diff --git a/dist/index.d.ts b/dist/index.d.ts
index 70b7737..a101a14 100644
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@@ -4,46 +4,22 @@
  * https://github.com/bcoin-org/bcoin
  */
 /// <reference types="node" />
-export interface Options {
-    suffix?: string;
-    fallback?: string;
-    alias?: object;
-}
-export interface LoadOptions {
-    hash?: string | boolean;
-    query?: string | boolean;
-    env?: object | boolean;
-    argv?: string[] | boolean;
-    config?: string | boolean;
-}
+import arg from "arg";
 /**
  * Config Parser
  */
 export default class Config {
     private module;
-    private prefix;
-    private suffix?;
-    private fallback?;
-    private options;
-    private alias;
     private data;
-    private env;
-    private args;
-    private argv;
-    private pass;
-    private query;
-    private hash;
-    constructor(module: string, options?: Options);
-    private init;
+    constructor(module: string);
     inject(options: object): void;
-    load(options: LoadOptions): void;
-    open(file: string): void;
+    load(): void;
     openDir(dir: string): void;
-    openJson(file: string): void;
-    saveConfigJson(file: string, data: object): void;
-    filter(name: string): Config;
+    open(file: string): void;
+    save(file: string, data: object): void;
     set(key: string, value: any): void;
-    has(key: string): boolean;
+    has(key: string): any;
+    private normalize;
     get(key: string, fallback?: any): any;
     typeOf(key: string): "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function" | "null";
     str(key: string, fallback?: any): any;
@@ -58,16 +34,7 @@ export default class Config {
     array(key: string, fallback?: any): any;
     obj(key: string, fallback?: any): any;
     func(key: string, fallback?: any): any;
-    path(key: string, fallback?: any): any;
     mb(key: string, fallback?: any): any;
-    getSuffix(): any;
-    getPrefix(): string;
-    getFile(file: string): any;
-    location(file: string): string;
-    parseConfig(text: string): void;
-    parseArg(argv?: string[]): void;
+    parseArg(args: arg.Result<any>): void;
     parseEnv(env?: object): void;
-    parseQuery(query: string): void | {};
-    parseHash(hash: string): void | {};
-    parseForm(query: string, ch: string, map: object): void;
 }
diff --git a/dist/index.js b/dist/index.js
index b0f33db..6abb613 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -10,60 +10,25 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
 Object.defineProperty(exports, "__esModule", { value: true });
 const bsert_1 = __importDefault(require("bsert"));
 const path_1 = __importDefault(require("path"));
-const os_1 = __importDefault(require("os"));
 const fs_1 = __importDefault(require("fs"));
-const HOME = os_1.default.homedir ? os_1.default.homedir() : "/";
+const arg_1 = __importDefault(require("arg"));
+const object_path_1 = __importDefault(require("object-path"));
+const deep_to_flat_object_1 = __importDefault(require("deep-to-flat-object"));
 /**
  * Config Parser
  */
 class Config {
     module;
-    prefix;
-    suffix;
-    fallback;
-    options = {};
-    alias = {};
     data = {};
-    env = {};
-    args = {};
-    argv = [];
-    pass = [];
-    query = {};
-    hash = {};
-    constructor(module, options) {
+    constructor(module) {
         (0, bsert_1.default)(typeof module === "string");
         (0, bsert_1.default)(module.length > 0);
         this.module = module;
-        this.prefix = path_1.default.join(HOME, `.${module}`);
-        if (options) {
-            this.init(options);
-        }
-    }
-    init(options) {
-        (0, bsert_1.default)(options && typeof options === "object");
-        if (options.suffix != null) {
-            (0, bsert_1.default)(typeof options.suffix === "string");
-            this.suffix = options.suffix;
-        }
-        if (options.fallback != null) {
-            (0, bsert_1.default)(typeof options.fallback === "string");
-            this.fallback = options.fallback;
-        }
-        if (options.alias) {
-            (0, bsert_1.default)(typeof options.alias === "object");
-            for (const key of Object.keys(options.alias)) {
