diff --git a/Cargo.lock b/Cargo.lock
index 3b7e70c186..09c4946e17 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -209,6 +209,7 @@ dependencies = [
  "sea-orm",
  "serde",
  "serde_json",
+ "serde_yaml",
  "thiserror",
  "tokio",
 ]
@@ -2157,6 +2158,19 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_yaml"
+version = "0.9.34+deprecated"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a8b1a1a2ebf674015cc02edccce75287f1a0130d394307b36743c2f5d504b47"
+dependencies = [
+ "indexmap",
+ "itoa",
+ "ryu",
+ "serde",
+ "unsafe-libyaml",
+]
+
 [[package]]
 name = "sha1"
 version = "0.10.6"
@@ -2849,6 +2863,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39ec24b3121d976906ece63c9daad25b85969647682eee313cb5779fdd69e14e"
 
+[[package]]
+name = "unsafe-libyaml"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
+
 [[package]]
 name = "untrusted"
 version = "0.9.0"
diff --git a/Cargo.toml b/Cargo.toml
index 993fa06924..fcb5be2f0b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,6 +27,7 @@ schemars = "0.8.16"
 sea-orm = "0.12.15"
 serde = "1.0.197"
 serde_json = "1.0.115"
+serde_yaml = "0.9.34"
 syn = "2.0.58"
 thiserror = "1.0.58"
 tokio = "1.37.0"
diff --git a/packages/backend-rs/Cargo.toml b/packages/backend-rs/Cargo.toml
index 48bdebc470..1429548a67 100644
--- a/packages/backend-rs/Cargo.toml
+++ b/packages/backend-rs/Cargo.toml
@@ -31,6 +31,7 @@ schemars = { workspace = true, features = ["chrono"] }
 sea-orm = { workspace = true, features = ["sqlx-postgres", "runtime-tokio-rustls"] }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
+serde_yaml = { workspace = true }
 thiserror = { workspace = true }
 tokio = { workspace = true, features = ["full"] }
 
diff --git a/packages/backend-rs/index.d.ts b/packages/backend-rs/index.d.ts
index 44c8aa6660..3168aa7105 100644
--- a/packages/backend-rs/index.d.ts
+++ b/packages/backend-rs/index.d.ts
@@ -3,6 +3,115 @@
 
 /* auto-generated by NAPI-RS */
 
+export interface ServerConfig {
+  url: string
+  port: number
+  /** host to listen on */
+  bind?: string
+  disableHsts?: boolean
+  db: DbConfig
+  redis: RedisConfig
+  cacheServer?: RedisConfig
+  proxy?: string
+  proxySmtp?: string
+  proxyBypassHosts?: Array<string>
+  allowedPrivateNetworks?: Array<string>
+  /** `NapiValue` is not implemented for `u64` */
+  maxFileSize?: number
+  accessLog?: string
+  clusterLimits?: WorkerConfig
+  cuid?: IdConfig
+  outgoingAddress?: string
+  deliverJobConcurrency?: number
+  inboxJobConcurrency?: number
+  deliverJobPerSec?: number
+  inboxJobPerSec?: number
+  deliverJobMaxAttempts?: number
+  inboxJobMaxAttempts?: number
+  logLevel?: Array<string>
+  syslog?: SysLogConfig
+  proxyRemoteFiles?: boolean
+  mediaProxy?: string
+  summalyProxyUrl?: string
+  reservedUsernames?: Array<string>
+  maxUserSignups?: number
+  isManagedHosting?: boolean
+  maxNoteLength?: number
+  maxCaptionLength?: number
+  deepl?: DeepLConfig
+  libreTranslate?: LibreTranslateConfig
+  email?: EmailConfig
+  objectStorage?: ObjectStorageConfig
+}
+export interface DbConfig {
+  host: string
+  port: number
+  db: string
+  user: string
+  pass: string
+  disableCache?: boolean
+  extra?: any
+}
+export interface RedisConfig {
+  host: string
+  port: number
+  family?: number
+  user?: string
+  pass?: string
+  tls?: TlsConfig
+  db: number
+  prefix: string
+}
+export interface TlsConfig {
+  host: string
+  rejectUnauthorized: boolean
+}
+export interface WorkerConfig {
+  web?: number
+  queue?: number
+}
+export interface IdConfig {
+  length?: number
+  fingerprint?: string
+}
+export interface SysLogConfig {
+  host: string
+  port: number
+}
+export interface DeepLConfig {
+  managed?: boolean
+  authKey?: string
+  isPro?: boolean
+}
+export interface LibreTranslateConfig {
+  managed?: boolean
+  apiUrl?: string
+  apiKey?: string
+}
+export interface EmailConfig {
+  managed?: boolean
+  address?: string
+  host?: string
+  port?: number
+  user?: string
+  pass?: string
+  useImplicitSslTls?: boolean
+}
+export interface ObjectStorageConfig {
+  managed?: boolean
+  baseUrl?: string
+  bucket?: string
+  prefix?: string
+  endpoint?: string
+  region?: string
+  accessKey?: string
+  secretKey?: string
+  useSsl?: boolean
+  connnectOverProxy?: boolean
+  setPublicReadOnUpload?: boolean
+  s3ForcePathStyle?: boolean
+}
+export function readServerConfig(): ServerConfig
 export interface Acct {
   username: string
   host: string | null
diff --git a/packages/backend-rs/index.js b/packages/backend-rs/index.js
index d3a197e5f0..800baabeb2 100644
--- a/packages/backend-rs/index.js
+++ b/packages/backend-rs/index.js
@@ -310,8 +310,9 @@ if (!nativeBinding) {
   throw new Error(`Failed to load native binding`)
 }
 
