Standardize validation error responses across all endpoints

[djdiptayan1]

Description:
Different endpoints return validation errors in different formats, making it difficult for frontend applications to handle errors consistently.

Current Issues:

• Inconsistent error message formats
• Some endpoints return HTML errors instead of JSON
• Missing field-level validation details
• Error codes are not standardized
• No client-friendly error messages

What needs to be fixed:

• Standardize error response format
• Ensure all endpoints return JSON errors
• Add field-level validation details
• Implement consistent error codes
• Add user-friendly error messages

Acceptance Criteria:

• All validation errors follow same format
• Only JSON responses are returned
• Field-level errors are included
• Error codes are consistent
• Error messages are user-friendly

Files to modify:

• All controller files
• src/middleware/errorMiddleware.js

[Somilg11]

Hey @djdiptayan1 please assign this issue to me, i would like to contribute

[Akhand0ps]

Hey @djdiptayan1

I noticed this issue hasn't been assignend yet. I'd love to work on this issue.
Could you please assign it to me.
Also just to confirm: the goal is to have all endpoints return JSON errors with a consistent schema(with error codes, user friendly messages etc..) , replacing any HTML erros responses.
Is there an existing error format you'd like me to follow (or spec/eg)?