n8n Workflow Automation for .NET Developers

What is n8n?

n8n is an open-source workflow automation tool (like Zapier but self-hosted). It connects 400+ services and can be triggered by webhooks from your .NET app.

Sending a Webhook from .NET

public class WebhookService(HttpClient http, IConfiguration config)
{
    public async Task NotifyPostPublishedAsync(BlogPost post)
    {
        var url = config["N8n:WebhookUrl"];
        await http.PostAsJsonAsync(url, new
        {
            event = "post.published",
            post.Title, post.Slug,
            url = $"https://mysite.com/blog/{post.Slug}"
        });
    }
}

n8n Workflow: Auto-Tweet on Publish

1. Webhook trigger — receives POST from .NET
2. Twitter node — posts tweet with title + URL
3. LinkedIn node — shares post on LinkedIn
4. Email node — sends newsletter to subscribers

HMAC Webhook Security

var signature = Convert.ToHexString(
    HMACSHA256.HashData(Encoding.UTF8.GetBytes(secret),
    Encoding.UTF8.GetBytes(body)));
if (signature != request.Headers["X-Signature"]) return Unauthorized();