diff --git a/build.sh b/build.sh
index c6d05dc..f449df8 100644
--- a/build.sh
+++ b/build.sh
@@ -21,7 +21,7 @@ show_usage() {
 
 clean() {
   : 'Clean repo and delete all built files'
-  rm -rf build
+  rm -rf build yarn-error.log
 }
 
 build-css() {
@@ -39,6 +39,7 @@ build-js() {
 
 build-assets() {
   : 'Move assets not handled by sass and typescript to build dir'
+  mkdir -p build/assets
   cp src/assets/*.ico build/assets
 }
 
@@ -50,7 +51,8 @@ watch() {
     --kill-others \
     --success first \
     "build-js --watch" \
-    "build-css --watch" "nodemon ."
+    "build-css --watch" \
+    "nodemon ."
 }
 
 build() {
diff --git a/conf/config.json5 b/conf/config.json5
new file mode 100644
index 0000000..15ddf3f
--- /dev/null
+++ b/conf/config.json5
@@ -0,0 +1,27 @@
+{
+  ssh: {
+    // user:  'username', // default user to use when ssh-ing
+    host: 'localhost', // Server to ssh to
+    auth: 'password', // shh authentication, method. Defaults to "password", you can use "publickey,password" instead'
+    // pass: "password", // Password to use when sshing
+    // key: "", // path to an optional client private key, connection will be password-less and insecure!
+    port: 22, // Port to ssh to
+    knownHosts: '/dev/null', // ssh knownHosts file to use
+  },
+  server:  {
+    base: '/wetty/', // URL base to serve resources from
+    port: 3000, // Port to listen on
+    host: '0.0.0.0', // address to listen on
+    title: 'WeTTy - The Web Terminal Emulator', // Page title
+    bypassHelmet: false, // Disable Helmet security checks
+  },
+
+  forceSSH: false, // Force sshing to local machine over login if running as root
+  command: 'login', // Command to run on server. Login will use ssh if connecting to different server
+  /*
+  ssl:{
+    key: 'ssl.key',
+    cert: 'ssl.cert',
+  }
+  */
+}
diff --git a/src/client/wetty.ts b/src/client/wetty.ts
index b7949c9..2b47f76 100644
--- a/src/client/wetty.ts
+++ b/src/client/wetty.ts
@@ -1,14 +1,17 @@
-import _ from 'lodash';
-import { dom, library } from '@fortawesome/fontawesome-svg-core';
-import { faCogs } from '@fortawesome/free-solid-svg-icons';
+import _ from '/../web_modules/lodash.js';
+import {
+  dom,
+  library,
+} from '/../web_modules/@fortawesome/fontawesome-svg-core.js';
+import { faCogs } from '/../web_modules/@fortawesome/free-solid-svg-icons.js';
 
-import { FileDownloader } from './wetty/download';
-import { disconnect } from './wetty/disconnect';
-import { mobileKeyboard } from './wetty/mobile';
-import { overlay } from './shared/elements';
-import { socket } from './wetty/socket';
-import { verifyPrompt } from './shared/verify';
-import { terminal } from './wetty/term';
+import { FileDownloader } from './wetty/download.js';
+import { disconnect } from './wetty/disconnect.js';
+import { mobileKeyboard } from './wetty/mobile.js';
+import { overlay } from './shared/elements.js';
+import { socket } from './wetty/socket.js';
+import { verifyPrompt } from './shared/verify.js';
+import { terminal } from './wetty/term.js';
 
 // Setup for fontawesome
 library.add(faCogs);
diff --git a/src/client/wetty/disconnect.ts b/src/client/wetty/disconnect.ts
index 88547d8..3535fb0 100644
--- a/src/client/wetty/disconnect.ts
+++ b/src/client/wetty/disconnect.ts
@@ -1,4 +1,4 @@
-import _ from 'lodash';
+import _ from '/../web_modules/lodash.js';
 import { verifyPrompt } from '../shared/verify';
 import { overlay } from '../shared/elements';
 
diff --git a/src/client/wetty/download.ts b/src/client/wetty/download.ts
index 0250486..286c8c0 100644
--- a/src/client/wetty/download.ts
+++ b/src/client/wetty/download.ts
@@ -1,5 +1,6 @@
-import Toastify from 'toastify-js';
-import fileType from 'file-type';
+// @ts-ignore
+import Toastify from '/../web_modules/toastify-js.js';
+import fileType from '/../web_modules/file-type.js';
 
