diff --git a/_examples/node-ts/server/server.gen.ts b/_examples/node-ts/server/server.gen.ts
index 862a5ac..00d5e2f 100644
--- a/_examples/node-ts/server/server.gen.ts
+++ b/_examples/node-ts/server/server.gen.ts
@@ -1,13 +1,13 @@
 /* eslint-disable */
-// node-ts v1.0.0 6713366104e62b8479d628a193e2a7ca03f37edc
+// node-ts v1.0.0 f5566a7aae2c4d2f76cc64d8e55f9ac841447e43
 // --
-// Code generated by webrpc-gen@v0.21.4 with ../../../gen-typescript generator. DO NOT EDIT.
+// Code generated by webrpc-gen@v0.22.0 with ../../../gen-typescript generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=service.ridl -target=../../../gen-typescript -server -out=./server/server.gen.ts
 
 export const WebrpcHeader = "Webrpc"
 
-export const WebrpcHeaderValue = "webrpc@v0.21.4;gen-typescript@unknown;node-ts@v1.0.0"
+export const WebrpcHeaderValue = "webrpc@v0.22.0;gen-typescript@unknown;node-ts@v1.0.0"
 
 // WebRPC description and code-gen version
 export const WebRPCVersion = "v1"
@@ -16,7 +16,7 @@ export const WebRPCVersion = "v1"
 export const WebRPCSchemaVersion = "v1.0.0"
 
 // Schema hash generated from your RIDL schema
-export const WebRPCSchemaHash = "6713366104e62b8479d628a193e2a7ca03f37edc"
+export const WebRPCSchemaHash = "f5566a7aae2c4d2f76cc64d8e55f9ac841447e43"
 
 type WebrpcGenVersions = {
   webrpcGenVersion: string;
diff --git a/_examples/node-ts/service.ridl b/_examples/node-ts/service.ridl
index a121481..386fd85 100644
--- a/_examples/node-ts/service.ridl
+++ b/_examples/node-ts/service.ridl
@@ -3,12 +3,10 @@ webrpc = v1
 name = node-ts
 version = v1.0.0
 
-
 enum Kind: uint32
   - USER
   - ADMIN
 
-
 struct User
   - ID: uint64
     + json = id
@@ -25,11 +23,17 @@ struct User
 
   - createdAt?: timestamp
 
-
 struct Page
   - num: uint32
 
-
 service ExampleService
   - Ping() => ()
   - GetUser(userID: uint64) => (code: uint32, user: User)
+
+error 1000 Unauthorized     "Unauthorized access"                                HTTP 401
+error 1001 PermissionDenied "Permission denied"                                  HTTP 403
+error 1002 SessionExpired   "Session expired"                                    HTTP 403
+error 1003 Geoblocked       "Geoblocked region"                                  HTTP 451
+error 1004 RateLimited      "Rate-limited. Please slow down."                    HTTP 429
+error 1005 CorsDisallowed   "CORS disallowed. JWT can't be used from a web app." HTTP 403
+
diff --git a/_examples/node-ts/webapp/client.gen.ts b/_examples/node-ts/webapp/client.gen.ts
index 8cb49d2..496c943 100644
--- a/_examples/node-ts/webapp/client.gen.ts
+++ b/_examples/node-ts/webapp/client.gen.ts
@@ -1,13 +1,13 @@
 /* eslint-disable */
-// node-ts v1.0.0 6713366104e62b8479d628a193e2a7ca03f37edc
+// node-ts v1.0.0 f5566a7aae2c4d2f76cc64d8e55f9ac841447e43
 // --
-// Code generated by webrpc-gen@v0.21.4 with ../../../gen-typescript generator. DO NOT EDIT.
+// Code generated by webrpc-gen@v0.22.0 with ../../../gen-typescript generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=service.ridl -target=../../../gen-typescript -client -out=./webapp/client.gen.ts
 
 export const WebrpcHeader = "Webrpc"
 
-export const WebrpcHeaderValue = "webrpc@v0.21.4;gen-typescript@unknown;node-ts@v1.0.0"
+export const WebrpcHeaderValue = "webrpc@v0.22.0;gen-typescript@unknown;node-ts@v1.0.0"
 
 // WebRPC description and code-gen version
 export const WebRPCVersion = "v1"
@@ -16,7 +16,7 @@ export const WebRPCVersion = "v1"
 export const WebRPCSchemaVersion = "v1.0.0"
 
