diff --git a/src/RelayResponse.js b/src/RelayResponse.js
index 0ca977d..63ee5b3 100644
--- a/src/RelayResponse.js
+++ b/src/RelayResponse.js
@@ -1,12 +1,12 @@
 /* @flow */
 
-import type { PayloadData, FetchResponse } from './definition';
+import type { FetchResponse, GraphQLResponseErrors, PayloadData } from './definition';
 
 export default class RelayResponse {
   _res: any; // response from low-level method, eg. fetch
 
   data: ?PayloadData;
-  errors: ?Array<any>;
+  errors: ?GraphQLResponseErrors;
 
   ok: any;
   status: number;
diff --git a/src/index.d.ts b/src/index.d.ts
index 9edbfe7..3ea4210 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -7,7 +7,7 @@ declare class RelayResponse {
   _res: any;
 
   data?: PayloadData;
-  errors?: any[];
+  errors?: GraphQLResponseErrors;
 
   ok: any;
   status: number;
@@ -146,7 +146,7 @@ export type BatchMiddlewareOpts = {
   allowMutations?: boolean;
   method?: 'POST' | 'GET';
   headers?: Headers | Promise<Headers> | ((req: RelayRequestBatch) => Headers | Promise<Headers>);
-  // Avaliable request modes in fetch options. For details see https://fetch.spec.whatwg.org/#requests
+  // Available request modes in fetch options. For details see https://fetch.spec.whatwg.org/#requests
   credentials?: FetchOpts['credentials'];
   mode?: FetchOpts['mode'];
   cache?: FetchOpts['cache'];
@@ -296,3 +296,12 @@ export class RelayNetworkLayer {
 
   execute: ExecuteFunction;
 }
+
+export type GraphQLResponseErrors = Array<{
+  message: string;
+  locations?: [{ column: number; line: number }];
+  stack?: string[];
+}>;
+
+export function createRequestError(request: RelayRequestAny, response?: RelayResponse);
+export function formatGraphQLErrors(request: RelayRequest, errors: GraphQLResponseErrors);
diff --git a/src/index.js b/src/index.js
index 69553ee..c9dc9dd 100644
--- a/src/index.js
+++ b/src/index.js
@@ -16,7 +16,7 @@ import graphqlBatchHTTPWrapper from './express-middleware/graphqlBatchHTTPWrappe
 import RelayNetworkLayerRequest from './RelayRequest';
 import RelayNetworkLayerRequestBatch from './RelayRequestBatch';
 import RelayNetworkLayerResponse from './RelayResponse';
-import { RRNLRequestError } from './createRequestError';
+import { createRequestError, formatGraphQLErrors, RRNLRequestError } from './createRequestError';
 import RRNLError from './RRNLError';
 
 export {
@@ -36,6 +36,8 @@ export {
   progressMiddleware,
   uploadMiddleware,
   graphqlBatchHTTPWrapper,
+  createRequestError,
+  formatGraphQLErrors,
   RRNLError,
   RRNLRequestError,
   RRNLRetryMiddlewareError,