How to check if I run JavaScript code in a browser or not in a browser? -


How to check if I run this code in a browser or not in the browser? I have something like this 

  var x = 5; If (/ * inside a browser * /) document.write (x); Else / * without browser * / console.log (x); = 'Undefined') (/ => unchangeable)    
 
 
  / I I am inside the environment; And {// am elsewhere (server?)}

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