diff --git a/flow-typed/npm/express_v4.16.x.js b/flow-typed/npm/express_v4.16.x.js
new file mode 100644
index 0000000..8a9aab0
--- /dev/null
+++ b/flow-typed/npm/express_v4.16.x.js
@@ -0,0 +1,300 @@
+// flow-typed signature: 106bbf49ff0c0b351c95d483d617ffba
+// flow-typed version: 7fe23c8e85/express_v4.16.x/flow_>=v0.32.x
+
+import type { Server } from "http";
+import type { Socket } from "net";
+
+declare type express$RouterOptions = {
+  caseSensitive?: boolean,
+  mergeParams?: boolean,
+  strict?: boolean
+};
+
+declare class express$RequestResponseBase {
+  app: express$Application;
+  get(field: string): string | void;
+}
+
+declare type express$RequestParams = {
+  [param: string]: string
+};
+
+declare class express$Request extends http$IncomingMessage mixins express$RequestResponseBase {
+  baseUrl: string;
+  body: mixed;
+  cookies: { [cookie: string]: string };
+  connection: Socket;
+  fresh: boolean;
+  hostname: string;
+  ip: string;
+  ips: Array<string>;
+  method: string;
+  originalUrl: string;
+  params: express$RequestParams;
+  path: string;
+  protocol: "https" | "http";
+  query: { [name: string]: string | Array<string> };
+  route: string;
+  secure: boolean;
+  signedCookies: { [signedCookie: string]: string };
+  stale: boolean;
+  subdomains: Array<string>;
+  xhr: boolean;
+  accepts(types: string): string | false;
+  accepts(types: Array<string>): string | false;
+  acceptsCharsets(...charsets: Array<string>): string | false;
+  acceptsEncodings(...encoding: Array<string>): string | false;
+  acceptsLanguages(...lang: Array<string>): string | false;
+  header(field: string): string | void;
+  is(type: string): boolean;
+  param(name: string, defaultValue?: string): string | void;
+}
+
+declare type express$CookieOptions = {
+  domain?: string,
+  encode?: (value: string) => string,
+  expires?: Date,
+  httpOnly?: boolean,
+  maxAge?: number,
+  path?: string,
+  secure?: boolean,
+  signed?: boolean
+};
+
+declare type express$Path = string | RegExp;
+
+declare type express$RenderCallback = (
+  err: Error | null,
+  html?: string
+) => mixed;
+
+declare type express$SendFileOptions = {
+  maxAge?: number,
+  root?: string,
+  lastModified?: boolean,
+  headers?: { [name: string]: string },
+  dotfiles?: "allow" | "deny" | "ignore"
+};
+
+declare class express$Response extends http$ServerResponse mixins express$RequestResponseBase {
+  headersSent: boolean;
+  locals: { [name: string]: mixed };
+  append(field: string, value?: string): this;
+  attachment(filename?: string): this;
+  cookie(name: string, value: string, options?: express$CookieOptions): this;
+  clearCookie(name: string, options?: express$CookieOptions): this;
+  download(
+    path: string,
+    filename?: string,
+    callback?: (err?: ?Error) => void
+  ): this;
+  format(typesObject: { [type: string]: Function }): this;
+  json(body?: mixed): this;
+  jsonp(body?: mixed): this;
+  links(links: { [name: string]: string }): this;
+  location(path: string): this;
+  redirect(url: string, ...args: Array<void>): this;
+  redirect(status: number, url: string, ...args: Array<void>): this;
+  render(
+    view: string,
+    locals?: { [name: string]: mixed },
+    callback?: express$RenderCallback
+  ): this;
+  send(body?: mixed): this;
+  sendFile(
+    path: string,
+    options?: express$SendFileOptions,
+    callback?: (err?: ?Error) => mixed
+  ): this;
+  sendStatus(statusCode: number): this;
+  header(field: string, value?: string): this;
