diff --git a/client/testfixture/scripts/index.ts b/client/testfixture/scripts/index.ts
index 89866a7e..05edbaf5 100644
--- a/client/testfixture/scripts/index.ts
+++ b/client/testfixture/scripts/index.ts
@@ -1,4 +1,4 @@
-import { addRoute, parsePath, query, htmlHandler, jsonHandler, stringHandler } from "../trailbase.js";
+import { addRoute, parsePath, query, htmlHandler, jsonHandler, stringHandler, HttpError } from "../trailbase.js";
 import type { JsonRequestType, ParsedPath, StringRequestType } from "../trailbase.d.ts";
 
 addRoute("GET", "/test", stringHandler(async (req: StringRequestType) => {
@@ -43,3 +43,7 @@ addRoute("GET", "/json", jsonHandler((_req: JsonRequestType) => {
     }
   };
 }));
+
+addRoute("GET", "/error", jsonHandler((_req: JsonRequestType) => {
+  throw new HttpError(418, "I'm a teapot");
+}));
diff --git a/client/testfixture/trailbase.d.ts b/client/testfixture/trailbase.d.ts
index 096ee6c5..5dcad5a3 100644
--- a/client/testfixture/trailbase.d.ts
+++ b/client/testfixture/trailbase.d.ts
@@ -77,6 +77,13 @@ export declare enum StatusCodes {
     INSUFFICIENT_STORAGE = 507,
     NETWORK_AUTHENTICATION_REQUIRED = 511
 }
+export declare class HttpError extends Error {
+    readonly statusCode: number;
+    readonly headers: [string, string][] | undefined;
+    constructor(statusCode: number, message?: string, headers?: [string, string][]);
+    toString(): string;
+    toResponse(): ResponseType;
+}
 export type StringRequestType = {
     uri: string;
     params: PathParamsType;
diff --git a/client/testfixture/trailbase.js b/client/testfixture/trailbase.js
index e5be1b79..56c6e8bb 100644
--- a/client/testfixture/trailbase.js
+++ b/client/testfixture/trailbase.js
@@ -346,6 +346,26 @@ export var StatusCodes;
     /// gain network access.
     StatusCodes[StatusCodes["NETWORK_AUTHENTICATION_REQUIRED"] = 511] = "NETWORK_AUTHENTICATION_REQUIRED";
 })(StatusCodes || (StatusCodes = {}));
+export class HttpError extends Error {
+    statusCode;
+    headers;
+    constructor(statusCode, message, headers) {
+        super(message);
+        this.statusCode = statusCode;
+        this.headers = headers;
+    }
+    toString() {
+        return `HttpError(${this.statusCode}, ${this.message})`;
+    }
+    toResponse() {
+        const m = this.message;
+        return {
+            headers: this.headers,
+            status: this.statusCode,
+            body: m !== "" ? encodeFallback(m) : undefined,
+        };
+    }
+}
 export function stringHandler(f) {
     return async (req) => {
         try {
@@ -373,6 +393,9 @@ export function stringHandler(f) {
             };
         }
         catch (err) {
+            if (err instanceof HttpError) {
+                return err.toResponse();
+            }
             return {
                 status: StatusCodes.INTERNAL_SERVER_ERROR,
                 body: encodeFallback(`Uncaught error: ${err}`),
@@ -408,6 +431,9 @@ export function htmlHandler(f) {
             };
         }
         catch (err) {
+            if (err instanceof HttpError) {
+                return err.toResponse();
+            }
             return {
                 status: StatusCodes.INTERNAL_SERVER_ERROR,
                 body: encodeFallback(`Uncaught error: ${err}`),
@@ -444,6 +470,9 @@ export function jsonHandler(f) {
             };
         }
         catch (err) {
+            if (err instanceof HttpError) {
+                return err.toResponse();
+            }
             return {
                 headers: [["content-type", "application/json"]],
                 status: StatusCodes.INTERNAL_SERVER_ERROR,
diff --git a/trailbase-core/js/src/index.ts b/trailbase-core/js/src/index.ts
index 89de1e1f..bbddd370 100644
--- a/trailbase-core/js/src/index.ts
+++ b/trailbase-core/js/src/index.ts
@@ -365,6 +365,34 @@ export enum StatusCodes {
   NETWORK_AUTHENTICATION_REQUIRED = 511,
 }
 
+export class HttpError extends Error {
+  readonly statusCode: number;
+  readonly headers: [string, string][] | undefined;
+
+  constructor(
+    statusCode: number,
+    message?: string,
+    headers?: [string, string][],
+  ) {
+    super(message);
+    this.statusCode = statusCode;
+    this.headers = headers;
+  }
+
+  public override toString(): string {
+    return `HttpError(${this.statusCode}, ${this.message})`;
+  }
+
+  toResponse(): ResponseType {
+    const m = this.message;
+    return {
+      headers: this.headers,
+      status: this.statusCode,
+      body: m !== "" ? encodeFallback(m) : undefined,
+    };
+  }
+}
+
 export type StringRequestType = {
   uri: string;
   params: PathParamsType;
@@ -408,6 +436,9 @@ export function stringHandler(
         body: respBody ? encodeFallback(respBody) : undefined,
       };
     } catch (err) {
+      if (err instanceof HttpError) {
+        return err.toResponse();
+      }
       return {
         status: StatusCodes.INTERNAL_SERVER_ERROR,
         body: encodeFallback(`Uncaught error: ${err}`),
@@ -454,6 +485,9 @@ export function htmlHandler(
         body: respBody ? encodeFallback(respBody) : undefined,
       };
     } catch (err) {
+      if (err instanceof HttpError) {
+        return err.toResponse();
+      }
       return {
         status: StatusCodes.INTERNAL_SERVER_ERROR,
         body: encodeFallback(`Uncaught error: ${err}`),
@@ -507,6 +541,9 @@ export function jsonHandler(
         body: encodeFallback(JSON.stringify(resp)),
       };
     } catch (err) {
+      if (err instanceof HttpError) {
+        return err.toResponse();
+      }
       return {
         headers: [["content-type", "application/json"]],
         status: StatusCodes.INTERNAL_SERVER_ERROR,