fix: standardize API validation error format with error codes (#967) - #1011
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nanaf6203-bit merged 1 commit intoJul 29, 2026
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…hain#967) - Add ValidationExceptionFilter that catches BadRequestException - Output standardized JSON: { success, statusCode, errors: [{ field, message, code, constraints }] } - Field names follow camelCase convention (class-validator defaults) - Auto-infer error codes (IS_EMAIL, MIN_LENGTH, IS_NOT_EMPTY, etc.) - i18n-aware with language resolution from Accept-Language / user preference - Register globally via APP_FILTER in AppModule Closes MettaChain#967
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Summary
Adds a
ValidationExceptionFilterthat catchesBadRequestExceptionerrors fromValidationPipeand outputs a standardized JSON format with error codes.Changes
New file:
src/common/filters/validation-exception.filter.tsBadRequestExceptionwith array messages (validation errors){ success, statusCode, errors: [{ field, message, code, constraints }] }IS_EMAIL,MIN_LENGTH,IS_NOT_EMPTY, etc.)I18nServicefor language resolutionBadRequestExceptionModified:
src/app.module.tsValidationExceptionFilteras a globalAPP_FILTERAcceptance Criteria
{ field, message, code, constraints }Closes #967