 const DEFAULT_FILE_BEGIN = '\u001b[5i';
 const DEFAULT_FILE_END = '\u001b[4i';
diff --git a/src/client/wetty/mobile.ts b/src/client/wetty/mobile.ts
index 014c791..6fda8a3 100644
--- a/src/client/wetty/mobile.ts
+++ b/src/client/wetty/mobile.ts
@@ -1,4 +1,4 @@
-import _ from 'lodash';
+import _ from '/../web_modules/lodash.js';
 
 export function mobileKeyboard(): void {
   const [screen] = document.getElementsByClassName('xterm-screen');
diff --git a/src/client/wetty/shared/type.ts b/src/client/wetty/shared/type.ts
index 44d68e6..3619019 100644
--- a/src/client/wetty/shared/type.ts
+++ b/src/client/wetty/shared/type.ts
@@ -1,4 +1,4 @@
-import { Terminal } from 'xterm';
+import { Terminal } from '/../../web_modules/xterm.js';
 
 export class Term extends Terminal {
   resizeTerm(): void {}
diff --git a/src/client/wetty/socket.ts b/src/client/wetty/socket.ts
index 4195c8d..781531c 100644
--- a/src/client/wetty/socket.ts
+++ b/src/client/wetty/socket.ts
@@ -1,4 +1,4 @@
-import io from 'socket.io-client';
+import io from '/../../web_modules/socket.io-client.js';
 
 const userRegex = new RegExp('ssh/[^/]+$');
 export const trim = (str: string): string => str.replace(/\/*$/, '');
diff --git a/src/client/wetty/term.ts b/src/client/wetty/term.ts
index 04f8290..2b5fb41 100644
--- a/src/client/wetty/term.ts
+++ b/src/client/wetty/term.ts
@@ -1,11 +1,11 @@
-import _ from 'lodash';
+import _ from '/../web_modules/lodash.js';
 import type { Socket } from 'socket.io-client';
-import { FitAddon } from 'xterm-addon-fit';
-import { Terminal } from 'xterm';
+import { FitAddon } from '/../web_modules/xterm-addon-fit.js';
+import { Terminal } from '/../web_modules/xterm.js';
 
 import type { Term } from './shared/type';
-import { configureTerm } from './term/confiruragtion';
-import { terminal as termElement } from '../shared/elements';
+import { configureTerm } from './term/confiruragtion.js';
+import { terminal as termElement } from '../shared/elements.js';
 
 export function terminal(socket: typeof Socket): Term | undefined {
   const term = new Terminal() as Term;
diff --git a/src/client/wetty/term/confiruragtion.ts b/src/client/wetty/term/confiruragtion.ts
index 22487da..e1d9aa9 100644
--- a/src/client/wetty/term/confiruragtion.ts
+++ b/src/client/wetty/term/confiruragtion.ts
@@ -1,4 +1,4 @@
-import _ from 'lodash';
+import _ from '/../../web_modules/lodash.js';
 
 import type { Term } from '../shared/type';
 import { copySelected, copyShortcut } from './confiruragtion/clipboard';
diff --git a/src/client/wetty/term/confiruragtion/load.ts b/src/client/wetty/term/confiruragtion/load.ts
index ecfcae6..f5dfe36 100644
--- a/src/client/wetty/term/confiruragtion/load.ts
+++ b/src/client/wetty/term/confiruragtion/load.ts
@@ -1,4 +1,4 @@
-import _ from 'lodash';
+import _ from '/../../../web_modules/lodash.js';
 
 export function loadOptions(): object {
   const defaultOptions = { fontSize: 14 };
diff --git a/src/main.ts b/src/main.ts
index 62b66b3..1f8d497 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -3,17 +3,15 @@
  * @module WeTTy
  */
 import yargs from 'yargs';
-import isUndefined from 'lodash/isUndefined';
-import { logger } from './shared/logger';
-import {
-  sshDefault,
-  serverDefault,
-  forceSSHDefault,
-  defaultCommand,
-} from './shared/defaults';
-import { startServer } from './server';
+import { logger } from './shared/logger.js';
+import { startServer } from './server.js';
+import { loadConfigFile, mergeCliConf } from './shared/config.js';
 
