information saved as a backward slash in the JavaScript console

This is the JavaScript code I've written:

add = document.getElementById("add");
add.addEventListener("click", () => {
  console.log("Updating List...");
  tit = document.getElementById("title").value;
  desc = document.getElementById("description").value;
  if (localStorage.getItem("itemsJson") == null) {
    itemJsonArray = [];
    itemJsonArray.push([tit, desc]);
    localStorage.setItem("itemsJson", JSON.stringify(itemJsonArray));
  }
});

The expected data should be [ABCD, XYZ], but it is currently displaying

"[[\"\",\"\"]]"
.

Answer №1

The presence of backslashes is intentional in this case. What you are observing is a JSON encoded value where the double quotes within the string are being escaped. For example:

"This \"string\" value contains quotes"
.

JavaScript is capable of reconstructing the original data structure from this string (as evident from the values indicated in your comments).

var items = localStorage.getItem("itemsJson");  
\\ items[0] value is "s"
\\ items[1] value is "d"

The same outcome can be achieved by writing the following line of code:

 var items = "[[\"s\",\"d\"]]";

In the JSON string value, such as

"[[\"s\",\"d\"]]"
, the array containing the string values "s" and "d" is enclosed in quotes at the beginning and end. If the array also included a numerical value, say 1, the JSON encoded string would appear like this:

"[[\"s\",\"d\",1]]"

Executing the following line of code:

alert("This \"string\" value contains quotes");

Will display this message:

This "String" value contains quotes
, demonstrating the purpose of the backslashes.

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