Validate a string to be json or not in asp.net

is there any way to validate a string to be json or not ? other than try/catch .

I’m using ServiceStack Json Serializer and couldn’t find a method related to validation .

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Answers:

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Method 1

Probably the quickest and dirtiest way is to check if the string starts with ‘{‘:

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

Another option is that you could try using the JavascriptSerializer class:

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

Or you could have a look at JSON.NET:

Method 2

A working code snippet

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

Source

Method 3

You can find a couple of regular expressions to validate JSON over here: Regex to validate JSON

It’s written in PHP but should be adaptable to C#.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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