 const opts = yargs
+  .options('conf', {
+    type: 'string',
+    description: 'config file to load config from',
+  })
   .option('ssl-key', {
     type: 'string',
     description: 'path to SSL key',
@@ -25,78 +23,64 @@ const opts = yargs
   .option('ssh-host', {
     description: 'ssh server host',
     type: 'string',
-    default: sshDefault.host,
   })
   .option('ssh-port', {
     description: 'ssh server port',
     type: 'number',
-    default: sshDefault.port,
   })
   .option('ssh-user', {
     description: 'ssh user',
     type: 'string',
-    default: sshDefault.user,
   })
   .option('title', {
     description: 'window title',
     type: 'string',
-    default: serverDefault.title,
   })
   .option('ssh-auth', {
     description:
       'defaults to "password", you can use "publickey,password" instead',
     type: 'string',
-    default: sshDefault.auth,
   })
   .option('ssh-pass', {
     description: 'ssh password',
     type: 'string',
-    default: sshDefault.pass,
   })
   .option('ssh-key', {
     demand: false,
     description:
       'path to an optional client private key (connection will be password-less and insecure!)',
     type: 'string',
-    default: sshDefault.key,
   })
   .option('force-ssh', {
     description: 'Connecting through ssh even if running as root',
     type: 'boolean',
-    default: forceSSHDefault,
   })
   .option('known-hosts', {
     description: 'path to known hosts file',
     type: 'string',
-    default: sshDefault.knownHosts,
   })
   .option('base', {
     alias: 'b',
     description: 'base path to wetty',
     type: 'string',
-    default: serverDefault.base,
   })
   .option('port', {
     alias: 'p',
     description: 'wetty listen port',
     type: 'number',
-    default: serverDefault.port,
   })
   .option('host', {
     description: 'wetty listen host',
-    default: serverDefault.host,
     type: 'string',
   })
   .option('command', {
     alias: 'c',
     description: 'command to run in shell',
     type: 'string',
-    default: defaultCommand,
   })
   .option('bypass-helmet', {
     description: 'disable helmet from placing security restrictions',
     type: 'boolean',
-    default: serverDefault.bypassHelmet,
   })
   .option('help', {
     alias: 'h',
@@ -104,33 +88,23 @@ const opts = yargs
     description: 'Print help message',
   })
   .boolean('allow_discovery').argv;
+
 if (!opts.help) {
-  startServer(
-    {
-      user: opts['ssh-user'],
-      host: opts['ssh-host'],
-      auth: opts['ssh-auth'],
-      port: opts['ssh-port'],
-      pass: opts['ssh-pass'],
-      key: opts['ssh-key'],
-      knownHosts: opts['known-hosts'],
-    },
-    {
-      base: opts.base,
-      host: opts.host,
-      port: opts.port,
-      title: opts.title,
-      bypassHelmet: opts['bypass-helmet'],
-    },
-    opts.command,
-    opts['force-ssh'],
-    isUndefined(opts['ssl-key']) || isUndefined(opts['ssl-cert'])
-      ? undefined
-      : { key: opts['ssl-key'], cert: opts['ssl-cert'] },
-  ).catch((err: Error) => {
-    logger.error(err);
-    process.exitCode = 1;
-  });
+  (async () => {
+    const config = await loadConfigFile(opts.conf);
+    const conf = mergeCliConf(opts, config);
+    console.log(conf);
+    startServer(
+      conf.ssh,
+      conf.server,
+      conf.command,
+      conf.forceSSH,
+      conf.ssl,
+    ).catch(err => {
+      logger.error(err);
+      process.exitCode = 1;
+    });
+  })();
 } else {
   yargs.showHelp();
   process.exitCode = 0;
diff --git a/src/server.ts b/src/server.ts
index d433c7b..4fcdc8e 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -2,18 +2,18 @@
  * Create WeTTY server
  * @module WeTTy
  */
-import type { SSH, SSL, Server } from './shared/interfaces';
-import { getCommand } from './server/command';
-import { logger } from './shared/logger';
-import { login } from './server/login';
-import { server } from './server/socketServer';
-import { spawn } from './server/spawn';
+import type { SSH, SSL, Server } from './shared/interfaces.js';
+import { getCommand } from './server/command.js';
+import { logger } from './shared/logger.js';
+import { login } from './server/login.js';
+import { server } from './server/socketServer.js';
+import { spawn } from './server/spawn.js';
 import {
   sshDefault,
   serverDefault,
   forceSSHDefault,
   defaultCommand,
-} from './shared/defaults';
+} from './shared/defaults.js';
 