+  header(headers: { [name: string]: string }): this;
+  set(field: string, value?: string | string[]): this;
+  set(headers: { [name: string]: string }): this;
+  status(statusCode: number): this;
+  type(type: string): this;
+  vary(field: string): this;
+  req: express$Request;
+}
+
+declare type express$NextFunction = (err?: ?Error | "route") => mixed;
+declare type express$Middleware =
+  | ((
+      req: $Subtype<express$Request>,
+      res: express$Response,
+      next: express$NextFunction
+    ) => mixed)
+  | ((
+      error: Error,
+      req: $Subtype<express$Request>,
+      res: express$Response,
+      next: express$NextFunction
+    ) => mixed);
+declare interface express$RouteMethodType<T> {
+  (middleware: express$Middleware): T;
+  (...middleware: Array<express$Middleware>): T;
+  (
+    path: express$Path | express$Path[],
+    ...middleware: Array<express$Middleware>
+  ): T;
+}
+declare class express$Route {
+  all: express$RouteMethodType<this>;
+  get: express$RouteMethodType<this>;
+  post: express$RouteMethodType<this>;
+  put: express$RouteMethodType<this>;
+  head: express$RouteMethodType<this>;
+  delete: express$RouteMethodType<this>;
+  options: express$RouteMethodType<this>;
+  trace: express$RouteMethodType<this>;
+  copy: express$RouteMethodType<this>;
+  lock: express$RouteMethodType<this>;
+  mkcol: express$RouteMethodType<this>;
+  move: express$RouteMethodType<this>;
+  purge: express$RouteMethodType<this>;
+  propfind: express$RouteMethodType<this>;
+  proppatch: express$RouteMethodType<this>;
+  unlock: express$RouteMethodType<this>;
+  report: express$RouteMethodType<this>;
+  mkactivity: express$RouteMethodType<this>;
+  checkout: express$RouteMethodType<this>;
+  merge: express$RouteMethodType<this>;
+
+  // @TODO Missing 'm-search' but get flow illegal name error.
+
+  notify: express$RouteMethodType<this>;
+  subscribe: express$RouteMethodType<this>;
+  unsubscribe: express$RouteMethodType<this>;
+  patch: express$RouteMethodType<this>;
+  search: express$RouteMethodType<this>;
+  connect: express$RouteMethodType<this>;
+}
+
+declare class express$Router extends express$Route {
+  constructor(options?: express$RouterOptions): void;
+  route(path: string): express$Route;
+  static (options?: express$RouterOptions): express$Router;
+  use(middleware: express$Middleware): this;
+  use(...middleware: Array<express$Middleware>): this;
+  use(
+    path: express$Path | express$Path[],
+    ...middleware: Array<express$Middleware>
+  ): this;
+  use(path: string, router: express$Router): this;
+  handle(
+    req: http$IncomingMessage,
+    res: http$ServerResponse,
+    next: express$NextFunction
+  ): void;
+  param(
+    param: string,
+    callback: (
+      req: $Subtype<express$Request>,
+      res: express$Response,
+      next: express$NextFunction,
+      id: string
+    ) => mixed
+  ): void;
+
+  // Can't use regular callable signature syntax due to https://github.com/facebook/flow/issues/3084
+  $call: (
+    req: http$IncomingMessage,
+    res: http$ServerResponse,
+    next?: ?express$NextFunction
+  ) => void;
+}
+
+/*
+With flow-bin ^0.59, express app.listen() is deemed to return any and fails flow type coverage.
+Which is ironic because https://github.com/facebook/flow/blob/master/Changelog.md#misc-2 (release notes for 0.59)
+says "Improves typings for Node.js HTTP server listen() function."  See that?  IMPROVES!
+To work around this issue, we changed Server to ?Server here, so that our invocations of express.listen() will
