diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec5cf8f0b12..89d31dcc3cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ All of the packages in the `apollo-server` repo are released with the same versi
 ### vNEXT
 
 - Provide ability to specify client info in traces [#1631](https://github.com/apollographql/apollo-server/pull/1631)
+- Core: Allow context to be passed to all GraphQLExtension methods. [PR #1547](https://github.com/apollographql/apollo-server/pull/1547)
 
 ### v2.0.7
 
diff --git a/package-lock.json b/package-lock.json
index ff694f8d216..f56bc72758d 100644
--- a/package-lock.json
+++ b/package-lock.json
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+          }
+        },
+        "read-pkg-up": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/read-pkg-up/-/read-pkg-up-1.0.1.tgz",
+          "integrity": "sha1-nWPBMnbAZZGNV/ACpX9AobZD+wI=",
+          "dev": true,
+          "requires": {
+            "find-up": "1.1.2",
+            "read-pkg": "1.1.0"
+          }
+        },
+        "strip-bom": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
+          "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
+          "dev": true,
+          "requires": {
+            "is-utf8": "0.2.1"
+          }
+        }
       }
     },
     "test-listen": {
@@ -11886,9 +12090,9 @@
       "dev": true
     },
     "to-fast-properties": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
-      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
+      "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
       "dev": true
     },
     "to-object-path": {
@@ -12605,7 +12809,7 @@
     },
     "yargs": {
       "version": "11.1.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
       "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
       "dev": true,
       "requires": {
diff --git a/package.json b/package.json
index 8d3b0541d6d..2a82a98e96a 100644
--- a/package.json
+++ b/package.json
@@ -65,7 +65,7 @@
     "@types/fibers": "0.0.30",
     "@types/graphql": "14.0.0",
     "@types/hapi": "17.0.19",
-    "@types/jest": "23.3.1",
+    "@types/jest": "23.3.2",
     "@types/koa-multer": "1.0.0",
     "@types/koa-router": "7.0.31",
     "@types/lodash": "4.14.116",
@@ -91,8 +91,8 @@
     "graphql-tools": "3.1.1",
     "hapi": "17.5.4",
     "husky": "0.14.3",
-    "jest": "23.5.0",
-    "jest-matcher-utils": "23.5.0",
+    "jest": "23.6.0",
+    "jest-matcher-utils": "23.6.0",
     "js-sha256": "0.9.0",
     "koa-multer": "1.0.2",
     "lerna": "3.3.0",
diff --git a/packages/apollo-engine-reporting/src/extension.ts b/packages/apollo-engine-reporting/src/extension.ts
index de5c6ecf5e9..02506978138 100644
--- a/packages/apollo-engine-reporting/src/extension.ts
+++ b/packages/apollo-engine-reporting/src/extension.ts
@@ -57,7 +57,7 @@ export class EngineReportingExtension<TContext = any>
     request: Request;
     queryString?: string;
     parsedQuery?: DocumentNode;
-    variables: Record<string, any>;
+    variables?: Record<string, any>;
     persistedQueryHit?: boolean;
     persistedQueryRegister?: boolean;
   }): EndHandler {
@@ -139,7 +139,7 @@ export class EngineReportingExtension<TContext = any>
           this.trace.details!.variablesJson![name] = '';
         } else {
           this.trace.details!.variablesJson![name] = JSON.stringify(
-            o.variables[name],
+            o.variables![name],
           );
         }
       });
diff --git a/packages/apollo-server-core/src/__tests__/runQuery.test.ts b/packages/apollo-server-core/src/__tests__/runQuery.test.ts
index cc3ea0e98ab..f2b6729eda4 100644
--- a/packages/apollo-server-core/src/__tests__/runQuery.test.ts
+++ b/packages/apollo-server-core/src/__tests__/runQuery.test.ts
@@ -353,6 +353,28 @@ describe('runQuery', () => {
         });
       });
     });
+
+    it('runs willSendResponse with extensions context', async () => {
+      class CustomExtension implements GraphQLExtension<any> {
+        willSendResponse(o: any) {
+          expect(o).toHaveProperty('context.baz', 'always here');
+          return o;
+        }
+      }
+
+      const queryString = `{ testString }`;
+      const expected = { testString: 'it works' };
+      const extensions = [() => new CustomExtension()];
+      return runQuery({
+        schema,
+        queryString,
+        context: { baz: 'always here' },
+        extensions,
+        request: new MockReq(),
+      }).then(res => {
+        expect(res.data).toEqual(expected);
+      });
+    });
   });
 
   describe('async_hooks', () => {
diff --git a/packages/apollo-server-core/src/formatters.ts b/packages/apollo-server-core/src/formatters.ts
index 8e708b41393..8cedf112d20 100644
--- a/packages/apollo-server-core/src/formatters.ts
+++ b/packages/apollo-server-core/src/formatters.ts
@@ -1,7 +1,7 @@
 import { GraphQLExtension, GraphQLResponse } from 'graphql-extensions';
 import { formatApolloErrors } from 'apollo-server-errors';
 