-                const value = options.alias[key];
-                (0, bsert_1.default)(typeof value === "string");
-                this.alias[key] = value;
-            }
-        }
     }
     inject(options) {
         for (const key of Object.keys(options)) {
             const value = options[key];
             switch (key) {
-                case "hash":
-                case "query":
                 case "env":
                 case "argv":
                 case "config":
@@ -72,41 +37,19 @@ class Config {
             this.set(key, value);
         }
     }
-    load(options) {
-        if (options.hash) {
-            this.parseHash(options.hash);
-        }
-        if (options.query) {
-            this.parseQuery(options.query);
-        }
-        if (options.env) {
-            this.parseEnv(options.env);
-        }
-        if (options.argv) {
-            this.parseArg(options.argv);
-        }
-        this.prefix = this.getPrefix();
-    }
-    open(file) {
-        const path = this.getFile(file);
-        let text;
-        try {
-            text = fs_1.default.readFileSync(path, "utf8");
-        }
-        catch (e) {
-            if (e.code === "ENOENT")
-                return;
-            throw e;
-        }
-        this.parseConfig(text);
-        this.prefix = this.getPrefix();
+    load() {
+        const args = (0, arg_1.default)({}, { permissive: true });
+        this.parseArg(args);
     }
     openDir(dir) {
         (0, bsert_1.default)(fs_1.default.existsSync(dir), `Directory ${dir} does not exist`);
-        let files = fs_1.default.readdirSync(dir).map((item) => path_1.default.join(dir, item));
-        files.forEach(this.openJson.bind(this));
+        let files = fs_1.default
+            .readdirSync(dir)
+            .filter((item) => item.endsWith(".json"))
+            .map((item) => path_1.default.join(dir, item));
+        files.forEach(this.open.bind(this));
     }
-    openJson(file) {
+    open(file) {
         let json;
         try {
             json = fs_1.default.readFileSync(file, "utf8");
@@ -118,20 +61,22 @@ class Config {
             throw new Error(`Error parsing file ${file}: ${e.message}`);
         }
         (0, bsert_1.default)(typeof json === "object", `Config file ${file} must be an object`);
-        for (const key of Object.keys(json)) {
+        const settings = (0, deep_to_flat_object_1.default)(json);
+        for (const key of Object.keys(settings)) {
             const value = json[key];
-            switch (true) {
-                case Array.isArray(value):
-                    this.set(key, [...(this.array(key) ?? []), ...value]);
-                    break;
-                default:
-                    this.set(key, value);
-                    break;
+            let keyPath = key.split(".");
+            let isArray = typeof parseInt(keyPath.pop()) === "number";
+            if (isArray) {
+                let itemPath = keyPath.join(".");
+                let item = this.get(itemPath, []);
+                item.push(value);
+                this.set(itemPath, item);
+                continue;
             }
+            this.set(key, value);
         }
-        this.prefix = this.getPrefix();
     }
-    saveConfigJson(file, data) {
+    save(file, data) {
         (0, bsert_1.default)(typeof data === "object");
         (0, bsert_1.default)(!Array.isArray(data));
         const configDir = this.str("configdir");
@@ -140,56 +85,34 @@ class Config {
             fs_1.default.mkdirSync(configDir, { recursive: true });
         }
         fs_1.default.writeFileSync(fullPath, JSON.stringify(data));
-        this.openJson(fullPath);
-    }
-    filter(name) {
-        (0, bsert_1.default)(typeof name === "string");
-        const child = new Config(this.module);
-        child.prefix = this.prefix;
-        child.suffix = this.suffix;
-        child.fallback = this.fallback;
-        child.argv = this.argv;
-        child.pass = this.pass;
-        _filter(name, this.env, child.env);
-        _filter(name, this.args, child.args);
-        _filter(name, this.query, child.query);
-        _filter(name, this.hash, child.hash);
-        _filter(name, this.options, child.options);
