ArchAPI

ArchAPI is a Python library for architecture-preserving REST API generation.

It scans an existing backend project, detects the framework, understands the project structure, plans a REST API, generates framework-specific files, validates the output, and writes files only when explicitly requested.

Current Status

Current checkpoint: 0.3.1

ArchAPI currently supports:

• Express TypeScript
• FastAPI
• Generic fallback detection for unsupported projects

Core features:

• Framework detection
• Project scanning
• API architecture modeling
• Confidence scoring
• Low-confidence blocking
• Strict config mode
• REST intent planning
• Dry-run code generation
• Safe apply behavior
• Overwrite protection
• Cache and changed-file detection
• Secret scanning helpers
• Context redaction
• Policy gate
• Architecture consistency scoring
• Unified regression test suite

Installation from PyPI

python -m pip install archapi

Verify:

python -c "from archapi import ArchAPI; print('ArchAPI import works')"

Run from GitHub Source

git clone https://github.com/rohith5005/archapi.git
cd archapi

python3 -m venv .venv
source .venv/bin/activate

python -m pip install --upgrade pip setuptools wheel
python -m pip install -e .

Verify:

python -c "from archapi import ArchAPI; print('GitHub source install worked')"

Run Tests

python -m compileall archapi
python -m unittest tests.test_archapi_suite -v

Or:

./scripts/run_tests.sh

Expected result:

Ran 7 tests

OK

Basic Usage

from archapi import ArchAPI

engine = ArchAPI("./sample_projects/express_basic")

result = engine.generate_api(
    "Create GET API for user order history",
    dry_run=True,
)

print(result.plan)
print(result.validation_report)
print(result.diff)

Express TypeScript Example

from pathlib import Path
from archapi import ArchAPI

project = Path("express_basic")

(project / "src/routes").mkdir(parents=True, exist_ok=True)
(project / "src/controllers").mkdir(parents=True, exist_ok=True)
(project / "src/services").mkdir(parents=True, exist_ok=True)
(project / "src/schemas").mkdir(parents=True, exist_ok=True)
(project / "tests").mkdir(parents=True, exist_ok=True)

(project / "package.json").write_text(
    '{"dependencies": {"express": "^4.18.0", "zod": "^3.0.0"}}'
)

(project / "src/routes/user.routes.ts").write_text(
    'import { Router } from "express";\n'
    'const router = Router();\n'
    'export default router;\n'
)

(project / "src/controllers/user.controller.ts").write_text(
    'export const userController = {};\n'
)

(project / "src/services/user.service.ts").write_text(
    'export const userService = {};\n'
)

(project / "src/schemas/user.schema.ts").write_text(
    'import { z } from "zod";\n'
)

(project / "tests/user.test.ts").write_text(
    'describe("user", () => { it("works", () => expect(true).toBe(true)); });\n'
)

engine = ArchAPI(str(project))
result = engine.generate_api("Create GET API for user order history", dry_run=True)

print("Detected framework:", engine.detect_framework().framework)
print("Generated method:", result.plan.method)
print("Generated path:", result.plan.path)
print("Generated files:", [str(file.path) for file in result.files])

Expected output includes:

Detected framework: express-typescript
Generated method: GET
Generated path: /users/{user_id}/orders

FastAPI Example

from pathlib import Path
from archapi import ArchAPI

project = Path("fastapi_basic")

(project / "app/routers").mkdir(parents=True, exist_ok=True)
(project / "app/services").mkdir(parents=True, exist_ok=True)
(project / "app/schemas").mkdir(parents=True, exist_ok=True)
(project / "tests").mkdir(parents=True, exist_ok=True)

(project / "requirements.txt").write_text("fastapi\npydantic\npytest\n")

(project / "app/routers/user_router.py").write_text(
    "from fastapi import APIRouter\n"
    "router = APIRouter()\n"
)

(project / "app/services/user_service.py").write_text(
    "class UserService:\n"
    "    pass\n\n"
    "user_service = UserService()\n"
)

(project / "app/schemas/user_schema.py").write_text(
    "from pydantic import BaseModel\n\n"
    "class UserResponse(BaseModel):\n"
    "    id: str\n"
)

(project / "tests/test_user.py").write_text(
    "def test_user_placeholder():\n"
    "    assert True\n"
)

engine = ArchAPI(str(project))
result = engine.generate_api("Create POST API for product review", dry_run=True)

print("Detected framework:", engine.detect_framework().framework)
print("Generated method:", result.plan.method)
print("Generated path:", result.plan.path)
print("Generated files:", [str(file.path) for file in result.files])

Expected output includes:

Detected framework: fastapi
Generated method: POST
Generated path: /products/{product_id}/reviews

Documentation

• How to Run
• Architecture
• File Guide
• Security Measures
• Development Status

Links

• GitHub: https://github.com/rohith5005/archapi
• PyPI: https://pypi.org/project/archapi/