How Can I Validate JSON Strings Using JSON.NET or Alternative Methods?

Use JSON.NET to verify the validity of JSON string

Ensuring that the string is in valid JSON format is critical for data integrity. The popular JSON processing library JSON.NET provides several methods to validate JSON strings.

Use TryParse or JToken.Parse

Unfortunately, JSON.NET lacks the TryParse method. However, you can utilize JToken.Parse in a try-catch block:

private static bool IsValidJson(string strInput)
{
    if (string.IsNullOrWhiteSpace(strInput)) { return false; }
    strInput = strInput.Trim();
    try
    {
        var obj = JToken.Parse(strInput);
        return true;
    }
    catch (JsonReaderException)
    {
        return false;
    }
    catch (Exception)
    {
        return false;
    }
}

Additional checks for object and array structures

To improve the accuracy of verification, the following additional checks may be considered:

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)
        {
            return false;
        }
        catch (Exception)
        {
            return false;
        }
    }
    else
    {
        return false;
    }
}

Alternatives that don’t require JSON.NET

If you are unable to use JSON.NET, consider using the System.Json namespace in .NET:

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

Please remember that this method requires the System.Json NuGet package to be installed.

Non-code approach

For quick validation of small JSON strings, you can use online tools such as JSONLint. They can identify JSON syntax errors and provide helpful feedback.

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