-        return child;
+        this.open(fullPath);
     }
     set(key, value) {
         (0, bsert_1.default)(typeof key === "string", "Key must be a string.");
         if (value == null) {
             return;
         }
-        key = key.replace(/-/g, "");
-        key = key.toLowerCase();
-        this.options[key] = value;
+        key = this.normalize(key);
+        object_path_1.default.set(this.data, key, value);
+        this.data[key] = value;
     }
     has(key) {
-        if (typeof key === "number") {
-            (0, bsert_1.default)(key >= 0, "Index must be positive.");
-            return key < this.argv.length;
-        }
         (0, bsert_1.default)(typeof key === "string", "Key must be a string.");
         key = key.replace(/-/g, "");
         key = key.toLowerCase();
-        if (key in this.hash && this.hash[key] !== null) {
-            return true;
+        return object_path_1.default.has(this.data, key);
+    }
+    normalize(key, env = false) {
+        (0, bsert_1.default)(typeof key === "string", "Key must be a string.");
+        if (env) {
+            key = key.replace(/__/g, ".");
+            key = key.replace(/_/g, "");
         }
-        if (key in this.query && this.query[key] !== null) {
-            return true;
+        else {
+            key = key.replace(/-/g, "");
         }
-        if (key in this.args && this.args[key] !== null) {
-            return true;
-        }
-        if (key in this.env && this.env[key] !== null) {
-            return true;
-        }
-        if (key in this.data && this.data[key] !== null) {
-            return true;
-        }
-        return this.options[key] !== null;
+        key = key.toLowerCase();
+        return key;
     }
     get(key, fallback = null) {
         if (Array.isArray(key)) {
@@ -202,38 +125,9 @@ class Config {
             }
             return fallback;
         }
-        if (typeof key === "number") {
-            (0, bsert_1.default)(key >= 0, "Index must be positive.");
-            if (key >= this.argv.length) {
-                return fallback;
-            }
-            if (this.argv[key] != null) {
-                return this.argv[key];
-            }
-            return fallback;
-        }
         (0, bsert_1.default)(typeof key === "string", "Key must be a string.");
-        key = key.replace(/-/g, "");
-        key = key.toLowerCase();
-        if (key in this.hash && this.hash[key] !== null) {
-            return this.hash[key];
-        }
-        if (key in this.query && this.query[key] !== null) {
-            return this.query[key];
-        }
-        if (key in this.args && this.args[key] !== null) {
-            return this.args[key];
-        }
-        if (key in this.env && this.env[key] !== null) {
-            return this.env[key];
-        }
-        if (key in this.data && this.data[key] !== null) {
-            return this.data[key];
-        }
-        if (key in this.options && this.options[key] !== null) {
-            return this.options[key];
-        }
-        return fallback;
+        key = this.normalize(key);
+        return object_path_1.default.get(this.data, key);
     }
     typeOf(key) {
         const value = this.get(key);
@@ -429,26 +323,6 @@ class Config {
         }
         return value;
     }
-    path(key, fallback = null) {
-        let value = this.str(key);
-        if (value === null) {
-            return fallback;
-        }
-        if (value.length === 0) {
-            return fallback;
-        }
-        switch (value[0]) {
-            case "~": // home dir
-                value = path_1.default.join(HOME, value.substring(1));
-                break;
-            case "@": // prefix
-                value = path_1.default.join(this.prefix, value.substring(1));
-                break;
-            default: // cwd
-                break;
-        }
-        return path_1.default.normalize(value);
-    }
     mb(key, fallback = null) {
         const value = this.uint(key);
         if (value === null) {
@@ -456,176 +330,10 @@ class Config {
         }
         return value * 1024 * 1024;
     }
-    getSuffix() {
-        if (!this.suffix) {
