How to setup Newtonsoft.Json

1. Open the Unity Editor and navigate to the Window menu.

2. Select Package Manager to open the Unity Package Manager.

3. Click on the + button at the top left of the window, and select "Add package by name...".

4. Paste com.unity.nuget.newtonsoft-json into the dialog box and click Add.

   
5. Unity will now download and install Newtonsoft.Json into your project.

Verify Installation:

• After installation, Newtonsoft.Json should appear in the list of packages in the Package Manager. You can also verify the package is correctly added to your project by checking the Packages folder in your Unity Project window.

• Ensure that the Newtonsoft.Json namespace is accessible by attempting to use it within your scripts. For example, you can try adding using Newtonsoft.Json; at the top of one of your C# script files to confirm it's recognized by Unity.