Newtonsoft JSON package missing after moving project?

[WavyRancheros]

Not sure where to put this.
I moved my project folder from one laptop to another.
Now I am getting errors that the Newtonsoft namespace could not be found.

I did not have any Newtonsoft folders in my project, so I guess it must have been in the packages?
But I tried to re-add Newtonsoft JSON as a package, but I can’t find it in the package manager?

Can anyone help?

[MadeFromPolygons1]

It is now included as part of unity, add their package instead of the newtonsoft one

https://docs.unity3d.com/Packages/com.unity.nuget.newtonsoft-json@3.0/manual/index.html

[WavyRancheros]

How can I add it?

I can’t find it in the package manager.

[MadeFromPolygons1]

@WavyRancheros

How can I add it?

I can’t find it in the package manager.

You can add it via package manager using “com.unity.nuget.newtonsoft-json@3.0” or “com.unity.nuget.newtonsoft-json”, if unsure how to do that I suggest reading up on the different ways to add packages to package manager:

https://docs.unity3d.com/Manual/upm-ui-quick.html

Good luck

[WavyRancheros]

Thank you!

[jeancallisti]

Forgive me, I don’t understand what any of that means. I’m fairly new to Unity.

What I tried:
1. With Visual Studio

• Opened the Unity solution (.sln file) in Visual Studio
• Opened the Package Manager in Visual Studio
• Added Newtonsoft.Json.
  => When I rebuild the solution in VS, no errors
  => Then, when I rebuild in Unity, it seems to ignore the package.
  Failure.

2. With Unity’s Package Manager, by searching
(I’m using Unity 2021.3.29f1)

• Open unity’s Package Manager (Window → Package Manager)
• It starts with the dropdown set to “Packages: In Project”. I type “json” in the search bar → no result
• I change the dropdown to “Packages: Unity registry”. I type “json” in the search bar. → no results
• I change to “Packages: Built-in”. I type “json” in the search → I find “JSONSerialize”. that’s no good because that’s a different Json utility meant for Unity classes, not Newtonsoft.

2. With Unity’s Package Manager, by entering package name explicitly

• Still in Unity’s Package Manager

Attempt #1:

• Click on the “+” button. Select “Update package by name…”
• Enter “com.unity.nuget.newtonsoft-json@3.0” → Error in the unity console “Cannot find a version of package [com.unity.nuget.newtonsoft-json] compatible with this Unity version (2021.3.29f1)”

Attempt #2:

• Click on the “+” button. Select “Add package from git url…”

• Now I’m looking for the url. I open Newtonsoft Json Unity Package | Newtonsoft Json | 3.0.2 . There, there’s no link to the actual package. Only a link to the original Newtonsoft project repo, from which Unity forked. I try anyways: I use “GitHub - JamesNK/Newtonsoft.Json: Json.NET is a popular high-performance JSON framework for .NET” as a url. → Unsurprisingly, Unity says that there’s no package at that address.

• I try again with url “https://www.nuget.org/api/v2/package/Newtonsoft.Json/13.0.3” from which I can download the nupkg file manually. Unity still rejects that url.

How do you add basic Json deserialization to Unity?
By the way I also tried System.Text.Json but since Unity targets an older version of .Net it’s not available.

[jeancallisti]

I finally managed… I was so close!

• Open unity’s Package Manager (Window → Package Manager)
• Click on the “+” button. Select “Update package by name…”
• Enter com.unity.nuget.newtonsoft-json (just as MadeFromPolygons suggested… Tricked by my ADD again :-/ )
• The package gets installed
• Then in the C# file :

using Newtonsoft.Json;

Unity rebuilds. Success.

[BrighturaStudios]

@jeancallisti

I finally managed… I was so close!

• Open unity’s Package Manager (Window → Package Manager)
• Click on the “+” button. Select “Update package by name…”
• Enter com.unity.nuget.newtonsoft-json (just as MadeFromPolygons suggested… Tricked by my ADD again :-/ )
• The package gets installed
• Then in the C# file :

using Newtonsoft.Json;

Unity rebuilds. Success.

Thanks for this response! You’re awesome.

[Guillaumzed]

@jeancallisti

I finally managed… I was so close!

• Open unity’s Package Manager (Window → Package Manager)
• Click on the “+” button. Select “Update package by name…”
• Enter com.unity.nuget.newtonsoft-json (just as MadeFromPolygons suggested… Tricked by my ADD again :-/ )
• The package gets installed
• Then in the C# file :

using Newtonsoft.Json;

Unity rebuilds. Success.

thanks so much !

[jackielash25]

@jeancallisti

I finally managed… I was so close!

• Open unity’s Package Manager (Window → Package Manager)
• Click on the “+” button. Select “Update package by name…”
• Enter com.unity.nuget.newtonsoft-json (just as MadeFromPolygons suggested… Tricked by my ADD again :-/ )
• The package gets installed
• Then in the C# file :

using Newtonsoft.Json;

Unity rebuilds. Success.

Thank you so much! U saved me

[karl_jones]

Please use the like button to show appreciation instead of necro posting.
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