-            throw new Error("No suffix presented.");
-        }
-        const suffix = this.str(this.suffix, this.fallback);
-        (0, bsert_1.default)(isAlpha(suffix), "Bad suffix.");
-        return suffix;
-    }
-    getPrefix() {
-        let prefix = this.str("prefix");
-        if (prefix) {
-            if (prefix[0] === "~") {
-                prefix = path_1.default.join(HOME, prefix.substring(1));
-            }
-        }
-        else {
-            prefix = path_1.default.join(HOME, `.${this.module}`);
-        }
-        if (this.suffix) {
-            const suffix = this.str(this.suffix);
-            if (suffix) {
-                (0, bsert_1.default)(isAlpha(suffix), "Bad suffix.");
-                if (this.fallback && suffix !== this.fallback) {
-                    prefix = path_1.default.join(prefix, suffix);
-                }
-            }
-        }
-        return path_1.default.normalize(prefix);
-    }
-    getFile(file) {
-        const name = this.str("config");
-        if (name) {
-            return name;
-        }
-        return path_1.default.join(this.prefix, file);
-    }
-    location(file) {
-        return path_1.default.join(this.prefix, file);
-    }
-    parseConfig(text) {
-        (0, bsert_1.default)(typeof text === "string", "Config must be text.");
-        if (text.charCodeAt(0) === 0xfeff) {
-            text = text.substring(1);
-        }
-        text = text.replace(/\r\n/g, "\n");
-        text = text.replace(/\r/g, "\n");
-        text = text.replace(/\\\n/g, "");
-        let num = 0;
-        for (const chunk of text.split("\n")) {
-            const line = chunk.trim();
-            num += 1;
-            if (line.length === 0) {
-                continue;
-            }
-            if (line[0] === "#") {
-                continue;
-            }
-            const index = line.indexOf(":");
-            if (index === -1) {
-                throw new Error(`Expected ':' on line ${num}: "${line}".`);
-            }
-            let key = line.substring(0, index).trim();
-            key = key.replace(/\-/g, "");
-            if (!isLowerKey(key)) {
-                throw new Error(`Invalid option on line ${num}: ${key}.`);
-            }
-            const value = line.substring(index + 1).trim();
-            if (value.length === 0) {
-                continue;
-            }
-            const alias = this.alias[key];
-            if (alias) {
-                key = alias;
-            }
-            this.data[key] = value;
-        }
-    }
-    parseArg(argv) {
-        if (!argv || typeof argv !== "object")
-            argv = process.argv;
-        (0, bsert_1.default)(Array.isArray(argv));
-        let last = null;
-        let pass = false;
-        for (let i = 2; i < argv.length; i++) {
-            const arg = argv[i];
-            (0, bsert_1.default)(typeof arg === "string");
-            if (arg === "--") {
-                pass = true;
-                continue;
-            }
-            if (pass) {
-                this.pass.push(arg);
-                continue;
-            }
-            if (arg.length === 0) {
-                last = null;
-                continue;
-            }
-            if (arg.indexOf("--") === 0) {
-                const index = arg.indexOf("=");
-                let key = null;
-                let value = null;
-                let empty = false;
-                if (index !== -1) {
-                    // e.g. --opt=val
-                    key = arg.substring(2, index);
-                    value = arg.substring(index + 1);
-                    last = null;
-                    empty = false;
-                }
-                else {
-                    // e.g. --opt
-                    key = arg.substring(2);
-                    value = "true";
-                    last = null;
-                    empty = true;
-                }
-                key = key.replace(/\-/g, "");
-                if (!isLowerKey(key)) {
-                    throw new Error(`Invalid argument: --${key}.`);
-                }
-                if (value.length === 0) {
-                    continue;
-                }
-                // Do not allow one-letter aliases.