+not be deemed to lack type coverage.
+*/
+
+declare class express$Application extends express$Router mixins events$EventEmitter {
+  constructor(): void;
+  locals: { [name: string]: mixed };
+  mountpath: string;
+  listen(
+    port: number,
+    hostname?: string,
+    backlog?: number,
+    callback?: (err?: ?Error) => mixed
+  ): ?Server;
+  listen(
+    port: number,
+    hostname?: string,
+    callback?: (err?: ?Error) => mixed
+  ): ?Server;
+  listen(port: number, callback?: (err?: ?Error) => mixed): ?Server;
+  listen(path: string, callback?: (err?: ?Error) => mixed): ?Server;
+  listen(handle: Object, callback?: (err?: ?Error) => mixed): ?Server;
+  disable(name: string): void;
+  disabled(name: string): boolean;
+  enable(name: string): express$Application;
+  enabled(name: string): boolean;
+  engine(name: string, callback: Function): void;
+  /**
+   * Mixed will not be taken as a value option. Issue around using the GET http method name and the get for settings.
+   */
+  //   get(name: string): mixed;
+  set(name: string, value: mixed): mixed;
+  render(
+    name: string,
+    optionsOrFunction: { [name: string]: mixed },
+    callback: express$RenderCallback
+  ): void;
+  handle(
+    req: http$IncomingMessage,
+    res: http$ServerResponse,
+    next?: ?express$NextFunction
+  ): void;
+}
+
+declare type JsonOptions = {
+  inflate?: boolean,
+  limit?: string | number,
+  reviver?: (key: string, value: mixed) => mixed,
+  strict?: boolean,
+  type?: string | Array<string> | ((req: express$Request) => boolean),
+  verify?: (
+    req: express$Request,
+    res: express$Response,
+    buf: Buffer,
+    encoding: string
+  ) => mixed
+};
+
+declare type express$UrlEncodedOptions = {
+  extended?: boolean,
+  inflate?: boolean,
+  limit?: string | number,
+  parameterLimit?: number,
+  type?: string | Array<string> | ((req: express$Request) => boolean),
+  verify?: (
+    req: express$Request,
+    res: express$Response,
+    buf: Buffer,
+    encoding: string
+  ) => mixed,
+}
+
+declare module "express" {
+  declare export type RouterOptions = express$RouterOptions;
+  declare export type CookieOptions = express$CookieOptions;
+  declare export type Middleware = express$Middleware;
+  declare export type NextFunction = express$NextFunction;
+  declare export type RequestParams = express$RequestParams;
+  declare export type $Response = express$Response;
+  declare export type $Request = express$Request;
+  declare export type $Application = express$Application;
+
+  declare module.exports: {
+    (): express$Application, // If you try to call like a function, it will use this signature
+    json: (opts: ?JsonOptions) => express$Middleware,
+    static: (root: string, options?: Object) => express$Middleware, // `static` property on the function
+    Router: typeof express$Router, // `Router` property on the function
+    urlencoded: (opts: ?express$UrlEncodedOptions) => express$Middleware,
+  };
+}
diff --git a/package.json b/package.json
index ab1ab6d..cbef899 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "eslint-plugin-import": "2.8.0",
     "eslint-plugin-jsx-a11y": "5.1.1",
     "eslint-plugin-react": "7.4.0",
+    "express": "^4.16.3",
     "extract-text-webpack-plugin": "3.0.2",
     "file-loader": "1.1.5",
     "flow-bin": "^0.65.0",
diff --git a/yarn.lock b/yarn.lock
index 01b6fcb..516f881 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -69,6 +69,13 @@ accepts@~1.3.4:
     mime-types "~2.1.16"
     negotiator "0.6.1"
 
