diff --git a/README.md b/README.md
index f55d183..79a6dfb 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 # foris-js
+Set of utils and common React elements for reForis.
 
 ## Publishing package
 
diff --git a/package-lock.json b/package-lock.json
index 04e4540..12c5734 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "foris",
-  "version": "1.4.0",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 4b44a5c..d2ca0d5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "foris",
-  "version": "1.4.0",
+  "version": "2.0.0",
   "description": "Set of components and utils for Foris and its plugins.",
   "author": "CZ.NIC, z.s.p.o.",
   "repository": {
diff --git a/scripts/collect_files.sh b/scripts/collect_files.sh
index 6d45f1b..33fd3f2 100644
--- a/scripts/collect_files.sh
+++ b/scripts/collect_files.sh
@@ -2,7 +2,7 @@
 
 # Collect files
 npm run build
-cp package.json dist
+cp package.json README.md dist
 cp -rf translations dist
 # Remove unwanted files
 rm -rf dist/**/__tests__
diff --git a/src/api/hooks.js b/src/api/hooks.js
index 0429d57..b5f00d0 100644
--- a/src/api/hooks.js
+++ b/src/api/hooks.js
@@ -17,13 +17,13 @@ import {
 const DATA_METHODS = ["POST", "PATCH", "PUT"];
 
 function createAPIHook(method) {
-    return (url, contentType) => {
+    return (urlRoot, contentType) => {
         const [state, dispatch] = useReducer(APIReducer, {
             state: API_STATE.INIT,
             data: null,
         });
 
-        const sendRequest = useCallback(async (data) => {
+        const sendRequest = useCallback(async ({ data, suffix } = {}) => {
             const headers = { ...HEADERS };
             if (contentType) {
                 headers["Content-Type"] = contentType;
@@ -31,17 +31,23 @@ function createAPIHook(method) {
 
             dispatch({ type: API_ACTIONS.INIT });
             try {
+                // Prepare request
                 const request = API_METHODS[method];
                 const config = {
                     timeout: TIMEOUT,
                     headers,
                 };
+                const url = suffix ? `${urlRoot}/${suffix}` : urlRoot;
+
+                // Make request
                 let result;
                 if (DATA_METHODS.includes(method)) {
                     result = await request(url, data, config);
                 } else {
                     result = await request(url, config);
                 }
+
+                // Process request result
                 dispatch({
                     type: API_ACTIONS.SUCCESS,
                     payload: result.data,
@@ -53,7 +59,7 @@ function createAPIHook(method) {
                     payload: getErrorPayload(error),
                 });
             }
-        }, [url, contentType]);
+        }, [urlRoot, contentType]);
         return [state, sendRequest];
     };
 }
diff --git a/src/bootstrap/Spinner.js b/src/bootstrap/Spinner.js
index 33cca31..07e856f 100644
--- a/src/bootstrap/Spinner.js
+++ b/src/bootstrap/Spinner.js
@@ -46,6 +46,8 @@ export function Spinner({
 SpinnerElement.propTypes = {
     /** Spinner's size */
     small: PropTypes.bool,
+    /** Additional className */
+    className: PropTypes.string,
     /** Children components */
     children: PropTypes.oneOfType([
         PropTypes.arrayOf(PropTypes.node),
@@ -53,13 +55,16 @@ SpinnerElement.propTypes = {
     ]),
 };
 
-export function SpinnerElement({ small, children }) {
+export function SpinnerElement({ small, className, children }) {
     return (
         <>
-            <div className={`spinner-border ${small ? "spinner-border-sm" : ""}`} role="status">
+            <div
+                className={`spinner-border ${small ? "spinner-border-sm" : ""} ${className || ""}`.trim()}
+                role="status"
+            >
                 <span className="sr-only" />
             </div>
-            <div className="spinner-text">{children}</div>
+            {children && <div className="spinner-text">{children}</div>}
         </>
     );
 }
diff --git a/src/form/components/ForisForm.js b/src/form/components/ForisForm.js
index 86b552b..80e3821 100644
--- a/src/form/components/ForisForm.js
+++ b/src/form/components/ForisForm.js
@@ -20,14 +20,16 @@ import { useForisModule, useForm } from "../hooks";
 import { STATES as SUBMIT_BUTTON_STATES, SubmitButton } from "./SubmitButton";
 
 ForisForm.propTypes = {
-    /** WebSocket object see `scr/common/WebSockets.js`. */
+    /** Optional WebSocket object. See `scr/common/WebSockets.js`.
+     * `forisConfig.wsModule` should be specified when it's passed.
+     *  */
     ws: PropTypes.object,
     /** Foris configuration object. See usage in main components. */
     forisConfig: PropTypes.shape({
         /** reForis Flask aplication API endpoint from `src/common/API.js`. */
         endpoint: PropTypes.string.isRequired,
         /** `foris-controller` module name to be used via WebSockets.
-         *  If it's not passed then WebSockets aren't used
+         *  It can be use only with `ws` prop.
          * */
         wsModule: PropTypes.string,
         /** `foris-controller` action name to be used via WebSockets.
@@ -49,6 +51,17 @@ ForisForm.propTypes = {
     children: PropTypes.node.isRequired,
     /** Optional override of form submit callback */
     onSubmitOverridden: PropTypes.func,
+
+    // eslint-disable-next-line react/no-unused-prop-types
+    customWSProp(props) {
+        const wsModuleIsSpecified = !!(props.forisConfig && props.forisConfig.wsModule);
+        if (props.ws && !wsModuleIsSpecified) {
+            return new Error("forisConfig.wsModule should be specified when ws object is passed.");
+        }
+        if (!props.ws && wsModuleIsSpecified) {
+            return new Error("forisConfig.wsModule is specified without passing ws object.");
+        }
+    },
 };
 