 /**
  * Starts WeTTy Server
diff --git a/src/server/command.ts b/src/server/command.ts
index e6302e2..e44b815 100644
--- a/src/server/command.ts
+++ b/src/server/command.ts
@@ -1,9 +1,9 @@
 import url from 'url';
 import { Socket } from 'socket.io';
-import { SSH } from '../shared/interfaces';
-import { address } from './command/address';
-import { loginOptions } from './command/login';
-import { sshOptions } from './command/ssh';
+import { SSH } from '../shared/interfaces.js';
+import { address } from './command/address.js';
+import { loginOptions } from './command/login.js';
+import { sshOptions } from './command/ssh.js';
 
 const localhost = (host: string): boolean =>
   process.getuid() === 0 &&
diff --git a/src/server/command/ssh.ts b/src/server/command/ssh.ts
index cf521a1..6e3a2a6 100644
--- a/src/server/command/ssh.ts
+++ b/src/server/command/ssh.ts
@@ -1,5 +1,5 @@
 import isUndefined from 'lodash/isUndefined.js';
-import { logger } from '../../shared/logger';
+import { logger } from '../../shared/logger.js';
 
 export function sshOptions(
   {
diff --git a/src/server/login.ts b/src/server/login.ts
index 756cd47..6cc035b 100644
--- a/src/server/login.ts
+++ b/src/server/login.ts
@@ -1,5 +1,5 @@
 import pty from 'node-pty';
-import { xterm } from './shared/xterm';
+import { xterm } from './shared/xterm.js';
 
 export function login(socket: SocketIO.Socket): Promise<string> {
   // Check request-header for username
diff --git a/src/server/socketServer.ts b/src/server/socketServer.ts
index a9199dc..372ddac 100644
--- a/src/server/socketServer.ts
+++ b/src/server/socketServer.ts
@@ -3,13 +3,13 @@ import compression from 'compression';
 import helmet from 'helmet';
 import winston from 'express-winston';
 
-import type { SSL, SSLBuffer, Server } from '../shared/interfaces';
-import { favicon, redirect } from './socketServer/middleware';
-import { html } from './socketServer/html';
-import { listen } from './socketServer/socket';
-import { logger } from '../shared/logger';
-import { serveStatic, trim } from './socketServer/assets';
-import { loadSSL } from './socketServer/ssl';
+import type { SSL, SSLBuffer, Server } from '../shared/interfaces.js';
+import { favicon, redirect } from './socketServer/middleware.js';
+import { html } from './socketServer/html.js';
+import { listen } from './socketServer/socket.js';
+import { logger } from '../shared/logger.js';
+import { serveStatic, trim } from './socketServer/assets.js';
+import { loadSSL } from './socketServer/ssl.js';
 
 export async function server(
   { base, port, host, title, bypassHelmet }: Server,
diff --git a/src/server/socketServer/html.ts b/src/server/socketServer/html.ts
index feb9c8c..47785ed 100644
--- a/src/server/socketServer/html.ts
+++ b/src/server/socketServer/html.ts
@@ -1,5 +1,5 @@
 import type express from 'express';
-import { isDev } from '../../shared/env';
+import { isDev } from '../../shared/env.js';
 
 const jsFiles = isDev ? ['dev', 'wetty'] : ['wetty'];
 const cssFiles = ['styles', 'options', 'overlay', 'terminal'];
diff --git a/src/server/socketServer/socket.ts b/src/server/socketServer/socket.ts
index d35fa94..2798130 100644
--- a/src/server/socketServer/socket.ts
+++ b/src/server/socketServer/socket.ts
@@ -4,8 +4,8 @@ import http from 'http';
 import https from 'https';
 import isUndefined from 'lodash/isUndefined.js';
 
