diff --git a/README.md b/README.md
index 52666390e..32b86f8dc 100644
--- a/README.md
+++ b/README.md
@@ -31,8 +31,7 @@ and more! You can touch with your own eyes at https://misskey.xyz/.
 2. `git clone git://github.com/syuilo/misskey.git`
 3. `cd misskey`
 4. `npm install`
-5. `npm run config`
-6. `npm run build`
+5. `npm run build`
 
 GLHF!
 
@@ -92,6 +91,7 @@ If you want to run misskey in production mode, add `--env NODE_ENV=production` l
 Note that `$(pwd)` is the working directory.
 
 ## Launch
+(初回起動時はまず `npm run config` してください)
 `sudo npm start`
 
 ## Debugging :bug:
diff --git a/src/web/app/boot.js b/src/web/app/boot.js
index 5fc752462..d39e46861 100644
--- a/src/web/app/boot.js
+++ b/src/web/app/boot.js
@@ -17,11 +17,13 @@ require('./common/tags');
 
 "use strict";
 
+const CONFIG = require('./common/scripts/config');
+
 document.domain = CONFIG.host;
 
 // Set global configration
 riot.mixin({
-	CONFIG: CONFIG
+	CONFIG
 });
 
 // ↓ iOS待ちPolyfill (SEE: http://caniuse.com/#feat=fetch)
diff --git a/src/web/app/common/scripts/api.js b/src/web/app/common/scripts/api.js
index b549fe47b..be72f863d 100644
--- a/src/web/app/common/scripts/api.js
+++ b/src/web/app/common/scripts/api.js
@@ -2,6 +2,8 @@
  * API Request
  */
 
+const CONFIG = require('./config');
+
 let spinner = null;
 let pending = 0;
 
diff --git a/src/web/app/common/scripts/config.js b/src/web/app/common/scripts/config.js
new file mode 100644
index 000000000..512340241
--- /dev/null
+++ b/src/web/app/common/scripts/config.js
@@ -0,0 +1,18 @@
+const url = new URL(location.href);
+
+const isRoot = url.host.split('.')[0] == 'misskey';
+
+const host = isRoot ? url.host : url.host.substring(url.host.indexOf('.') + 1, url.host.length);
+const scheme = url.protocol;
+const apiUrl = `${scheme}//api.${host}`;
+const devUrl = `${scheme}//dev.${host}`;
+const aboutUrl = `${scheme}//about.${host}`;
+
+module.exports = {
+	host,
+	scheme,
+	apiUrl,
+	devUrl,
+	aboutUrl,
+	themeColor: '#f76d6c'
+};
diff --git a/src/web/app/common/scripts/messaging-stream.js b/src/web/app/common/scripts/messaging-stream.js
index 2c00c2402..0c8ce3c9d 100644
--- a/src/web/app/common/scripts/messaging-stream.js
+++ b/src/web/app/common/scripts/messaging-stream.js
@@ -1,5 +1,6 @@
 const ReconnectingWebSocket = require('reconnecting-websocket');
 const riot = require('riot');
+const CONFIG = require('./config');
 
 class Connection {
 	constructor(me, otherparty) {
diff --git a/src/web/app/common/scripts/signout.js b/src/web/app/common/scripts/signout.js
index cd752423d..7242ebc5b 100644
--- a/src/web/app/common/scripts/signout.js
+++ b/src/web/app/common/scripts/signout.js
@@ -1,3 +1,5 @@
+const CONFIG = require('./config');
+
 module.exports = () => {
 	localStorage.removeItem('me');
 	document.cookie = `i=; domain=.${CONFIG.host}; expires=Thu, 01 Jan 1970 00:00:01 GMT;`;
diff --git a/src/web/app/common/scripts/stream.js b/src/web/app/common/scripts/stream.js
index 34ddc8447..fd7bac7fa 100644
--- a/src/web/app/common/scripts/stream.js
+++ b/src/web/app/common/scripts/stream.js
@@ -1,5 +1,6 @@
 const ReconnectingWebSocket = require('reconnecting-websocket');
 const riot = require('riot');
+const CONFIG = require('./config');
 