 // Schema hash generated from your RIDL schema
-export const WebRPCSchemaHash = "6713366104e62b8479d628a193e2a7ca03f37edc"
+export const WebRPCSchemaHash = "f5566a7aae2c4d2f76cc64d8e55f9ac841447e43"
 
 type WebrpcGenVersions = {
   webrpcGenVersion: string;
@@ -227,7 +227,7 @@ export class WebrpcEndpointError extends WebrpcError {
   constructor(
     name: string = 'WebrpcEndpoint',
     code: number = 0,
-    message: string = 'endpoint error',
+    message: string = `endpoint error`,
     status: number = 0,
     cause?: string
   ) {
@@ -240,7 +240,7 @@ export class WebrpcRequestFailedError extends WebrpcError {
   constructor(
     name: string = 'WebrpcRequestFailed',
     code: number = -1,
-    message: string = 'request failed',
+    message: string = `request failed`,
     status: number = 0,
     cause?: string
   ) {
@@ -253,7 +253,7 @@ export class WebrpcBadRouteError extends WebrpcError {
   constructor(
     name: string = 'WebrpcBadRoute',
     code: number = -2,
-    message: string = 'bad route',
+    message: string = `bad route`,
     status: number = 0,
     cause?: string
   ) {
@@ -266,7 +266,7 @@ export class WebrpcBadMethodError extends WebrpcError {
   constructor(
     name: string = 'WebrpcBadMethod',
     code: number = -3,
-    message: string = 'bad method',
+    message: string = `bad method`,
     status: number = 0,
     cause?: string
   ) {
@@ -279,7 +279,7 @@ export class WebrpcBadRequestError extends WebrpcError {
   constructor(
     name: string = 'WebrpcBadRequest',
     code: number = -4,
-    message: string = 'bad request',
+    message: string = `bad request`,
     status: number = 0,
     cause?: string
   ) {
@@ -292,7 +292,7 @@ export class WebrpcBadResponseError extends WebrpcError {
   constructor(
     name: string = 'WebrpcBadResponse',
     code: number = -5,
-    message: string = 'bad response',
+    message: string = `bad response`,
     status: number = 0,
     cause?: string
   ) {
@@ -305,7 +305,7 @@ export class WebrpcServerPanicError extends WebrpcError {
   constructor(
     name: string = 'WebrpcServerPanic',
     code: number = -6,
-    message: string = 'server panic',
+    message: string = `server panic`,
     status: number = 0,
     cause?: string
   ) {
@@ -318,7 +318,7 @@ export class WebrpcInternalErrorError extends WebrpcError {
   constructor(
     name: string = 'WebrpcInternalError',
     code: number = -7,
-    message: string = 'internal error',
+    message: string = `internal error`,
     status: number = 0,
     cause?: string
   ) {
@@ -331,7 +331,7 @@ export class WebrpcClientDisconnectedError extends WebrpcError {
   constructor(
     name: string = 'WebrpcClientDisconnected',
     code: number = -8,
-    message: string = 'client disconnected',
+    message: string = `client disconnected`,
     status: number = 0,
     cause?: string
   ) {
@@ -344,7 +344,7 @@ export class WebrpcStreamLostError extends WebrpcError {
   constructor(
     name: string = 'WebrpcStreamLost',
     code: number = -9,
-    message: string = 'stream lost',
+    message: string = `stream lost`,
     status: number = 0,
     cause?: string
   ) {
@@ -357,7 +357,7 @@ export class WebrpcStreamFinishedError extends WebrpcError {
   constructor(
     name: string = 'WebrpcStreamFinished',
     code: number = -10,
-    message: string = 'stream finished',
+    message: string = `stream finished`,
     status: number = 0,
     cause?: string
   ) {
@@ -369,6 +369,84 @@ export class WebrpcStreamFinishedError extends WebrpcError {
 
