feat: Add error handling

Author: GermanMT

app/main.py

@@ -1,9 +1,15 @@
 from fastapi import FastAPI
+from fastapi.exceptions import RequestValidationError, ValidationError
+
+from json import loads
 
 from starlette.middleware.cors import CORSMiddleware
+from starlette.responses import JSONResponse
 
 from app.router import api_router
 
+from app.utils.json_encoder import JSONEncoder
+
 
 description = 'A simple backend for dependency extraction'
 
@@ -22,6 +28,16 @@
     },
 )
 
+@app.exception_handler(RequestValidationError)
+@app.exception_handler(ValidationError)
+async def validation_exception_handler(_ , exc):
+    exc_json = loads(exc.json())
+    response = {'message': []}
+    for error in exc_json:
+        response['message'].append(error['loc'][-1]+f": {error['msg']}")
+    
+    return JSONResponse(content = JSONEncoder().encode(response), status_code = 422)
+
 # Set all CORS enabled origins
 app.add_middleware(
     CORSMiddleware,