-                if (key.length > 1) {
-                    const alias = this.alias[key];
-                    if (alias) {
-                        key = alias;
-                    }
-                }
-                this.args[key] = value;
-                if (empty) {
-                    last = key;
-                }
-                continue;
-            }
-            if (arg[0] === "-") {
-                // e.g. -abc
-                last = null;
-                for (let j = 1; j < arg.length; j++) {
-                    let key = arg[j];
-                    if ((key < "a" || key > "z") &&
-                        (key < "A" || key > "Z") &&
-                        (key < "0" || key > "9") &&
-                        key !== "?") {
-                        throw new Error(`Invalid argument: -${key}.`);
-                    }
-                    const alias = this.alias[key];
-                    if (alias) {
-                        key = alias;
-                    }
-                    this.args[key] = "true";
-                    last = key;
-                }
-                continue;
-            }
-            // e.g. foo
-            const value = arg;
-            if (value.length === 0) {
-                last = null;
-                continue;
-            }
-            if (last) {
-                this.args[last] = value;
-                last = null;
-            }
-            else {
-                this.argv.push(value);
-            }
+    parseArg(args) {
+        for (let key in args) {
+            let newKey = key.replace("-", "");
+            object_path_1.default.set(this.data, newKey, args[key]);
         }
     }
     parseEnv(env) {
@@ -640,84 +348,18 @@ class Config {
         for (let key of Object.keys(env)) {
             const value = env[key];
             (0, bsert_1.default)(typeof value === "string");
-            if (key.indexOf(prefix) !== 0)
+            if (key.indexOf(prefix) !== 0) {
                 continue;
-            key = key.substring(prefix.length);
-            key = key.replace(/_/g, "");
+            }
             if (!isUpperKey(key)) {
                 continue;
             }
+            key = key.substring(prefix.length);
+            key = this.normalize(key, true);
             if (value.length === 0) {
                 continue;
             }
-            key = key.toLowerCase();
-            // Do not allow one-letter aliases.
-            if (key.length > 1) {
-                const alias = this.alias[key];
-                if (alias) {
-                    key = alias;
-                }
-            }
-            this.env[key] = value;
-        }
-    }
-    parseQuery(query) {
-        if (typeof query !== "string") {
-            if (!global.location) {
-                return {};
-            }
-            query = global.location.search;
-            if (typeof query !== "string") {
-                return {};
-            }
-        }
-        return this.parseForm(query, "?", this.query);
-    }
-    parseHash(hash) {
-        if (typeof hash !== "string") {
-            if (!global.location) {
-                return {};
-            }
-            hash = global.location.hash;
-            if (typeof hash !== "string") {
-                return {};
-            }
-        }
-        return this.parseForm(hash, "#", this.hash);
-    }
-    parseForm(query, ch, map) {
-        (0, bsert_1.default)(typeof query === "string");
-        if (query.length === 0) {
-            return;
-        }
-        if (query[0] === ch) {
-            query = query.substring(1);
-        }
-        for (const pair of query.split("&")) {
-            const index = pair.indexOf("=");
-            let key, value;
-            if (index !== -1) {
-                key = pair.substring(0, index);
-                value = pair.substring(index + 1);
-            }
-            else {
-                key = pair;
-                value = "true";
-            }
-            key = unescape(key);
-            key = key.replace(/\-/g, "");
-            if (!isLowerKey(key)) {
-                continue;
-            }
-            value = unescape(value);
-            if (value.length === 0) {
-                continue;
-            }
-            const alias = this.alias[key];
-            if (alias) {
-                key = alias;
-            }
-            map[key] = value;
+            object_path_1.default.set(this.data, key);
         }
     }
 }
@@ -734,41 +376,18 @@ function fmt(key) {
     }
     return key;
 }
-function unescape(str) {
-    try {
-        str = decodeURIComponent(str);
-        str = str.replace(/\+/g, " ");
-    }
-    catch (e) { }
-    str = str.replace(/\0/g, "");
-    return str;
-}
 function isAlpha(str) {
     return /^[a-z0-9_\-]+$/i.test(str);
 }
 function isKey(key) {
     return /^[a-zA-Z0-9]+$/.test(key);
 }
-function isLowerKey(key) {
-    if (!isKey(key)) {
-        return false;
-    }
-    return !/[A-Z]/.test(key);
-}
 function isUpperKey(key) {
     if (!isKey(key)) {
         return false;
     }
     return !/[a-z]/.test(key);
 }
-function _filter(name, a, b) {
-    for (const key of Object.keys(a)) {
-        if (key.length > name.length && key.indexOf(name) === 0) {
-            const sub = key.substring(name.length);
-            b[sub] = a[key];
-        }
-    }
-}
 function fromFloat(num, exp) {
     (0, bsert_1.default)(typeof num === "number" && isFinite(num));
     (0, bsert_1.default)(Number.isSafeInteger(exp));