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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | 4x 12x 12x 12x 12x 12x 3x 1x 1x 2x 1x 1x 1x 4x 5x 5x 2x 3x 3x 3x 2x 1x 1x | import { ErrorHandler } from "hono";
import { ContentfulStatusCode } from "hono/utils/http-status";
/**
* Standardized API error class.
* Throw this from any route handler — the errorHandler middleware
* will format it into `{ error: { message, code, details? } }`.
*/
export class ApiError extends Error {
public readonly statusCode: number;
public readonly code: string;
public readonly details?: unknown;
constructor(statusCode: number, code: string, message: string, details?: unknown) {
super(message);
this.name = "ApiError";
this.statusCode = statusCode;
this.code = code;
this.details = details;
}
// ── Factory methods ──────────────────────────────────────────────
static badRequest(message: string, code = "BAD_REQUEST", details?: unknown): ApiError {
return new ApiError(400, code, message, details);
}
static unauthorized(message: string, code = "UNAUTHORIZED"): ApiError {
return new ApiError(401, code, message);
}
static forbidden(message: string, code = "FORBIDDEN"): ApiError {
return new ApiError(403, code, message);
}
static notFound(message: string, code = "NOT_FOUND"): ApiError {
return new ApiError(404, code, message);
}
static conflict(message: string, code = "CONFLICT"): ApiError {
return new ApiError(409, code, message);
}
static internal(message: string, code = "INTERNAL_ERROR"): ApiError {
return new ApiError(500, code, message);
}
static serviceUnavailable(message: string, code = "SERVICE_UNAVAILABLE"): ApiError {
return new ApiError(503, code, message);
}
}
/**
* Canonical error response shape:
* `{ error: { message: string, code: string, details?: unknown } }`
*/
export interface ErrorResponse {
error: {
message: string;
code: string;
details?: unknown;
};
}
/**
* Hono error-handling middleware (`app.onError`).
* Converts any error into the canonical `{ error: { message, code } }` shape.
*/
export const errorHandler: ErrorHandler = (err, c) => {
// Typecast custom error properties
const error = err as Error & { statusCode?: number; code?: string; details?: unknown };
if (error instanceof ApiError) {
// Operational errors — log at warn level
console.warn(
`⚠️ [API] ${c.req.method} ${c.req.path} → ${error.statusCode} ${error.code}: ${error.message}`
);
return c.json({
error: {
message: error.message,
code: error.code,
...(error.details !== undefined && { details: error.details })
}
} satisfies ErrorResponse, (error.statusCode || 500) as ContentfulStatusCode);
}
const statusCode = error.statusCode || codeToStatus(error.code) || 500;
const code = error.code || "INTERNAL_ERROR";
// Unexpected errors — log at error level with full stack
console.error(
`❌ [API] ${c.req.method} ${c.req.path} → ${statusCode} ${code}: ${error.message}`
);
console.error(error.stack || error);
return c.json({
error: {
message: error.message || "An unexpected error occurred",
code,
...(error.details !== undefined && { details: error.details })
}
} satisfies ErrorResponse, statusCode as ContentfulStatusCode);
};
/**
* Map known error codes to HTTP status codes.
*/
function codeToStatus(code?: string): number | undefined {
if (!code) return undefined;
const map: Record<string, number> = {
BAD_REQUEST: 400,
INVALID_INPUT: 400,
WEAK_PASSWORD: 400,
UNAUTHORIZED: 401,
INVALID_CREDENTIALS: 401,
INVALID_TOKEN: 401,
FORBIDDEN: 403,
NOT_FOUND: 404,
CONFLICT: 409,
EMAIL_EXISTS: 409,
ROLE_EXISTS: 409,
INTERNAL_ERROR: 500,
NOT_CONFIGURED: 503,
SERVICE_UNAVAILABLE: 503,
};
return map[code];
}
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