How Can I Efficiently Verify JSON String Validity Using JSON.NET or System.Json?

Efficient way to ensure the validity of JSON strings: JSON.NET and System.Json

In data processing, it is crucial to verify that the original string is valid JSON. Both JSON.NET and System.Json provide reliable solutions.

Code implementation:

The most reliable way is to use JSON.NET's JToken.Parse method and nest it within a try-catch block. This allows parsing the string and catching any exceptions indicating the JSON is invalid.

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

private static bool IsValidJson(string strInput)
{
    if (string.IsNullOrWhiteSpace(strInput)) { return false; }
    strInput = strInput.Trim();
    if ((strInput.StartsWith("{") && strInput.EndsWith("}")) || // 对象
        (strInput.StartsWith("[") && strInput.EndsWith("]"))) // 数组
    {
        try
        {
            var obj = JToken.Parse(strInput);
            return true;
        }
        catch (JsonReaderException jex)
        {
            // 解析异常
            Console.WriteLine(jex.Message);
            return false;
        }
        catch (Exception ex)
        {
            // 其他异常
            Console.WriteLine(ex.ToString());
            return false;
        }
    }
    else
    {
        return false;
    }
}

The

namespace of System.Json.NET Framework 4.5 also provides the JsonValue.Parse method:

using System.Runtime.Serialization.Json;

string jsonString = "someString";
try
{
    var tmpObj = JsonValue.Parse(jsonString);
}
catch (FormatException fex)
{
    // 无效的JSON格式
    Console.WriteLine(fex);
}
catch (Exception ex)
{
    // 其他异常
    Console.WriteLine(ex.ToString());
}

No code required:

For smaller JSON strings, you can use online tools such as JSONLint and JSON2CSharp to verify their validity and generate template classes for deserialization.

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