asp.net - Read web.config values from Javascript -

i want read app key web.config file via java script. web.config key read

<appsettings>       <add key="key1" value="value1" /> <appsettings> 

i include following inside java script function.

function evaluate() {     var key = '<%=configurationmanager.appsettings["key1"].tostring() %>';     alert(key); } 

however, end getting <%=configurationmanager.appsettings["key1"].tostring() %> in alert.

what missing?

the <%= => tag going execute if within .aspx file. if place within .js file, other text. in order code work, javascript posted have embedded within .aspx file.