 module.exports = me => {
 	let state = 'initializing';
diff --git a/src/web/app/common/scripts/text-compiler.js b/src/web/app/common/scripts/text-compiler.js
index 62e70463a..c9eb73e87 100644
--- a/src/web/app/common/scripts/text-compiler.js
+++ b/src/web/app/common/scripts/text-compiler.js
@@ -1,5 +1,6 @@
 const riot = require('riot');
 const nyaize = require('nyaize').default;
+const CONFIG = require('./config');
 
 const escape = function(text) {
 	return text
diff --git a/src/web/app/common/tags/signup.tag b/src/web/app/common/tags/signup.tag
index f0358e232..a70399a87 100644
--- a/src/web/app/common/tags/signup.tag
+++ b/src/web/app/common/tags/signup.tag
@@ -30,7 +30,7 @@
 		</label>
 		<label class="recaptcha">
 			<p class="caption"><i class="fa fa-toggle-on" if={ recaptchaed }></i><i class="fa fa-toggle-off" if={ !recaptchaed }></i>認証</p>
-			<div class="g-recaptcha" data-callback="onRecaptchaed" data-expired-callback="onRecaptchaExpired" data-sitekey={ CONFIG.recaptcha.siteKey }></div>
+			<div if={ recaptcha } class="g-recaptcha" data-callback="onRecaptchaed" data-expired-callback="onRecaptchaExpired" data-sitekey={ recaptcha.siteKey }></div>
 		</label>
 		<label class="agree-tou">
 			<input name="agree-tou" type="checkbox" autocomplete="off" required="required"/>
@@ -193,10 +193,20 @@
 		};
 
 		this.on('mount', () => {
-			const head = document.getElementsByTagName('head')[0];
-			const script = document.createElement('script');
-			script.setAttribute('src', 'https://www.google.com/recaptcha/api.js');
-			head.appendChild(script);
+			fetch('/config.json').then(res => {
+				res.json().then(conf => {
+					this.update({
+						recaptcha: {
+							siteKey: conf.recaptcha.siteKey
+						}
+					});
+
+					const head = document.getElementsByTagName('head')[0];
+					const script = document.createElement('script');
+					script.setAttribute('src', 'https://www.google.com/recaptcha/api.js');
+					head.appendChild(script);
+				});
+			});
 		});
 
 		this.onChangeUsername = () => {
diff --git a/src/web/app/desktop/scripts/update-avatar.js b/src/web/app/desktop/scripts/update-avatar.js
index c9bf86615..f3c4594ff 100644
--- a/src/web/app/desktop/scripts/update-avatar.js
+++ b/src/web/app/desktop/scripts/update-avatar.js
@@ -1,4 +1,5 @@
 const riot = require('riot');
+const CONFIG = require('../../common/scripts/config');
 const dialog = require('./dialog');
 const api = require('../../common/scripts/api');
 
diff --git a/src/web/app/desktop/scripts/update-banner.js b/src/web/app/desktop/scripts/update-banner.js
index 2ee918db8..51a107cf4 100644
--- a/src/web/app/desktop/scripts/update-banner.js
+++ b/src/web/app/desktop/scripts/update-banner.js
@@ -1,4 +1,5 @@
 const riot = require('riot');
+const CONFIG = require('../../common/scripts/config');
 const dialog = require('./dialog');
 const api = require('../../common/scripts/api');
 
diff --git a/src/web/server.ts b/src/web/server.ts
index 72f6df598..70083753b 100644
--- a/src/web/server.ts
+++ b/src/web/server.ts
@@ -51,6 +51,17 @@ app.get(/\/api:meta/, require('./meta'));
 app.get(/\/api:url/,  require('./service/url-preview'));
 app.post(/\/api:rss/, require('./service/rss-proxy'));
 
+/**
+ * Serve config
+ */
+app.get('/config.json', (req, res) => {
+	res.send({
+		recaptcha: {
+			siteKey: config.recaptcha.siteKey
+		}
+	});
+});
+
 /**
  * Subdomain
  */