_spPageContextInfo not found on the page



Add the following code to the page :

<!DOCTYPE html>
<%@ Page language="C#" %>
<%@ Register Tagprefix="SharePoint"
     Namespace="Microsoft.SharePoint.WebControls"
     Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Import Namespace="Microsoft.SharePoint" %>
<html>
<head>
</head>
<body>
    <form runat="server">
        <SharePoint:FormDigest ID="FormDigest1" runat="server"></SharePoint:FormDigest>
    </form>
</body>
</html>



You need to add the following code in case of JSOM:

<!DOCTYPE html>
<%@ Page language="C#" %>
<%@ Register Tagprefix="SharePoint" 
     Namespace="Microsoft.SharePoint.WebControls" 
     Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Import Namespace="Microsoft.SharePoint" %>
<html>
<head>
<meta name="WebPartPageExpansion" content="full" />
    <script src="/_layouts/15/1033/init.js"></script>
    <script src="/_layouts/15/MicrosoftAjax.js"></script>
    <script src="/_layouts/15/sp.core.js"></script>
    <script src="/_layouts/15/sp.runtime.js"></script>
    <script src="/_layouts/15/sp.js"></script>
 </head>
<body>
    <form runat="server">
        <SharePoint:FormDigest ID="FormDigest1" runat="server"></SharePoint:FormDigest>
    </form>
</body>
</html>


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