+accepts@~1.3.5:
+  version "1.3.5"
+  resolved "https://registry.yarnpkg.com/accepts/-/accepts-1.3.5.tgz#eb777df6011723a3b14e8a72c0805c8e86746bd2"
+  dependencies:
+    mime-types "~2.1.18"
+    negotiator "0.6.1"
+
 acorn-dynamic-import@^2.0.0:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/acorn-dynamic-import/-/acorn-dynamic-import-2.0.2.tgz#c752bd210bef679501b6c6cb7fc84f8f47158cc4"
@@ -1977,7 +1984,7 @@ depd@1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/depd/-/depd-1.1.1.tgz#5783b4e1c459f06fa5ca27f991f3d06e7a310359"
 
-depd@~1.1.1:
+depd@~1.1.1, depd@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/depd/-/depd-1.1.2.tgz#9bcd52e14c097763e749b274c4346ed2e560b5a9"
 
@@ -2182,7 +2189,7 @@ emojis-list@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/emojis-list/-/emojis-list-2.1.0.tgz#4daa4d9db00f9819880c79fa457ae5b09a1fd389"
 
-encodeurl@~1.0.1:
+encodeurl@~1.0.1, encodeurl@~1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/encodeurl/-/encodeurl-1.0.2.tgz#ad3ff4c86ec2d029322f5a02c3a9a606c95b3f59"
 
@@ -2644,6 +2651,41 @@ express@^4.13.3:
     utils-merge "1.0.1"
     vary "~1.1.2"
 
+express@^4.16.3:
+  version "4.16.3"
+  resolved "https://registry.yarnpkg.com/express/-/express-4.16.3.tgz#6af8a502350db3246ecc4becf6b5a34d22f7ed53"
+  dependencies:
+    accepts "~1.3.5"
+    array-flatten "1.1.1"
+    body-parser "1.18.2"
+    content-disposition "0.5.2"
+    content-type "~1.0.4"
+    cookie "0.3.1"
+    cookie-signature "1.0.6"
+    debug "2.6.9"
+    depd "~1.1.2"
+    encodeurl "~1.0.2"
+    escape-html "~1.0.3"
+    etag "~1.8.1"
+    finalhandler "1.1.1"
+    fresh "0.5.2"
+    merge-descriptors "1.0.1"
+    methods "~1.1.2"
+    on-finished "~2.3.0"
+    parseurl "~1.3.2"
+    path-to-regexp "0.1.7"
+    proxy-addr "~2.0.3"
+    qs "6.5.1"
+    range-parser "~1.2.0"
+    safe-buffer "5.1.1"
+    send "0.16.2"
+    serve-static "1.13.2"
+    setprototypeof "1.1.0"
+    statuses "~1.4.0"
+    type-is "~1.6.16"
+    utils-merge "1.0.1"
+    vary "~1.1.2"
+
 extend@~3.0.0, extend@~3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.1.tgz#a755ea7bc1adfcc5a31ce7e762dbaadc5e636444"
@@ -2795,6 +2837,18 @@ finalhandler@1.1.0:
     statuses "~1.3.1"
     unpipe "~1.0.0"
 
+finalhandler@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/finalhandler/-/finalhandler-1.1.1.tgz#eebf4ed840079c83f4249038c9d703008301b105"
+  dependencies:
+    debug "2.6.9"
+    encodeurl "~1.0.2"
+    escape-html "~1.0.3"
+    on-finished "~2.3.0"
+    parseurl "~1.3.2"
+    statuses "~1.4.0"
+    unpipe "~1.0.0"
+
 find-cache-dir@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/find-cache-dir/-/find-cache-dir-0.1.1.tgz#c8defae57c8a52a8a784f9e31c57c742e993a0b9"
@@ -3498,6 +3552,10 @@ ipaddr.js@1.5.2:
   version "1.5.2"
   resolved "https://registry.yarnpkg.com/ipaddr.js/-/ipaddr.js-1.5.2.tgz#d4b505bde9946987ccf0fc58d9010ff9607e3fa0"
 
+ipaddr.js@1.6.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/ipaddr.js/-/ipaddr.js-1.6.0.tgz#e3fa357b773da619f26e95f049d055c72796f86b"
+
 is-absolute-url@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/is-absolute-url/-/is-absolute-url-2.1.0.tgz#50530dfb84fcc9aa7dbe7852e83a37b93b9f2aa6"
@@ -4578,12 +4636,22 @@ mime-db@~1.30.0:
   version "1.30.0"
   resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.30.0.tgz#74c643da2dd9d6a45399963465b26d5ca7d71f01"
 
