.NET API Security | Best Practices

Ibrahim Jaber
3 min readApr 23, 2023

As a developer, ensuring the security of your API is crucial to protect sensitive data and prevent unauthorized access. With the release of .NET , Microsoft has introduced some changes to the way APIs are configured and secured. In this blog, we will explore best practices for securing your .NET API, with practical examples along the way.

Use HTTPS for Secure Communication

Enabling HTTPS ensures that all communication between the client and the server is encrypted, protecting the data from interception and tampering. In .NET , you can configure HTTPS in the Program.cs file using the UseKestrel method, as shown in the example below:

using Microsoft.Extensions.Hosting;

var builder = WebApplication.CreateBuilder(args);

// Configure HTTPS
builder.WebHost.UseKestrel(options =>
{
options.ListenAnyIP(5000, listenOptions =>
{
listenOptions.UseHttps("path/to/ssl/certificate.pfx", "password");
});
});

var app = builder.Build();

// ...

Implement Authentication and Authorization

Authentication and authorization are essential to ensure that only authenticated and authorized users can access your API. In .NET, you can configure authentication and authorization using the AddAuthentication and AddAuthorization methods, as shown in the example below:

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;

// ...

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddJwtBearer(options =>
{
options.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuer = true,
ValidateAudience = true,
ValidateLifetime = true,
ValidateIssuerSigningKey = true,
ValidIssuer = "your_issuer",
ValidAudience = "your_audience",
IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("your_secret_key"))
};
});

builder.Services.AddAuthorization();

var app = builder.Build();

// ...

Implement Input Validation

Input validation is crucial to prevent malicious data from being processed by your API. In .NET , you can configure input validation using the AddMvc options and by adding validation attributes to your model classes, as shown in the example below:

using…

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Ibrahim Jaber

Software developer | Programming and Blockchain enthusiast | If you'd like to buy me coffee: https://ko-fi.com/ibrahimjaber