Which Backend Framework Is Most Structured for Beginners? NestJS vs FastAPI vs Spring Boot vs Django

Mar 24, 2026

I spent three months learning FastAPI because everyone said it was “simple” and “beginner-friendly.” Six months later, I rewrote the entire application because I had created an unmaintainable mess. The problem wasn’t FastAPI - it was that no one told me beginners need structure more than simplicity.

The Problem: Freedom Can Be a Trap

When I started learning backend development, I did what most beginners do: I searched for “easiest backend framework” and picked the one with the least boilerplate. FastAPI looked perfect - clean syntax, minimal code, and automatic documentation. What could go wrong?

Everything.

my-api/
├── main.py           # Everything in one file initially
├── main.py.bak       # Then I added a backup
├── main_v2.py        # Then versioning got messy
├── utils.py          # Utility functions scattered
├── models.py         # Data models added later
└── config.py         # Configuration as an afterthought

# Where do services go? Your choice.
# How do you organize by feature? Your choice.
# What patterns should I follow? Good luck figuring it out.

I ended up with a codebase where:

Routes called the database directly
Business logic was scattered across files
No clear separation between layers
Every new feature required refactoring

The Reddit discussion on r/backend captured exactly what I experienced. One commenter put it bluntly: “FastAPI is the simplest/least bloated… It’s also the least opinionated, so it could be more difficult if you are new to this.”

Another response hit harder: “Once you work with [Express or FastAPI] for a bit, you’ll realize… building product grade applications means a lot of architectural design you have to decide yourself.”

The Insight: Structure vs Flexibility Spectrum

Here’s the key realization that changed my approach:

More Structured <-------------------------------------> More Flexible
Spring Boot --- NestJS --- Django --- FastAPI --- Express/Flask

Easier to learn patterns <-------------------------> Requires prior knowledge

Beginners don’t need freedom. They need guardrails. The best framework for learning isn’t the one with the fewest lines of code - it’s the one that teaches you the right patterns through its structure.

How Each Framework Handles Structure

Spring Boot: The Opinionated Teacher

When I finally tried Spring Boot, the difference was immediate. The framework enforces patterns from day one.

@RestController
@RequestMapping("/api/users")
public class UserController {

    private final UserService userService;  // Dependency injection - enforced

    public UserController(UserService userService) {
        this.userService = userService;  // Constructor injection required
    }

    @GetMapping("/{id}")
    public ResponseEntity&lt;User&gt; getUser(@PathVariable Long id) {
        return ResponseEntity.ok(userService.findById(id));
    }

    @PostMapping
    public ResponseEntity&lt;User&gt; createUser(@Valid @RequestBody CreateUserRequest request) {
        return ResponseEntity.ok(userService.create(request));
    }
}

@Service  // This annotation marks it as a service layer - pattern enforced
public class UserService {
    private final UserRepository userRepository;

    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public User findById(Long id) {
        return userRepository.findById(id)
            .orElseThrow(() -> new UserNotFoundException(id));
    }
}

The structure isn’t optional. Spring Boot forces you to:

Separate controllers from services
Use dependency injection
Follow layered architecture
Define clear interfaces

As the Reddit discussion noted: “Spring boot is most structured out of the box & in tutorials.” This is by design - the “opinionated defaults” philosophy means beginners can’t easily create spaghetti code.

NestJS: Angular’s Backend Cousin

NestJS takes a similar approach but with TypeScript and Angular-like patterns:

@Controller('users')
export class UsersController {
  constructor(private readonly usersService: UsersService) {}  // DI built-in

  @Get(':id')
  findOne(@Param('id') id: string) {
    return this.usersService.findOne(+id);
  }

  @Post()
  create(@Body() createUserDto: CreateUserDto) {
    return this.usersService.create(createUserDto);
  }
}

@Injectable()  // Decorator marks this as injectable
export class UsersService {
  constructor(
    @InjectRepository(User)
    private usersRepository: Repository&lt;User&gt;,
  ) {}

  findOne(id: number): Promise&lt;User&gt; {
    return this.usersRepository.findOne({ where: { id } });
  }
}

@Module({
  imports: [TypeOrmModule.forFeature([User])],
  controllers: [UsersController],
  providers: [UsersService],
})
export class UsersModule {}  // Module pattern ties everything together

The Reddit comment captured this well: “NestJS… intuitive structure and great support for databases like TypeORM.” If you know Angular, NestJS feels like coming home.

FastAPI: The Freedom That Became My Problem

Compare the structured frameworks above to what I initially wrote in FastAPI:

from fastapi import FastAPI

app = FastAPI()

@app.get("/users/{user_id}")
async def get_user(user_id: int):
    # Direct database access in route - no service layer
    user = await db.users.find_one({"id": user_id})
    return user

@app.post("/users")
async def create_user(user: UserCreate):
    # No validation separation, no service layer
    return await db.users.insert_one(user.dict())

# Where do services go? Your choice.
# How do you organize by feature? Your choice.
# What patterns should I follow? Good luck.

