getting error "could not open extension control file "

Question

I am trying to run this function but getting error

 CREATE EXTENSION plv8;

    CREATE OR REPLACE FUNCTION test_func(data json) RETURNS json AS $$
      return JSON.stringify(data);
    $$ LANGUAGE PLV8;

here is my code

http://sqlfiddle.com/#!17/67b79/11

is there any way or any other online editor where I will run this code

Answer 1

Probably you have not installed a plv8 extension. Before execution the CREATE EXTENSION command, you should to install extension on server. This extension is not in standard package postgresql-contrib and then there is small chance so this extension is installed on server by default.