 // Schema errors
 
+export class UnauthorizedError extends WebrpcError {
+  constructor(
+    name: string = 'Unauthorized',
+    code: number = 1000,
+    message: string = `Unauthorized access`,
+    status: number = 0,
+    cause?: string
+  ) {
+    super(name, code, message, status, cause)
+    Object.setPrototypeOf(this, UnauthorizedError.prototype)
+  }
+}
+
+export class PermissionDeniedError extends WebrpcError {
+  constructor(
+    name: string = 'PermissionDenied',
+    code: number = 1001,
+    message: string = `Permission denied`,
+    status: number = 0,
+    cause?: string
+  ) {
+    super(name, code, message, status, cause)
+    Object.setPrototypeOf(this, PermissionDeniedError.prototype)
+  }
+}
+
+export class SessionExpiredError extends WebrpcError {
+  constructor(
+    name: string = 'SessionExpired',
+    code: number = 1002,
+    message: string = `Session expired`,
+    status: number = 0,
+    cause?: string
+  ) {
+    super(name, code, message, status, cause)
+    Object.setPrototypeOf(this, SessionExpiredError.prototype)
+  }
+}
+
+export class GeoblockedError extends WebrpcError {
+  constructor(
+    name: string = 'Geoblocked',
+    code: number = 1003,
+    message: string = `Geoblocked region`,
+    status: number = 0,
+    cause?: string
+  ) {
+    super(name, code, message, status, cause)
+    Object.setPrototypeOf(this, GeoblockedError.prototype)
+  }
+}
+
+export class RateLimitedError extends WebrpcError {
+  constructor(
+    name: string = 'RateLimited',
+    code: number = 1004,
+    message: string = `Rate-limited. Please slow down.`,
+    status: number = 0,
+    cause?: string
+  ) {
+    super(name, code, message, status, cause)
+    Object.setPrototypeOf(this, RateLimitedError.prototype)
+  }
+}
+
+export class CorsDisallowedError extends WebrpcError {
+  constructor(
+    name: string = 'CorsDisallowed',
+    code: number = 1005,
+    message: string = `CORS disallowed. JWT can't be used from a web app.`,
+    status: number = 0,
+    cause?: string
+  ) {
+    super(name, code, message, status, cause)
+    Object.setPrototypeOf(this, CorsDisallowedError.prototype)
+  }
+}
+
 
 export enum errors {
   WebrpcEndpoint = 'WebrpcEndpoint',
@@ -382,6 +460,12 @@ export enum errors {
   WebrpcClientDisconnected = 'WebrpcClientDisconnected',
   WebrpcStreamLost = 'WebrpcStreamLost',
   WebrpcStreamFinished = 'WebrpcStreamFinished',
+  Unauthorized = 'Unauthorized',
+  PermissionDenied = 'PermissionDenied',
+  SessionExpired = 'SessionExpired',
+  Geoblocked = 'Geoblocked',
+  RateLimited = 'RateLimited',
+  CorsDisallowed = 'CorsDisallowed',
 }
 
 export enum WebrpcErrorCodes {
@@ -396,6 +480,12 @@ export enum WebrpcErrorCodes {
   WebrpcClientDisconnected = -8,
   WebrpcStreamLost = -9,
   WebrpcStreamFinished = -10,
+  Unauthorized = 1000,
+  PermissionDenied = 1001,
+  SessionExpired = 1002,
+  Geoblocked = 1003,
+  RateLimited = 1004,
+  CorsDisallowed = 1005,
 }
 
 export const webrpcErrorByCode: { [code: number]: any } = {
@@ -410,6 +500,12 @@ export const webrpcErrorByCode: { [code: number]: any } = {
   [-8]: WebrpcClientDisconnectedError,
   [-9]: WebrpcStreamLostError,
   [-10]: WebrpcStreamFinishedError,
+  [1000]: UnauthorizedError,
+  [1001]: PermissionDeniedError,
+  [1002]: SessionExpiredError,
+  [1003]: GeoblockedError,
+  [1004]: RateLimitedError,
+  [1005]: CorsDisallowedError,
 }
 
 export type Fetch = (input: RequestInfo, init?: RequestInit) => Promise<Response>
diff --git a/_examples/sse/webapp/client.gen.ts b/_examples/sse/webapp/client.gen.ts
index 0318db2..32d3550 100644
--- a/_examples/sse/webapp/client.gen.ts
+++ b/_examples/sse/webapp/client.gen.ts
@@ -1,13 +1,13 @@
 /* eslint-disable */
 // webrpc-sse-chat v1.0.0 a799dc63b082644f5d003c8881424546aee23a2c
 // --
-// Code generated by webrpc-gen@v0.21.4 with ../../ generator. DO NOT EDIT.
+// Code generated by webrpc-gen@v0.22.0 with ../../ generator. DO NOT EDIT.
 //
 // webrpc-gen -schema=service.ridl -target=../../ -client -out=./webapp/client.gen.ts
 
 export const WebrpcHeader = "Webrpc"
 
-export const WebrpcHeaderValue = "webrpc@v0.21.4;@unknown;webrpc-sse-chat@v1.0.0"
+export const WebrpcHeaderValue = "webrpc@v0.22.0;@unknown;webrpc-sse-chat@v1.0.0"
 
