I need to do authentication for WCF Services using JWT

BUT we need NOT to depend on any framework.

Angular IS a framework.

All JWT's are, are encoded tokens that you store in local storage and pass back with each http request to the server.

You can use JWT's or you can create your own token.

When user logs on - create a random token and assign to that user.
Return the token as part of the login process.
On the client store the token in localStorage (or a cookie)
If using localStorage then add an AngularJS method to preprocess outgoing http requests - in there you add the token to your header using the Authorization key
On the server you check for that Authorization header - extract the token and match it against your user base - if there is a match the user is authenticated.

Could you please share code, configurations ...

angular.module('app').config(['$httpProvider', ($httpProvider) ->
  $httpProvider.interceptors.push(function($q, dependency1, dependency2) {
    return {
      request: function (config) {
        config.headers = config.headers || {};
          var token = localStorage.getItem('token');
          if (token) {
            config.headers.Authorization = 'Bearer' + token; // see note below (**)
          }
          return config;
        },
      };
  })
])

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**  assuming you are using a Bearer token header - there are many ways of passing this value - you decide how you want to pass it and how you want to receive it (assuming you are in control of the server process.

The above code demonstrates how to add a token to the header of each outgoing http request.

As part of your login process you store the token in local storage.

Could you please share the code of server side (C#)?

Unfortunately I cannot - I work primarily with JavaScript frameworks and have little .Net experience on Web (lots on Forms and WPF - but not much on the web side)

However this is a very very very common requirement - you should be able to find a significant amount of information on how to do this through a google search.

Search for
C# Authorization bearer token
as a start

Thanks Julian,

Will do google search, and waiting for other experts to comment.

we have some projects using JWT authentication in .NET recently but I can't really share the source codes with you as it was done by the engineer from my company's business partner.

However, I do believe we are referring to https://jwt.io/ where the solutions were built based on the  .NET libraries that mentioned in that website.

Could someone provide me guidance on integrating JWT in my backend server?

Did you try searching
C# JWT

I found many articles such as this one
https://stackoverflow.com/questions/40281050/jwt-authentication-for-asp-net-web-api

Then there is JWT home https://jwt.io/

There are many code examples out there on how to integrate JWT into C# - it is not feasible to recreate those examples here. What will work better is for you to look at what is online and try to implement and then come back here with specific problems you are having, posting code.