-import { logger } from '../../shared/logger';
-import type { SSLBuffer } from '../../shared/interfaces';
+import { logger } from '../../shared/logger.js';
+import type { SSLBuffer } from '../../shared/interfaces.js';
 
 export const listen = (
   app: express.Express,
diff --git a/src/server/socketServer/ssl.ts b/src/server/socketServer/ssl.ts
index ad132fb..690dd7d 100644
--- a/src/server/socketServer/ssl.ts
+++ b/src/server/socketServer/ssl.ts
@@ -1,7 +1,7 @@
 import fs from 'fs-extra';
 import path from 'path';
 import isUndefined from 'lodash/isUndefined.js';
-import type { SSL, SSLBuffer } from '../shared/interfaces';
+import type { SSL, SSLBuffer } from '../../shared/interfaces';
 
 export async function loadSSL(ssl?: SSL): Promise<SSLBuffer> {
   if (isUndefined(ssl) || isUndefined(ssl.key) || isUndefined(ssl.cert))
diff --git a/src/server/spawn.ts b/src/server/spawn.ts
index a7c1566..1a1896f 100644
--- a/src/server/spawn.ts
+++ b/src/server/spawn.ts
@@ -1,7 +1,7 @@
 import isUndefined from 'lodash/isUndefined.js';
 import pty from 'node-pty';
-import { logger } from '../shared/logger';
-import { xterm } from './shared/xterm';
+import { logger } from '../shared/logger.js';
+import { xterm } from './shared/xterm.js';
 
 export function spawn(socket: SocketIO.Socket, args: string[]): void {
   const term = pty.spawn('/usr/bin/env', args, xterm);
diff --git a/src/shared/config.ts b/src/shared/config.ts
new file mode 100644
index 0000000..0db8daf
--- /dev/null
+++ b/src/shared/config.ts
@@ -0,0 +1,126 @@
+import fs from 'fs-extra';
+import path from 'path';
+import JSON5 from 'json5';
+import isUndefined from 'lodash/isUndefined.js';
+
+import type { Config, SSH, Server } from './interfaces';
+import {
+  sshDefault,
+  serverDefault,
+  forceSSHDefault,
+  defaultCommand,
+} from './defaults.js';
+
+/**
+ * Cast given value to boolean
+ *
+ * @param value - variable to cast
+ * @returns variable cast to boolean
+ */
+function ensureBoolean(value: any): boolean {
+  switch (value) {
+    case true:
+    case 'true':
+    case 1:
+    case '1':
+    case 'on':
+    case 'yes':
+      return true;
+    default:
+      return false;
+  }
+}
+
+/**
+ * Load JSON5 config from file and merge with default args
+ * If no path is provided the default config is returned
+ *
+ * @param filepath - path to config to load
+ * @returns variable cast to boolean
+ */
+export async function loadConfigFile(filepath?: string): Promise<Config> {
+  if (isUndefined(filepath)) {
+    return {
+      ssh: sshDefault,
+      server: serverDefault,
+      command: defaultCommand,
+      forceSSH: forceSSHDefault,
+    };
+  }
+  const content = await fs.readFile(path.resolve(filepath));
+  const parsed = JSON5.parse(content.toString()) as Config;
+  return {
+    ssh: isUndefined(parsed.ssh)
+      ? sshDefault
+      : Object.assign(sshDefault, parsed.ssh),
+    server: isUndefined(parsed.server)
+      ? serverDefault
+      : Object.assign(serverDefault, parsed.server),
+    command: isUndefined(parsed.command) ? defaultCommand : `${parsed.command}`,
+    forceSSH: isUndefined(parsed.forceSSH)
+      ? forceSSHDefault
+      : ensureBoolean(parsed.forceSSH),
+    ssl: parsed.ssl,
+  };
+}
+
+/**
+ * Merge 2 objects removing undefined fields
+ *
+ * @param target - base object
+ * @param source - object to get new values from
+ * @returns merged object
+ *
+ */
+const objectAssign = (
+  target: Record<string, any>,
+  source: Record<string, any>,
+): Record<string, any> =>
+  Object.fromEntries(
+    Object.entries(source).map(([key, value]) => [
+      key,
+      isUndefined(source[key]) ? target[key] : value,
+    ]),
+  );
+
+/**
+ * Merge cli arguemens with config object
+ *
+ * @param opts - Object containing cli args
+ * @param config - Config object
+ * @returns merged configuration
+ *
+ */
+export function mergeCliConf(
+  opts: Record<string, any>,
+  config: Config,
+): Config {
+  const ssl = {
+    key: opts['ssl-key'],
+    cert: opts['ssl-cert'],
+    ...config.ssl,
+  };
+  return {
+    ssh: objectAssign(config.ssh, {
+      user: opts['ssh-user'],
+      host: opts['ssh-host'],
+      auth: opts['ssh-auth'],
+      port: opts['ssh-port'],
+      pass: opts['ssh-pass'],
+      key: opts['ssh-key'],
+      knownHosts: opts['known-hosts'],
+    }) as SSH,
+    server: objectAssign(config.server, {
+      base: opts.base,
+      host: opts.host,
+      port: opts.port,
+      title: opts.title,
+      bypassHelmet: opts['bypass-helmet'],
+    }) as Server,
+    command: isUndefined(opts.command) ? config.command : opts.command,
+    forceSSH: isUndefined(opts['force-ssh'])
+      ? config.forceSSH
+      : opts['force-ssh'],
+    ssl: isUndefined(ssl.key) || isUndefined(ssl.cert) ? undefined : ssl,
+  };
+}
diff --git a/src/shared/defaults.ts b/src/shared/defaults.ts
index 4646b79..7af776b 100644
--- a/src/shared/defaults.ts
+++ b/src/shared/defaults.ts
@@ -1,4 +1,4 @@
-import type { SSH, Server } from '../shared/interfaces';
+import type { SSH, Server } from "./interfaces";
 
