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// class
public class JwtSettings
{
	public string Secret { get; set; }
	public string Issuer { get; set; }
	public int TokenDurationInMinutes { get; set; }
}

// config file
"JwtSettings": {
    "Secret": "Ceci est la cle permettant d'encrypter les tokens JWTs emis par le serveur",
    "Issuer": "BacASable",
    "TokenDurationInMinutes": "1"
  }

// Strongly type
services.Configure<JwtSettings>(jwtSettingsSection);
var jwtSettings = jwtSettingsSection.Get<JwtSettings>();

services.AddSingleton(resolver => resolver.GetRequiredService<IOptions<JwtSettings>>().Value);

// get just values directly
Configuration["JwtSettings:Secret"];