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C#, I have an Automobile class and in that class i have a vehicleTrim field.
I use JsonConvert.SerializeObject to serialize that class and it is not escaping the single quote.
This is causing an issue when i try to set the value of an object in the web via window.localStorage.setItem function.

example:

public class Automobile

 public string vehicleTrim get; set; 


var test = new Automobile()

 vehicleTrim = "designer's package"
;

var serialized = JsonConvert.SerializeObject(test, Formatting.None);
// serialized output: "vehicleTrim":"designer's package"
// expected output : "vehicleTrim":"designer's package"

so now i want to set this json object to the localstorage of my web by calling this

var jsSetScript = $"window.localStorage.setItem('automobile', 'serialized');";
await Control.EvaluateJavascriptAsync(jsSetScript);

EvaluateJavascriptAsync returns this error trying to read the json SyntaxError: Unexpected identifier 's'. Expected ')' to end an argument list.

I manaully tried this with the escaped single quote and it was fine. So the question is how can i make serializedobject method escape the single quote?

"'" is not even a valid JSON string literal. From the JSON spec:

Thus ' does not need to be escaped, but if it is, it must appear as "u0027". Only the 8 listed characters have a special, abbreviated escaping syntax. (For further details see RFC 8259.)

If "u0027" meets your needs, then setting JsonSerializerSettings.StringEscapeHandling to StringEscapeHandling.EscapeHtml should do the trick. From the docs:

StringEscapeHandling Enumeration

Specifies how strings are escaped when writing JSON text.

Default 0 Only control characters (e.g. newline) are escaped.
EscapeNonAscii 1 All non-ASCII and control characters (e.g. newline) are escaped.
EscapeHtml 2 HTML (<, >, &, ', ") and control characters (e.g. newline) are escaped.

Thus the following now succeeds:

var settings = new JsonSerializerSettings

 StringEscapeHandling = StringEscapeHandling.EscapeHtml,
;
var serialized = JsonConvert.SerializeObject(test, Formatting.None, settings);

Console.WriteLine(serialized);
// Outputs "vehicleTrim":"designeru0027s package"

Assert.IsTrue(!serialized.Contains(''')); 
// Succeeds

Demo fiddle here.