestExecutor.js", execCrossDomainRequest);

// Function to prepare and issue the request to get
//  SharePoint data
function execCrossDomainRequest() {

    // Initialize the RequestExecutor with the add-in web URL.
    var executor = new SP.RequestExecutor(appweburl);

    // Issue the call against the add-in web.
    // To get the AllowRssFeeds property using REST we can hit the endpoint:
    //      appweburl/_api/web?select=AllowRssFeeds&@target=hostweburl
    // The response formats the data in the JSON format.
    executor.executeAsync(
        {
            url: appweburl + "/_api/SP.AppContextSite(@target)/web/webs?$orderby=created desc&$top=1&@target='" + hostweburl + "'",
            method: "GET",
            headers: {
                "Accept": "application/json; odata=verbose"
            },
            success: successHandler,
            error: errorHandler
        }
    );
}

// Function to handle the success event.
// Prints the host web's title to the page.
function successHandler(data) {
    var jsonObject = JSON.parse(data.body)
    //jsonObject.d.results returns the collection web object properties
    console.log("Website '" + jsonObject.d.results[0].Title+"' created on "+ jsonObject.d.results[0].Created);
     $('#message').html("Website '" + jsonObject.d.results[0].Title+"' created on "+ jsonObject.d.results[0].Created);


}

function errorHandler(data, errorCode, errorMessage) {
    console.log("Could not complete cross-domain call: " + errorMessage);
}