Confirm json string or not in asp.net

Question

Is there a way to check the string as json or not? except try / catch.

I am using ServiceStack Json Serializer and cannot find the method related to validation.

Answer 1

Probably the fastest and dirtiest way is to check if the line starts with '{' :

public static bool IsJson(string input){ input = input.Trim(); return input.StartsWith("{") && input.EndsWith("}") || input.StartsWith("[") && input.EndsWith("]"); } 

Another option is to try using the JavascriptSerializer class:

 JavaScriptSerializer ser = new JavaScriptSerializer(); SomeJSONClass = ser.Deserialize<SomeJSONClass >(json); 

Or you could take a look at JSON.NET:

• http://james.newtonking.com/projects/json-net.aspx
• http://james.newtonking.com/projects/json/help/index.html?topic=html/SerializingJSON.htm

Answer 2

Working code snippet

 public bool isValidJSON(String json) { try { JToken token = JObject.Parse(json); return true; } catch (Exception ex) { return false; } } 

Source

Answer 3

You can find a couple of regular expressions for checking JSON here: Regex for checking JSON

It is written in PHP, but must be adapted to C #.