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Commitda650b0

Browse files
committed
feat(express): enhance global error handling by adding specific error handlers for MongoDB, Zod, and Mongoose errors; introduce error source tracking in responses
1 parent0f0cc78 commitda650b0

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3 files changed

+135
-20
lines changed

3 files changed

+135
-20
lines changed

‎apps/express/src/middlewares/GlobalErrorHandler.ts

Lines changed: 65 additions & 20 deletions
Original file line numberDiff line numberDiff line change
@@ -1,37 +1,82 @@
11
import{logger}from"@/app";
2+
importAppErrorfrom"@/configs/AppError";
23
import{env}from"@/configs/envConfig";
3-
importtype{
4-
ErrorRequestHandler,
5-
NextFunction,
6-
Request,
7-
Response,
8-
}from"express";
4+
import{TErrorSources}from"@/types/error";
5+
import{
6+
handleCastError,
7+
handlerDuplicateError,
8+
handlerValidationError,
9+
handlerZodError,
10+
}from"@/utils/errorHelpers";
11+
import{NextFunction,Request,Response}from"express";
912

10-
importAppErrorfrom"../configs/AppError";
13+
constMONGO_DUPLICATE_KEY_ERROR=11_000;
1114

12-
constGlobalErrorHandler:ErrorRequestHandler=(
13-
err,
14-
_req:Request,
15+
exportconstglobalErrorHandler=(
16+
err:unknown,
17+
req:Request,
1518
res:Response,
16-
_next:NextFunction,
19+
next:NextFunction,
1720
)=>{
18-
letstatusCode:number=err.statusCode??500;
19-
letmessage:string=err.message??`Error:${err.message}`;
20-
// log the error
21-
logger.error(err);
21+
// Log the error in development
2222

23-
if(errinstanceofAppError){
23+
logger.error(`[${req.method}]${req.originalUrl} —${req.ip}`,err);
24+
25+
leterrorSources:TErrorSources[]=[];
26+
letstatusCode=500;
27+
letmessage="Something went wrong!";
28+
29+
// Type guards
30+
constisObject=(val:unknown):val isRecord<string,any>=>
31+
typeofval==="object"&&val!==null;
32+
33+
// Duplicate key error (MongoDB)
34+
if(
35+
isObject(err)&&
36+
"code"inerr&&
37+
err.code===MONGO_DUPLICATE_KEY_ERROR
38+
){
39+
constsimplifiedError=handlerDuplicateError(err);
40+
statusCode=simplifiedError.statusCode;
41+
message=simplifiedError.message;
42+
}
43+
// Cast error (invalid ObjectId)
44+
elseif(isObject(err)&&"name"inerr&&err.name==="CastError"){
45+
constsimplifiedError=handleCastError(errasany);
46+
statusCode=simplifiedError.statusCode;
47+
message=simplifiedError.message;
48+
}
49+
// Zod schema validation error
50+
elseif(isObject(err)&&"name"inerr&&err.name==="ZodError"){
51+
constsimplifiedError=handlerZodError(errasany);
52+
statusCode=simplifiedError.statusCode;
53+
message=simplifiedError.message;
54+
errorSources=simplifiedError.errorSources;
55+
}
56+
// Mongoose validation error
57+
elseif(isObject(err)&&"name"inerr&&err.name==="ValidationError"){
58+
constsimplifiedError=handlerValidationError(errasany);
59+
statusCode=simplifiedError.statusCode;
60+
message=simplifiedError.message;
61+
errorSources=simplifiedError.errorSources;
62+
}
63+
// Custom AppError
64+
elseif(errinstanceofAppError){
2465
statusCode=err.statusCode;
2566
message=err.message;
26-
}elseif(errinstanceofError){
67+
}
68+
// General JS error
69+
elseif(errinstanceofError){
2770
message=err.message;
2871
}
2972

3073
res.status(statusCode).json({
3174
success:false,
3275
message,
33-
stack:env.NODE_ENV==="production" ?undefined :err.stack,
76+
errorSources,
77+
...(env.NODE_ENV==="development"&&{
78+
err,
79+
stack:errinstanceofError ?err.stack :undefined,
80+
}),
3481
});
3582
};
36-
37-
exportdefaultGlobalErrorHandler;

‎apps/express/src/types/error/index.ts

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,10 @@
1+
exporttypeTErrorSources={
2+
path:string|number;
3+
message:string;
4+
};
5+
6+
exporttypeTGenericErrorResponse={
7+
statusCode:number;
8+
message:string;
9+
errorSources:TErrorSources[];
10+
};
Lines changed: 60 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,60 @@
1+
import{TGenericErrorResponse}from"@/types/error";
2+
import{CastError,Error}from"mongoose";
3+
import{ZodError}from"zod";
4+
5+
exportconsthandlerZodError=(err:ZodError):TGenericErrorResponse=>{
6+
consterrorSources=err.issues.map((issue)=>({
7+
path:issue.path.join("."),
8+
message:issue.message,
9+
}));
10+
11+
return{
12+
statusCode:400,
13+
message:"Zod Validation Error",
14+
errorSources,
15+
};
16+
};
17+
18+
exportconsthandlerDuplicateError=(err:any):TGenericErrorResponse=>{
19+
constmatch=err.message.match(/(["'])(\\?.)*?\1/);
20+
constvalue=match ?match[0] :"";
21+
22+
return{
23+
statusCode:409,
24+
message:"Duplicate Key Error",
25+
errorSources:[
26+
{
27+
path:Object.keys(err.keyValue)[0]!,
28+
message:`${value} already exists.`,
29+
},
30+
],
31+
};
32+
};
33+
34+
exportconsthandlerValidationError=(
35+
err:Error.ValidationError,
36+
):TGenericErrorResponse=>{
37+
consterrorSources=Object.values(err.errors).map((val)=>({
38+
path:val.path,
39+
message:val.message,
40+
}));
41+
42+
return{
43+
statusCode:400,
44+
message:"Validation Error",
45+
errorSources,
46+
};
47+
};
48+
49+
exportconsthandleCastError=(err:CastError):TGenericErrorResponse=>{
50+
return{
51+
statusCode:400,
52+
message:"Invalid ObjectId",
53+
errorSources:[
54+
{
55+
path:err.path,
56+
message:`Invalid value for field:${err.path}`,
57+
},
58+
],
59+
};
60+
};

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