Minimal APIs vs Controllers in ASP.NET Core: Which to Use in 2026
The way we build APIs in .NET has shifted. For years, MVC controllers were the only serious option for an ASP.NET Core Web API. Minimal APIs changed that, and by 2026 they are a first-class, fully supported way to ship production services - not a toy for demos. The honest question is no longer "are minimal APIs good enough" but "which model fits this service." This comparison lays out where each one wins, the trade-offs that actually matter at scale, and a clear recommendation at the end.
If you want to see both styles wired into one complete, runnable codebase - with validation, auth, EF Core, and testing already connected - the full source is on Patreon, so you can compare the two approaches side by side instead of from snippets. And because the controllers-versus-minimal-APIs decision is exactly where most teams get stuck, Chapter 1 of the ASP.NET Core Web API: Zero to Production course walks through that choice inside a real project, alongside a clean Program.cs, the options pattern, and your first endpoints - so the decision is grounded in a working API rather than opinion.
What Are Minimal APIs and Controllers?
Controllers are the classic MVC model: classes that inherit from ControllerBase, attribute-based routing, action methods, model binding, filters, and a well-trodden convention for organising large surface areas of endpoints. They have been the backbone of ASP.NET Core APIs since the start and carry a deep ecosystem of tooling and documentation.
Minimal APIs, introduced in .NET 6 and steadily hardened since, let you define endpoints directly against the WebApplication using lambda-based handlers and route groups. There is no controller class and no convention overhead - you map a route to a handler and rely on dependency injection, parameter binding, and the same underlying pipeline. By .NET 8 and later they gained the features that earlier made controllers the default: filters, typed results, better OpenAPI support, and [AsParameters] binding.
Minimal APIs vs Controllers: Side-by-Side
| Factor | Minimal APIs | Controllers |
|---|---|---|
| Boilerplate | Very low - route plus handler | Higher - class, attributes, conventions |
| Startup / overhead | Slightly leaner, less reflection | Marginally heavier, rarely the bottleneck |
| Organisation at scale | Needs discipline (route groups, modules) | Strong built-in convention for many endpoints |
| Filters & cross-cutting | Endpoint filters (.NET 7+) | Mature action filters, model-level conventions |
| Model binding & validation | Lightweight; richer with [AsParameters] |
Full, familiar model-binding stack |
| OpenAPI / Swagger | Good, improving each release | Long-established, very rich |
| Learning curve | Gentle for new endpoints | More concepts up front |
| Best fit | Microservices, focused APIs, lean services | Large, convention-heavy enterprise APIs |
When to Use Minimal APIs
Minimal APIs shine when the service is focused and you want to keep ceremony out of the way:
- Microservices and serverless - small surface area, fast cold starts, less infrastructure to reason about.
- Lightweight or internal APIs - a handful of endpoints where a full controller layer is pure overhead.
- New services where the team is comfortable imposing its own structure - route groups and endpoint modules keep things tidy without conventions doing it for you.
The performance edge is real but usually modest: fewer layers and less reflection mean a leaner pipeline, which matters most for high-density, latency-sensitive services. For most apps it is a tie-breaker, not the deciding factor.
When to Use Controllers
Controllers remain the stronger default when structure and consistency carry more weight than line count:
- Large enterprise APIs with dozens or hundreds of endpoints, where a shared convention keeps the codebase navigable across a big team.
- Heavy cross-cutting requirements that lean on the mature action-filter and model-binding ecosystem.
- Teams and tooling already invested in MVC - the migration cost rarely pays for itself on an existing, healthy API.
Crucially, "controllers" is not a synonym for "legacy." A well-organised controller-based API is still an excellent, fully supported choice in 2026.
The Real-World Trade-offs
The trade-off that bites teams is not performance - it is organisation. Minimal APIs give you a blank page, and a blank page scales only as well as the discipline behind it. I have seen a minimal-API service grow into a single 1,500-line Program.cs because nobody set up route groups early. Controllers prevent that failure mode by handing you a convention, at the cost of more upfront structure for small services.
