JSON.parse localStorage unexpected end of input error

Question

This line

item = JSON.parse(localStorage["item"]);

caused an error in my console showing Uncaught SyntaxError: Unexpected end of input when my localstorage has no value? How do I resolve this issue? I know that empty string is not a valid json.

@PatrickEvans Thanks for clarify that, but how to resolve this issue? — Aaron Musktin
– Aaron Musktin, Commented Jun 1, 2015 at 2:47
Easy test to see if the string is empty first, if it is dont parse — Patrick Evans
– Patrick Evans, Commented Jun 1, 2015 at 2:47
@PatrickEvans localStorage["item"] !== "" ? JSON.parse(localStorage["item"]); correct? — Aaron Musktin
– Aaron Musktin, Commented Jun 1, 2015 at 2:49

Jon Edwards · Accepted Answer · 2015-06-01 02:49:57Z

0

if(localStorage["item"]){
  item = JSON.parse(localStorage["item"]);
}

answered Jun 1, 2015 at 2:49

Jon Edwards

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2 Comments

Jon Edwards Over a year ago

It will only assign the variable if the "item" key exists in localStorage. You may want to set item to null, or another value that is safe for your code, in the event the key doesn't exist (a ternary would be a clean way to do it).

Felix Kling Over a year ago

Code without an explanation is rarely helpful.

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