The framework gave me freedom. I used that freedom to create technical debt. Not because FastAPI is bad, but because I didn’t know what I didn’t know.

Django: Batteries Included but Heavy

Django provides structure through its MVT (Model-View-Template) pattern:

from django.views import View
from django.http import JsonResponse

class UserDetailView(View):  # Class-based views enforced
    def get(self, request, user_id):
        user = get_object_or_404(User, id=user_id)
        return JsonResponse({'name': user.name})

# Separate file for data layer - enforced by Django
class User(models.Model):
    name = models.CharField(max_length=100)
    email = models.EmailField(unique=True)

# Separate file for routing - enforced
urlpatterns = [
    path('users/&lt;int:user_id&gt;/', UserDetailView.as_view()),
]

Django’s structure is comprehensive but geared toward web applications, not pure APIs.

The Trade-offs I Learned the Hard Way

After trying each framework, here’s my honest assessment:

Framework	Structure	Learning Curve	When You’ll Struggle
Spring Boot	Highest	Medium-High	Java verbosity, DI concepts
NestJS	High	Low-Medium	Decorators pattern, over-engineering feeling
Django	High	Medium	Too much for simple APIs, Django-specific patterns
FastAPI	Low	Low (start) / High (scale)	Architecture decisions, team consistency

The hidden cost of “freedom” frameworks:

Time spent deciding folder structure - I spent days researching “best practices” that varied by article
Inconsistent patterns across projects - Every tutorial did things differently
Learning architecture through mistakes - I refactored three times
Team friction - When I joined a team, my solo-developer patterns didn’t fit

The hidden cost of “structured” frameworks:

Framework-specific concepts - Learning Spring annotations took time
Fighting conventions - Sometimes I wanted to do things “my way”
Heavier setup - More files, more configuration

But here’s the key: the structure costs are upfront and documented. The freedom costs are hidden and accumulate over time.

Common Mistakes I Made (So You Don’t Have To)

Mistake 1: Choosing Based on Hype

“FastAPI is fast and modern, so it must be better.”

Performance matters less than maintainability for beginners. A “slow” framework with good patterns beats a “fast” framework with spaghetti code.

Mistake 2: Equating Simple Code with Easy to Learn

“FastAPI has fewer lines, so it must be easier.”

Fewer lines means you write the structure yourself. That’s not easier - it’s more decisions you’re not qualified to make yet.

Mistake 3: Ignoring My Background

I was a JavaScript developer. NestJS would have leveraged my existing knowledge. Instead, I started from zero with Python.

Mistake 4: Skipping the Why

I followed tutorials without understanding patterns. When requirements changed, I was stuck.

My Recommendation Path

After all these mistakes, here’s what I’d tell my past self:

Assess your language background first - Pick a framework in a language you know
Choose the most structured option - Guardrails help beginners
Learn patterns through the framework - Let it teach you architecture
Explore alternatives later - Once you understand patterns, freedom becomes useful

For Absolute Beginners Prioritizing Structure: Spring Boot

Yes, the learning curve is steeper. Yes, Java is verbose. But you’ll learn industry-standard practices from day one. The Reddit consensus was clear: “something like nestjs and spring boot are opinionated and force you to do things a certain way which is great for real projects.”

For TypeScript/Frontend Developers: NestJS

If you know JavaScript/TypeScript, NestJS gives you Angular-like structure without learning a new language. Great balance of modern tooling and enforced architecture.

For Python Enthusiasts Building Web Apps: Django

The “batteries included” approach provides structure while keeping Python’s simplicity. Overkill for pure APIs, excellent for web applications.

For Experienced Developers Wanting Minimalism: FastAPI

Only choose this after you understand architectural patterns and can make informed decisions about structure. The freedom is valuable - once you know how to use it.

Final Words

The best framework for learning isn’t the one that lets you write the fewest lines of code. It’s the one that teaches you patterns you’ll use for the rest of your career. Structure feels restrictive at first, but it’s actually the fastest path to becoming a skilled developer.

I wish someone had told me this before I spent months creating technical debt. Now I’m telling you.

Final Words + More Resources

My intention with this article was to help others share my knowledge and experience. If you want to contact me, you can contact by email: Email me

Here are also the most important links from this article along with some further resources that will help you in this scope:

👨‍💻 Reddit Discussion - Best Backend Framework for Beginners
👨‍💻 Spring Boot Official Documentation
👨‍💻 NestJS Documentation
👨‍💻 FastAPI Documentation
👨‍💻 Django Documentation

Oh, and if you found these resources useful, don’t forget to support me by starring the repo on GitHub!