 ForisForm.defaultProps = {
@@ -103,7 +116,7 @@ export function ForisForm({
         resetFormData();
         const copiedFormData = JSON.parse(JSON.stringify(formState.data));
         const preparedData = prepDataToSubmit(copiedFormData);
-        post(preparedData);
+        post({ data: preparedData });
     }
 
     function getSubmitButtonState() {
diff --git a/src/utils/__tests__/__snapshots__/conditionalHOCs.test.js.snap b/src/utils/__tests__/__snapshots__/conditionalHOCs.test.js.snap
index f2e1040..3a178ea 100644
--- a/src/utils/__tests__/__snapshots__/conditionalHOCs.test.js.snap
+++ b/src/utils/__tests__/__snapshots__/conditionalHOCs.test.js.snap
@@ -26,16 +26,13 @@ exports[`conditional HOCs withSpinner should render spinner 1`] = `
     class="spinner-wrapper my-3 text-center"
   >
     <div
-      class="spinner-border "
+      class="spinner-border"
       role="status"
     >
       <span
         class="sr-only"
       />
     </div>
-    <div
-      class="spinner-text"
-    />
   </div>
 </div>
 `;
@@ -46,16 +43,13 @@ exports[`conditional HOCs withSpinnerOnSending should render spinner 1`] = `
     class="spinner-wrapper my-3 text-center"
   >
     <div
-      class="spinner-border "
+      class="spinner-border"
       role="status"
     >
       <span
         class="sr-only"
       />
     </div>
-    <div
-      class="spinner-text"
-    />
   </div>
 </div>
 `;
diff --git a/src/webSockets/WebSockets.js b/src/webSockets/WebSockets.js
index 6fb9c50..c01407f 100644
--- a/src/webSockets/WebSockets.js
+++ b/src/webSockets/WebSockets.js
@@ -61,9 +61,36 @@ export class WebSockets {
         return this;
     }
 
-    subscribe(params) {
+    subscribe(module) {
         this.waitForConnection(() => {
-            this.send("subscribe", params);
+            this.send("subscribe", module);
+        });
+        return this;
+    }
+
+    unbind(module, action, callback) {
+        const callbacks = this.callbacks[module][action];
+
+        const index = callbacks.indexOf(callback);
+        if (index !== -1) {
+            callbacks.splice(index, 1);
+        }
+
+        if (callbacks.length === 0) {
+            delete this.callbacks[module][action];
+        }
+
+        if (Object.keys(this.callbacks[module]).length === 0) {
+            this.unsubscribe(module);
+        }
+
+        return this;
+    }
+
+    unsubscribe(module) {
+        this.waitForConnection(() => {
+            this.send("unsubscribe", module);
+            delete this.callbacks[module];
         });
         return this;
     }
@@ -82,15 +109,15 @@ export class WebSockets {
         let chain;
         try {
             chain = this.callbacks[json.module][json.action];
-        } catch (e) {
-            if (e instanceof TypeError) {
-                console.log(`Callback for this message wasn't found:${e.data}`);
-            } else throw e;
+        } catch (error) {
+            if (error instanceof TypeError) {
+                console.log(`Callback for this message wasn't found:${error.data}`);
+            } else throw error;
         }
 
         if (typeof chain === "undefined") return;
 
-        for (let i = 0; i < chain.length; i++) chain[i](json);
+        chain.forEach((callback) => callback(json));
     }
 
     close() {
diff --git a/src/webSockets/hooks.js b/src/webSockets/hooks.js
index 3ca0084..7357ead 100644
--- a/src/webSockets/hooks.js
+++ b/src/webSockets/hooks.js
@@ -11,12 +11,21 @@ export function useWSForisModule(ws, module, action = "update_settings") {
     const [data, setData] = useState(null);
 
     useEffect(() => {
-        if (ws && module) {
-            ws.subscribe(module)
-                .bind(module, action, (msg) => {
-                    setData(msg.data);
-                });
+        // Sometimes we want to disable this hook if WS is not passed. We can't make conditional
+        // hooks, but we can disable it here. It's used especially in ForisForm when a module
+        // doesn't present any WS endpoint.
+        if (!ws) return;
+
+        function callback(msg) {
+            setData(msg.data);
         }
+
+        ws.subscribe(module)
+            .bind(module, action, callback);
+
+        return () => {
+            ws.unbind(module, action, callback);
+        };
     }, [action, module, ws]);
 
     return [data];