How Can I Validate JSON Strings Using JSON.NET and Other Methods?

Use JSON.NET to validate JSON strings

JSON.NET provides multiple methods to verify whether a string is valid JSON data.

Use try-catch block:

A common approach is to parse the string in a try-catch block:

<code class="language-csharp">try
{
   var obj = JToken.Parse(strInput);
   // 解析成功，JSON 有效。
}
catch (JsonReaderException ex)
{
   // 捕获异常，JSON 无效。
}
catch (Exception ex)
{
   // 其他异常，根据情况处理。
}</code>

Check the starting and ending characters:

Additionally, you can check if a string starts with "{" or "[" and ends with "}" or "]" respectively:

<code class="language-csharp">private static bool IsValidJson(string strInput)
{
   if ((strInput.StartsWith("{") && strInput.EndsWith("}")) ||
      (strInput.StartsWith("[") && strInput.EndsWith("]")))
   {
      try
      {
         var obj = JToken.Parse(strInput);
         return true;
      }
      catch
      {
         return false;
      }
   }
   return false;
}</code>

Use the System.Json namespace (no JSON.NET required):

If you don't want to use JSON.NET, you can use the System.Json namespace:

<code class="language-csharp">try
{
   var tmpObj = JsonValue.Parse(jsonString);
   // JSON 有效。
}
catch
{
   // JSON 无效。
}</code>

Non-code methods:

For smaller JSON strings, if you prefer manual validation, you can:

• Use online tools, such as JSONLint, to check validity.
• Copy a valid JSON string to JSON2csharp.com, generate a class template, and deserialize using JSON.NET.

The above is the detailed content of How Can I Validate JSON Strings Using JSON.NET and Other Methods?. For more information, please follow other related articles on the PHP Chinese website!