Issue encountered when using JSON.parse() on a serialized array retrieved from sessionStorage

For my project, I needed to store an array in sessionStorage and came across a helpful answer that guided me to this solution: Storing Objects in HTML5 localStorage

The process of storing the array using 

sessionStorage.setItem('flavors', JSON.stringify(flavors))
works great initially. However, when navigating through the app with the back and forward buttons, I encountered an error:

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

The error seems to vary based on the elements within the array.

To avoid the error, I ended up using:

  flavors = sessionStorage.getItem('flavors').split(",");

instead of JSON.parse(). Interestingly, the string appears normal when logged to the console:

chocolate,vanilla,strawberry

I'm puzzled as to what might be causing this error. Any insights?

javascriptarrayssingle-page-applicationback-buttonsession-storage

Answer №1

To successfully decode JSON data, the input string must adhere to the JSON format. For instance, utilizing the 

JSON.parse('["apple","banana","orange"]')
function will do the trick.

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