There are a lot of resources around that show how to do this, but I couldn’t find a comprehensive go-to link, so here we are.

You can create a SharePoint site using the REST API.  Here’s a fully baked example:

<!--
    SiteRequestForm.html: Collect information and create a site for the user.
-->

<mərkəz>
<masa>
    <tr>
        <TD>Site Name:</TD>
        <TD><giriş növü="text" ad="SiteName" id="SiteName" /></TD>
    </tr>
    <tr>
        <TD colspan="2">
            <giriş növü="submit" id="CreateSiteButton" dəyər="Create the Site" />
        </TD>
    </tr>
</masa>
</mərkəz>

<ssenari src="../Plugins/jquery-1.11.0.min.js"></ssenari>

<ssenari>
oldu CreateSiteLogicContainer = {

    createSiteData: {
            "parameters": {
                __metadata: { "type": "SP.WebInfoCreationInformation" },
                Url: "Paultest1",
                Title: "Paultest1",
                Təsvir: "rest-created web by Paul!",
                Dil: 1033,
                WebTemplate: "sts",
                UseUniquePermissions: saxta
            }
    },

    createSite: funksiyası () {

        jQuery.support.cors = doğru;

        CreateSiteLogicContainer.createSiteData.parameters.Url = $("#SiteName").val();
        
        $.ajax({
            url: "https://bigapplesharepoint.sharepoint.com/NBAIADev/_api/web/webinfos/add",
            üsul: "POST",

            headers: {
                "Accept": "application/json; odata=verbose",
                "content-type": "application/json;odata=verbose",
                "X-RequestDigest": $("#__REQUESTDIGEST").val()
            },

            məlumat: JSON.stringify(CreateSiteLogicContainer.createSiteData),

            success: funksiyası () { zirək("success"); },
            səhv: funksiyası () { zirək("error"); }

        });
    },

    wireUpForm: funksiyası () {
        $("#CreateSiteButton").basın(funksiyası () {
            zirək("About to try and create the site.");
            CreateSiteLogicContainer.createSite();
        });
    }


}

CreateSiteLogicContainer.wireUpForm();

</ssenari>

When successful, you get a JSON packet in response like this:

My key thoughts and learnings from this include:

• This approach uses jQuery.  Mənə gəldikdə isə, my jQuery library is located in “../plugins.”  You’ll want to change that to point to your favorite JQ location.
• You can copy and paste that whole snippet into a Content Editor Web Part on a page and it should work just fine.  You’ll want to change the end point of the API call and make sure you reference JQ correctly.
• The URL is relative to your API’s endpoint.  Mənə gəldikdə isə, it’s creating sub-sites underneath https://bigapplesharepoint.com
• You don’t need to provide a content-length. Some blog posts and MSDN document implies that you do, but happened for me automatically, which I assume is being handled by the $.ajax call itself.
• This line is required in order to avoid a “forbidden” response: "X-RequestDigest": $("#__REQUESTDIGEST").val().  There are other ways to do it, but this is pretty nice.  I have lost the link to blog that provided this shortcut.  H/T to you, mysterious blogger!

Good luck and hope this helps someone out.

</son>

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