+mime-db@~1.33.0:
+  version "1.33.0"
+  resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.33.0.tgz#a3492050a5cb9b63450541e39d9788d2272783db"
+
 mime-types@^2.1.12, mime-types@~2.1.15, mime-types@~2.1.16, mime-types@~2.1.17, mime-types@~2.1.7:
   version "2.1.17"
   resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.17.tgz#09d7a393f03e995a79f8af857b70a9e0ab16557a"
   dependencies:
     mime-db "~1.30.0"
 
+mime-types@~2.1.18:
+  version "2.1.18"
+  resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.18.tgz#6f323f60a83d11146f831ff11fd66e2fe5503bb8"
+  dependencies:
+    mime-db "~1.33.0"
+
 mime@1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/mime/-/mime-1.4.1.tgz#121f9ebc49e3766f311a76e1fa1c8003c4b03aa6"
@@ -5582,6 +5650,13 @@ proxy-addr@~2.0.2:
     forwarded "~0.1.2"
     ipaddr.js "1.5.2"
 
+proxy-addr@~2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-2.0.3.tgz#355f262505a621646b3130a728eb647e22055341"
+  dependencies:
+    forwarded "~0.1.2"
+    ipaddr.js "1.6.0"
+
 prr@~1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/prr/-/prr-1.0.1.tgz#d3fc114ba06995a45ec6893f484ceb1d78f5f476"
@@ -6186,6 +6261,24 @@ send@0.16.1:
     range-parser "~1.2.0"
     statuses "~1.3.1"
 
+send@0.16.2:
+  version "0.16.2"
+  resolved "https://registry.yarnpkg.com/send/-/send-0.16.2.tgz#6ecca1e0f8c156d141597559848df64730a6bbc1"
+  dependencies:
+    debug "2.6.9"
+    depd "~1.1.2"
+    destroy "~1.0.4"
+    encodeurl "~1.0.2"
+    escape-html "~1.0.3"
+    etag "~1.8.1"
+    fresh "0.5.2"
+    http-errors "~1.6.2"
+    mime "1.4.1"
+    ms "2.0.0"
+    on-finished "~2.3.0"
+    range-parser "~1.2.0"
+    statuses "~1.4.0"
+
 serve-index@^1.7.2:
   version "1.9.1"
   resolved "https://registry.yarnpkg.com/serve-index/-/serve-index-1.9.1.tgz#d3768d69b1e7d82e5ce050fff5b453bea12a9239"
@@ -6207,6 +6300,15 @@ serve-static@1.13.1:
     parseurl "~1.3.2"
     send "0.16.1"
 
+serve-static@1.13.2:
+  version "1.13.2"
+  resolved "https://registry.yarnpkg.com/serve-static/-/serve-static-1.13.2.tgz#095e8472fd5b46237db50ce486a43f4b86c6cec1"
+  dependencies:
+    encodeurl "~1.0.2"
+    escape-html "~1.0.3"
+    parseurl "~1.3.2"
+    send "0.16.2"
+
 serviceworker-cache-polyfill@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/serviceworker-cache-polyfill/-/serviceworker-cache-polyfill-4.0.0.tgz#de19ee73bef21ab3c0740a37b33db62464babdeb"
@@ -6398,7 +6500,7 @@ staged-git-files@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/staged-git-files/-/staged-git-files-1.0.0.tgz#cdb847837c1fcc52c08a872d4883cc0877668a80"
 
-"statuses@>= 1.3.1 < 2":
+"statuses@>= 1.3.1 < 2", statuses@~1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.4.0.tgz#bb73d446da2796106efcc1b601a253d6c46bd087"
 
@@ -6758,6 +6860,13 @@ type-is@~1.6.15:
     media-typer "0.3.0"
     mime-types "~2.1.15"
 
+type-is@~1.6.16:
+  version "1.6.16"
+  resolved "https://registry.yarnpkg.com/type-is/-/type-is-1.6.16.tgz#f89ce341541c672b25ee7ae3c73dee3b2be50194"
+  dependencies:
+    media-typer "0.3.0"
+    mime-types "~2.1.18"
+
 typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"