dotnet add package Microsoft.AspNetCore.Authentication.JwtBearer

"JwtOptions": {
 "Issuer": "https://localhost:5001",
 "Audience": "https://localhost:5001",
 "SecurityKey": "1G3l0yYGbOINId3A*ioEi4iyxR7$SPzm"
}

public static AuthenticationBuilder AddJwtBearer(this IServiceCollection services, Action<JwtOptions> configureOptions)
{
 if (configureOptions == null) throw new ArgumentNullException(nameof(configureOptions));

 var jwtOptions = new JwtOptions()
 {
  Issuer = "Jwt Authentication",
  Audience = "Wilson Pan Web Api",
 };
 // set customs optoins
 configureOptions(jwtOptions);

 // update Options 
 services.PostConfigure<JwtOptions>(options =>
 {
  options.Issuer = jwtOptions.Issuer;
  options.Audience = jwtOptions.Audience;
  options.SecurityKey = jwtOptions.SecurityKey;
 });

 return services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
     .AddJwtBearer(options =>
     {
      options.TokenValidationParameters = new TokenValidationParameters()
      {
       ValidIssuer = jwtOptions.Issuer,
       ValidAudience = jwtOptions.Audience,
       ValidateIssuer = true,
       ValidateLifetime = true,
       ValidateIssuerSigningKey = true,
       IssuerSigningKey = jwtOptions.SymmetricSecurityKey
      };
     });

}

services.AddJwtBearer(options =>
{
 options.Issuer = Configuration.GetValue<string>("JwtOptions:Issuer");
 options.Audience = Configuration.GetValue<string>("JwtOptions:Audience");
 options.SecurityKey = Configuration.GetValue<string>("JwtOptions:SecurityKey");
});

app.UseAuthentication();
app.UseAuthorization();

//define claim 
var claims = new Claim[]
{
  new Claim(ClaimTypes.Name, username),
  new Claim(ClaimTypes.Email, $"{username}@github.com"),
  new Claim(ClaimTypes.Role, username == "WilsonPan" "Admin" : "Reader"),
  new Claim(ClaimTypes.Hash, JwtHashHelper.GetHashString($"{username}:{password}:{System.DateTime.Now.Ticks}")),
};

//define JwtSecurityToken
var token = new JwtSecurityToken(
  issuer: _jwtOptions.Issuer,
  audience: _jwtOptions.Audience,
  claims: claims,
  expires: System.DateTime.Now.AddMinutes(5),
  signingCredentials: _jwtOptions.SigningCredentials
);

// generate token
var result = new JwtSecurityTokenHandler().WriteToken(token);

[ApiController]
[Authorize]
[Route("[controller]")]
public class ApiController : ControllerBase
{
  ...
}

[HttpPost]
[Authorize(Roles = "Admin")]
public IActionResult Post()
{
  return Ok();
}

dotnet run

@host = https://localhost:5001

# @name token
POST {{host}}/Authorize HTTP/1.1
Content-Type: application/x-www-form-urlencoded

#username=Wilson&password=123456
# admin 
username=WilsonPan&password=123456

### required authorize
GET {{host}}/api HTTP/1.1
Authorization: Bearer {{token.response.body.*}}

### required authorize
POST {{host}}/api HTTP/1.1
Authorization: Bearer {{token.response.body.*}}