The second trade-off is feature parity over time. Early minimal APIs genuinely lacked things controllers had. That gap has largely closed - endpoint filters, typed results, and improved OpenAPI mean most teams will not hit a wall. Check the specific feature you depend on against the version you target, but assume parity unless proven otherwise.
If you are weighing a third option, FastEndpoints vs Controllers vs Minimal APIs covers a structured middle ground, and the .NET 10 Minimal APIs enterprise adoption playbook goes deeper on scaling minimal APIs without losing structure. Microsoft's minimal APIs overview is the authoritative feature reference.
Performance: What the Numbers Actually Say
It is easy to oversell the speed angle, so here is the honest version. Minimal APIs avoid some of the controller activation and convention machinery, which trims a little per-request overhead and shaves startup time. In published benchmarks the throughput gap is real but narrow, and for a typical API the bottleneck is your database, downstream calls, and serialization - not the endpoint model. The startup difference matters most in serverless and autoscaling scenarios where cold starts are billed and felt. If you are choosing between the two to win a latency budget, measure your own workload first; the framework choice is rarely where the milliseconds are hiding.
Tooling, Testing, and OpenAPI
Both models produce standard ASP.NET Core endpoints, so integration testing with WebApplicationFactory works identically for either - you exercise the running pipeline, not the handler shape. For OpenAPI, controllers have the longer history and the richest annotations, while minimal APIs reach the same documentation quality through WithOpenApi, typed results, and metadata extensions. The practical takeaway: tooling parity is close enough that it should not be the deciding factor for a greenfield service, though a controller-heavy team with deep Swagger customisation may find the familiar path smoother. If you want to pressure-test your understanding of both before an interview or a design review, the ASP.NET Core Minimal API interview questions are a good gauge.
Recommendation
For a new, focused service or microservice in 2026, start with minimal APIs - the reduced ceremony is a genuine advantage, and the feature gap that once justified controllers is effectively gone. For a large API with many endpoints, a big team, or heavy reliance on the MVC filter ecosystem, controllers remain the safer default because the built-in convention pays for itself in consistency. And if you already run a healthy controller-based API, the right move is almost always to leave it alone - the rewrite is rarely worth it. Pick based on the service's size and your team's appetite for structure, not on which one is newer.
FAQ
Are minimal APIs faster than controllers in .NET? Slightly. Minimal APIs use less reflection and fewer pipeline layers, so they have marginally lower overhead and faster startup. For most applications the difference is small enough that it should not drive the decision - choose on structure and team fit, and treat the performance edge as a tie-breaker for latency-sensitive, high-density services.
Are controllers deprecated in favour of minimal APIs? No. Controllers are fully supported and actively maintained, and they remain the recommended approach for large, convention-heavy APIs. Minimal APIs are an additional model, not a replacement, and Microsoft maintains both.
Can I mix minimal APIs and controllers in the same project? Yes. A single ASP.NET Core app can register controllers and map minimal-API endpoints at the same time. A common pattern is keeping a large existing controller surface while adding new lightweight endpoints as minimal APIs.
Do minimal APIs support filters and validation? Yes. Endpoint filters arrived in .NET 7 and cover most cross-cutting needs, and parameter binding plus [AsParameters] handles model binding. Validation is lighter than the controller stack out of the box, but you can plug in FluentValidation or endpoint filters to get equivalent behaviour.
Which should a new team choose in 2026? For a new, focused service, start with minimal APIs and impose structure with route groups from day one. For a large enterprise API with many endpoints and a big team, controllers give you a convention that keeps the codebase consistent. Match the choice to the size of the service and how much structure your team wants enforced for them.
About the Author
Celin Daniel is Co-founder of Coding Droplets with 13+ years of hands-on experience designing and shipping .NET and ASP.NET Core APIs in production. The organisation trade-offs above come from building real services in both styles, not from benchmarks alone.
- Website: codingdroplets.com
- GitHub: github.com/codingdroplets
- YouTube: youtube.com/@CodingDroplets
