Yapper-cli :is a highly opinionated CLI tool

If you’ve ever started a new backend project, you know the routine: set up Express, configure Mongoose, wire TypeScript, add logging and error handling, scaffold controllers/services/routes, and repeat. It’s not hard : just boring. Worse, this repetitive work delays the one thing that matters: building product features.

I got tired of reinventing the same boilerplate over and over. So I built a CLI to fix it. It’s called yapper — a tool that generates a production-ready Express + Mongoose backend in seconds.

The problem: backend setup is repetitive

Every new project starts the same way:
- Create a folder, initialize npm
- Install dependencies
- Set up an Express server
- Configure MongoDB with Mongoose
- Write boilerplate for routes, controllers, services, and models
- Add error handling and logging
- Configure TypeScript and linting
- Organize a sensible folder structure
Even adding a simple “user” module usually meant writing 4–5 files manually.
The work is predictable but steals time and momentum from building features.

The idea: automate the boring parts Why not automate that predictable setup with a CLI that:

Generates a complete backend project out-of-the-box
Follows sensible, opinionated best practices
Lets you scaffold modules (users, posts, orders, etc.) instantly
Removes repetitive setup so you can focus on product logic instead

That idea became yapper.

What yapper does Yapper is an opinionated CLI that scaffolds production-ready Express + Mongoose applications with sensible defaults. With it you can:

Create a new backend project scaffolded with Express, Mongoose and TypeScript
Generate modules (models, controllers, services, routes) with a single command
Include built-in error handling, request validation hooks, and logging configuration
Produce a consistent folder structure so you don’t waste time deciding where files go
Ship a codebase you can use as the base for prototypes or production systems

Core features

Fast project creation: scaffold a working backend in seconds
Module generator: one command to create model + controller + service + route
TypeScript-ready: typed models and controllers from day one
Error handling & logging: opinionated defaults that are easy to customize
Mongoose integration: ready-to-use DB connection and example schemas
Configured folder structure: predictable layout for teams and long-term projects
Extensible: customize templates to match your preferred patterns

Example workflow

Create a new project:
```
yapper new my-backend
```
(This sets up package.json, TypeScript config, Express app, DB connection, logging and basic error handling.)
Generate a module:
```
yapper generate module user
```
This creates:
- model: src/modules/user/user.model.ts
- controller: src/modules/user/user.controller.ts
- service: src/modules/user/user.service.ts

3.Run the app:

npm run dev

Or use the provided Docker configuration if you prefer containerized development.

Example folder structure

src/
- config/
- modules/
  - user/
    - user.model.ts
    - user.controller.ts
    - user.service.ts
    - user.routes.ts
- middleware/
  - errorHandler.ts
  - requestLogger.ts
- app.ts
- server.ts
tests/
tsconfig.json
package.json
.env.example
docker-compose.yml (optional)

Why this helps

Faster iteration: scaffold and start building features, not setup.
Consistency: every project and module follows the same conventions.
Less cognitive load: no need to re-remember project wiring when switching contexts.
Better onboarding: new teammates can understand structure and patterns quickly.
Customizable: the defaults are a starting point — change templates and configs as needed.

When to use yapper

Prototyping new ideas where you need a backend fast
Starting new microservices that share common patterns
Standardizing project structure across a team
Teaching or demos where setup time shouldn’t get in the way

Tips and customization

Templates: tweak module templates to reflect your architecture (hexagonal, layered, etc.).
Logging: swap the logging implementation to your preferred library or format.
Validation: integrate your preferred validation library into generated DTOs and controllers.
CI/CD: use the generated Docker and test scaffolding to quickly add pipelines.

Wrapping up If you’re tired of repeating the same boilerplate and want to regain the time you spend on real feature work, yapper removes the busywork so you can focus on product logic. It’s an opinionated starting point that gets you to a maintainable, production-ready backend faster.

Give it a try: scaffold a project, generate a module, and get back to building what actually matters.