Question

I have the following code:

$.ajax({type: 'get',
  mode: 'abort',
  dataType: 'json',
  url: 'http://localhost/1.php',
  data: {},
  success: function(res){
      alert(res);
  },
  timeout: 10000,
  error: function(XMLHttpRequest, textStatus, errorThrown){
    alert("ERROR L: " + textStatus + " (" + errorThrown + ")");
  }

});

PHP contains only {id:1} and that’s it.

When I try to parse the code as is, I get:

ERROR L: parsererror (SyntaxError: Unexpected token i)

from the error handler I have.

If I change to dataType:'html',

Everything works just fine. I am missing something here, probably very very small, what is it?

Answer 1

The property names in JSON must be quoted:

{"id": 1}

The JSON specification specifies each name to be of type string and defines type string as:

A string is a sequence of zero or more Unicode characters, wrapped
in double quotes, using backslash escapes. A character is
represented as a single character string.