 // WebRPC description and code-gen version
 export const WebRPCVersion = "v1"
@@ -383,7 +383,7 @@ export class WebrpcEndpointError extends WebrpcError {
   constructor(
     name: string = 'WebrpcEndpoint',
     code: number = 0,
-    message: string = 'endpoint error',
+    message: string = `endpoint error`,
     status: number = 0,
     cause?: string
   ) {
@@ -396,7 +396,7 @@ export class WebrpcRequestFailedError extends WebrpcError {
   constructor(
     name: string = 'WebrpcRequestFailed',
     code: number = -1,
-    message: string = 'request failed',
+    message: string = `request failed`,
     status: number = 0,
     cause?: string
   ) {
@@ -409,7 +409,7 @@ export class WebrpcBadRouteError extends WebrpcError {
   constructor(
     name: string = 'WebrpcBadRoute',
     code: number = -2,
-    message: string = 'bad route',
+    message: string = `bad route`,
     status: number = 0,
     cause?: string
   ) {
@@ -422,7 +422,7 @@ export class WebrpcBadMethodError extends WebrpcError {
   constructor(
     name: string = 'WebrpcBadMethod',
     code: number = -3,
-    message: string = 'bad method',
+    message: string = `bad method`,
     status: number = 0,
     cause?: string
   ) {
@@ -435,7 +435,7 @@ export class WebrpcBadRequestError extends WebrpcError {
   constructor(
     name: string = 'WebrpcBadRequest',
     code: number = -4,
-    message: string = 'bad request',
+    message: string = `bad request`,
     status: number = 0,
     cause?: string
   ) {
@@ -448,7 +448,7 @@ export class WebrpcBadResponseError extends WebrpcError {
   constructor(
     name: string = 'WebrpcBadResponse',
     code: number = -5,
-    message: string = 'bad response',
+    message: string = `bad response`,
     status: number = 0,
     cause?: string
   ) {
@@ -461,7 +461,7 @@ export class WebrpcServerPanicError extends WebrpcError {
   constructor(
     name: string = 'WebrpcServerPanic',
     code: number = -6,
-    message: string = 'server panic',
+    message: string = `server panic`,
     status: number = 0,
     cause?: string
   ) {
@@ -474,7 +474,7 @@ export class WebrpcInternalErrorError extends WebrpcError {
   constructor(
     name: string = 'WebrpcInternalError',
     code: number = -7,
-    message: string = 'internal error',
+    message: string = `internal error`,
     status: number = 0,
     cause?: string
   ) {
@@ -487,7 +487,7 @@ export class WebrpcClientDisconnectedError extends WebrpcError {
   constructor(
     name: string = 'WebrpcClientDisconnected',
     code: number = -8,
-    message: string = 'client disconnected',
+    message: string = `client disconnected`,
     status: number = 0,
     cause?: string
   ) {
@@ -500,7 +500,7 @@ export class WebrpcStreamLostError extends WebrpcError {
   constructor(
     name: string = 'WebrpcStreamLost',
     code: number = -9,
-    message: string = 'stream lost',
+    message: string = `stream lost`,
     status: number = 0,
     cause?: string
   ) {
@@ -513,7 +513,7 @@ export class WebrpcStreamFinishedError extends WebrpcError {
   constructor(
     name: string = 'WebrpcStreamFinished',
     code: number = -10,
-    message: string = 'stream finished',
+    message: string = `stream finished`,
     status: number = 0,
     cause?: string
   ) {
@@ -529,7 +529,7 @@ export class EmptyUsernameError extends WebrpcError {
   constructor(
     name: string = 'EmptyUsername',
     code: number = 100,
-    message: string = 'Username must be provided.',
+    message: string = `Username must be provided.`,
     status: number = 0,
     cause?: string
   ) {
diff --git a/clientHelpers.go.tmpl b/clientHelpers.go.tmpl
index d5c0320..a951b95 100644
--- a/clientHelpers.go.tmpl
+++ b/clientHelpers.go.tmpl
@@ -75,7 +75,7 @@ export class {{$error.Name}}Error extends WebrpcError {
   constructor(
     name: string = '{{$error.Name}}',
     code: number = {{$error.Code}},
-    message: string = '{{$error.Message}}',
+    message: string = `{{$error.Message}}`,
     status: number = 0,
     cause?: string
   ) {
@@ -91,7 +91,7 @@ export class {{$error.Name}}Error extends WebrpcError {
   constructor(
     name: string = '{{$error.Name}}',
     code: number = {{$error.Code}},
-    message: string = '{{$error.Message}}',
+    message: string = `{{$error.Message}}`,
     status: number = 0,
     cause?: string
   ) {