-export class FormatErrorExtension extends GraphQLExtension {
+export class FormatErrorExtension<TContext = any> extends GraphQLExtension {
   private formatError: Function;
   private debug: boolean;
 
@@ -13,9 +13,11 @@ export class FormatErrorExtension extends GraphQLExtension {
 
   public willSendResponse(o: {
     graphqlResponse: GraphQLResponse;
-  }): void | { graphqlResponse: GraphQLResponse } {
+    context: TContext;
+  }): void | { graphqlResponse: GraphQLResponse; context: TContext } {
     if (o.graphqlResponse.errors) {
       return {
+        ...o,
         graphqlResponse: {
           ...o.graphqlResponse,
           errors: formatApolloErrors(o.graphqlResponse.errors, {
diff --git a/packages/apollo-server-core/src/runQuery.ts b/packages/apollo-server-core/src/runQuery.ts
index 12c33fbbaa1..516750dfd78 100644
--- a/packages/apollo-server-core/src/runQuery.ts
+++ b/packages/apollo-server-core/src/runQuery.ts
@@ -135,6 +135,7 @@ function doRunQuery(options: QueryOptions): Promise<GraphQLResponse> {
     variables: options.variables,
     persistedQueryHit: options.persistedQueryHit,
     persistedQueryRegister: options.persistedQueryRegister,
+    context,
   });
   return Promise.resolve()
     .then(
@@ -278,7 +279,10 @@ function doRunQuery(options: QueryOptions): Promise<GraphQLResponse> {
       throw err;
     })
     .then((graphqlResponse: GraphQLResponse) => {
-      const response = extensionStack.willSendResponse({ graphqlResponse });
+      const response = extensionStack.willSendResponse({
+        graphqlResponse,
+        context,
+      });
       requestDidEnd();
       return response.graphqlResponse;
     });
diff --git a/packages/apollo-server-integration-testsuite/src/ApolloServer.ts b/packages/apollo-server-integration-testsuite/src/ApolloServer.ts
index 22981425598..fbe88bbe8ed 100644
--- a/packages/apollo-server-integration-testsuite/src/ApolloServer.ts
+++ b/packages/apollo-server-integration-testsuite/src/ApolloServer.ts
@@ -526,8 +526,11 @@ export function testApolloServer<AS extends ApolloServerBase>(
             return error;
           });
 
-          class Extension extends GraphQLExtension {
-            willSendResponse(o: { graphqlResponse: GraphQLResponse }) {
+          class Extension<TContext = any> extends GraphQLExtension {
+            willSendResponse(o: {
+              graphqlResponse: GraphQLResponse;
+              context: TContext;
+            }) {
               expect(o.graphqlResponse.errors.length).toEqual(1);
               // formatError should be called after extensions
               expect(formatError).not.toBeCalled();
@@ -609,8 +612,11 @@ export function testApolloServer<AS extends ApolloServerBase>(
           return error;
         });
 
-        class Extension extends GraphQLExtension {
-          willSendResponse(_o: { graphqlResponse: GraphQLResponse }) {
+        class Extension<TContext = any> extends GraphQLExtension {
+          willSendResponse(_o: {
+            graphqlResponse: GraphQLResponse;
+            context: TContext;
+          }) {
             // formatError should be called after extensions
             expect(formatError).not.toBeCalled();
             extension();
diff --git a/packages/graphql-extensions/src/index.ts b/packages/graphql-extensions/src/index.ts
index e09457768db..b7f358f6da8 100644
--- a/packages/graphql-extensions/src/index.ts
+++ b/packages/graphql-extensions/src/index.ts
@@ -40,6 +40,7 @@ export class GraphQLExtension<TContext = any> {
     variables?: { [key: string]: any };
     persistedQueryHit?: boolean;
     persistedQueryRegister?: boolean;
+    context: TContext;
   }): EndHandler | void;
   public parsingDidStart?(o: { queryString: string }): EndHandler | void;
   public validationDidStart?(): EndHandler | void;
@@ -49,7 +50,8 @@ export class GraphQLExtension<TContext = any> {
 
   public willSendResponse?(o: {
     graphqlResponse: GraphQLResponse;
-  }): void | { graphqlResponse: GraphQLResponse };
+    context: TContext;
+  }): void | { graphqlResponse: GraphQLResponse; context: TContext };
 
   public willResolveField?(
     source: any,
@@ -78,6 +80,7 @@ export class GraphQLExtensionStack<TContext = any> {
     variables?: { [key: string]: any };
     persistedQueryHit?: boolean;
     persistedQueryRegister?: boolean;
+    context: TContext;
   }): EndHandler {
     return this.handleDidStart(
       ext => ext.requestDidStart && ext.requestDidStart(o),
@@ -104,7 +107,8 @@ export class GraphQLExtensionStack<TContext = any> {
 
   public willSendResponse(o: {
     graphqlResponse: GraphQLResponse;
-  }): { graphqlResponse: GraphQLResponse } {
+    context: TContext;
+  }): { graphqlResponse: GraphQLResponse; context: TContext } {
     let reference = o;
     // Reverse the array, since this is functions as an end handler
     [...this.extensions].reverse().forEach(extension => {