 export const sshDefault: SSH = {
   user: process.env.SSHUSER || '',
diff --git a/src/shared/interfaces.ts b/src/shared/interfaces.ts
index 5ccabed..3cee8cc 100644
--- a/src/shared/interfaces.ts
+++ b/src/shared/interfaces.ts
@@ -25,3 +25,11 @@ export interface Server {
   base: string;
   bypassHelmet: boolean;
 }
+
+export interface Config {
+  ssh: SSH;
+  server: Server;
+  forceSSH: boolean;
+  command: string;
+  ssl?: SSL;
+}
diff --git a/src/shared/logger.ts b/src/shared/logger.ts
index c33b56c..6cf2c62 100644
--- a/src/shared/logger.ts
+++ b/src/shared/logger.ts
@@ -1,6 +1,6 @@
 import winston from 'winston';
 
-import { isDev } from './env';
+import { isDev } from './env.js';
 
 const { combine, timestamp, label, simple, json, colorize } = winston.format;
 
diff --git a/tsconfig.json b/tsconfig.json
index fb9a761..12cadb1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -19,7 +19,35 @@
     "removeComments": true,
     "skipLibCheck": true,
     "sourceMap": true,
-    "strict": true
+    "strict": true,
+    "baseUrl": ".",
+    "paths": {
+      "/*/web_modules/lodash.js": [
+        "node_modules/@types/lodash/index.d.ts"
+      ],
+      "/*/web_modules/xterm.js": [
+        "node_modules/xterm/typings/xterm.d.ts",
+        "node_modules/xterm"
+      ],
+      "/*/web_modules/xterm-addon-fit.js": [
+        "node_modules/xterm-addon-fit"
+      ],
+      "/*/web_modules/toastify-js.js": [
+        "node_modules/toastify-js"
+      ],
+      "/*/web_modules/file-type.js": [
+        "node_modules/file-type"
+      ],
+      "/*/web_modules/socket.io-client.js": [
+        "node_modules/@types/socket.io-client/index.d.ts"
+      ],
+      "/*/web_modules/@fortawesome/fontawesome-svg-core.js": [
+        "node_modules/@fortawesome/fontawesome-svg-core"
+      ],
+      "/*/web_modules/@fortawesome/free-solid-svg-icons.js": [
+        "node_modules/@fortawesome/free-solid-svg-icons"
+      ]
+    }
   },
   "include": [
     "src"