After converting an array to JSON, I noticed that backslashes are added at the start and end. Why is this happening?
// Sample code
var myJSON = "";
var FinalResult = JSON.stringify(result);
myJSON = JSON.stringify({"result": FinalResult});
document.write(myJSON);
// Current Output
{"result":"[\"How are you?\"]"}
// Desired Output
{"result":"["How are you?"]"}
The issue arises from using JSON.stringify twice
var FinalResult = JSON.stringify(result);
This results in the string ["How are you?"]. When you create an object with {"result": FinalResult}, the string is simply placed in the result property. However, when you then
JSON.stringify({"result": FinalResult});
the string in FinalResult gets escaped.
If you only do
JSON.stringify({"result": result});
you will receive {"result":["How are you?"]}, which can be easily parsed back into an object with a property called result containing an array. On the other hand, if you continue to use JSON.parse as you currently have it, you will need to parse it twice to restore the original data.
When dealing with special characters like ", it's important to properly escape them in order to avoid any issues in the final output. If these characters are not needed, simply parse the string and substitute them with something else.
The reason for adding the '\' mark is that you already have a string stored in your JSON object called myJSON, and when using stringify function.
One approach to consider is placing each character into an array like this:
var myArray = ["Hello", "world"]; myArray.join().replace("," , " ");
After that, remember to stringify the array.
Best of luck on your coding journey!
One common application of this feature is inserting a single quotation mark (") within a text string.
The reason behind this issue is the double calling of JSON.stringify. Initially, you convert the variable result to JSON and store it in FinalResult, resulting in the JSON starting with literal " characters because it's a string.
Subsequently, you insert FinalResult into the object {result: FinalResult}, followed by another call to JSON.stringify on this new object. This necessitates escaping those double quotes so they are recognized as literals during parsing.
To resolve this issue, simply replace all instances of JSON.stringify with corresponding JSON.parse calls, ensuring everything functions correctly.
myObject = JSON.parse(myJSON);
newResult = JSON.parse(myObject.result);
The purpose of the backslash mark is to indicate to the interpreter that the double quotation mark is a part of the string and not the closing quotes.
Since JSON utilizes quotes to distinguish between keys and values, it is essential to differentiate between these two types of quotes.
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