Why Am I Getting an 'Unexpected token o' Error When Parsing JSON in JavaScript?

Unexpected Token 'o' in JavaScript

In this tutorial, the aim is to load vocabulary from a JSON file into an HTML table. However, the process hit a roadblock with the error "Uncaught SyntaxError: Unexpected token o."

The error points to the line:

var glacier = JSON.parse(data);

In the provided code, jQuery's $.get() method is used to retrieve the JSON file. However, a crucial detail was overlooked: $.get() attempts to guess the data type. In this case, it incorrectly assumes the data is JSON and initiates the parsing process even though $.getJSON() is not explicitly called.

When the code then attempts to manually parse the JSON with JSON.parse(), the unexpected token error occurs. To resolve this issue, explicitly specify the data type in the $.get() method using the dataType option. This ensures that jQuery correctly handles the data as JSON, eliminating the unexpected token error.

For instance, the code can be modified as shown below:

jQuery.get('wokab.json', function(data) {
  var glacier = JSON.parse(data);
}, 'json');

By adding the 'json' parameter to the $.get() method, jQuery will unambiguously interpret the response as JSON, preventing the unexpected token error and enabling the successful loading of vocabulary into the table.

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