-const { stringToAcct, acctToString, nyaify, AntennaSrcEnum, MutedNoteReasonEnum, NoteVisibilityEnum, NotificationTypeEnum, PageVisibilityEnum, PollNotevisibilityEnum, RelayStatusEnum, UserEmojimodpermEnum, UserProfileFfvisibilityEnum, UserProfileMutingnotificationtypesEnum, initIdGenerator, getTimestamp, genId, secureRndstr, IdConvertType, convertId } = nativeBinding
+const { readServerConfig, stringToAcct, acctToString, nyaify, AntennaSrcEnum, MutedNoteReasonEnum, NoteVisibilityEnum, NotificationTypeEnum, PageVisibilityEnum, PollNotevisibilityEnum, RelayStatusEnum, UserEmojimodpermEnum, UserProfileFfvisibilityEnum, UserProfileMutingnotificationtypesEnum, initIdGenerator, getTimestamp, genId, secureRndstr, IdConvertType, convertId } = nativeBinding
 
+module.exports.readServerConfig = readServerConfig
 module.exports.stringToAcct = stringToAcct
 module.exports.acctToString = acctToString
 module.exports.nyaify = nyaify
diff --git a/packages/backend-rs/src/config/mod.rs b/packages/backend-rs/src/config/mod.rs
new file mode 100644
index 0000000000..74f47ad347
--- /dev/null
+++ b/packages/backend-rs/src/config/mod.rs
@@ -0,0 +1 @@
+pub mod server;
diff --git a/packages/backend-rs/src/config/server.rs b/packages/backend-rs/src/config/server.rs
new file mode 100644
index 0000000000..200b97dc4c
--- /dev/null
+++ b/packages/backend-rs/src/config/server.rs
@@ -0,0 +1,176 @@
+use once_cell::sync::Lazy;
+use serde::Deserialize;
+use std::env;
+use std::fs;
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct ServerConfig {
+    pub url: String,
+    pub port: u16,
+    /// host to listen on
+    pub bind: Option<String>,
+    pub disable_hsts: Option<bool>,
+
+    pub db: DbConfig,
+    pub redis: RedisConfig,
+    pub cache_server: Option<RedisConfig>,
+
+    pub proxy: Option<String>,
+    pub proxy_smtp: Option<String>,
+    pub proxy_bypass_hosts: Option<Vec<String>>,
+
+    pub allowed_private_networks: Option<Vec<String>>,
+    /// `NapiValue` is not implemented for `u64`
+    pub max_file_size: Option<i64>,
+    pub access_log: Option<String>,
+    pub cluster_limits: Option<WorkerConfig>,
+    pub cuid: Option<IdConfig>,
+    pub outgoing_address: Option<String>,
+
+    pub deliver_job_concurrency: Option<u32>,
+    pub inbox_job_concurrency: Option<u32>,
+    pub deliver_job_per_sec: Option<u32>,
+    pub inbox_job_per_sec: Option<u32>,
+    pub deliver_job_max_attempts: Option<u32>,
+    pub inbox_job_max_attempts: Option<u32>,
+
+    pub log_level: Option<Vec<String>>,
+
+    pub syslog: Option<SysLogConfig>,
+
+    pub proxy_remote_files: Option<bool>,
+    pub media_proxy: Option<String>,
+    pub summaly_proxy_url: Option<String>,
+
+    pub reserved_usernames: Option<Vec<String>>,
+
+    pub max_user_signups: Option<u32>,
+    pub is_managed_hosting: Option<bool>,
+    pub max_note_length: Option<u32>,
+    pub max_caption_length: Option<u32>,
+
+    pub deepl: Option<DeepLConfig>,
+    pub libre_translate: Option<LibreTranslateConfig>,
+    pub email: Option<EmailConfig>,
+    pub object_storage: Option<ObjectStorageConfig>,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[crate::export(object, use_nullable = false)]
+pub struct DbConfig {
+    pub host: String,
+    pub port: u16,
+    pub db: String,
+    pub user: String,
+    pub pass: String,
+    pub disable_cache: Option<bool>,
+    pub extra: Option<serde_json::Value>,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[crate::export(object, use_nullable = false)]
+pub struct RedisConfig {
+    pub host: String,
+    pub port: u16,
+    pub family: Option<u8>,
+    pub user: Option<String>,
+    pub pass: Option<String>,
+    pub tls: Option<TlsConfig>,
+    #[serde(default)]
+    pub db: u32,
+    #[serde(default)]
+    pub prefix: String,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct TlsConfig {
+    pub host: String,
+    pub reject_unauthorized: bool,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct WorkerConfig {
+    pub web: Option<u32>,
+    pub queue: Option<u32>,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct IdConfig {
+    pub length: Option<u8>,
+    pub fingerprint: Option<String>,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct SysLogConfig {
+    pub host: String,
+    pub port: u16,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct DeepLConfig {
+    pub managed: Option<bool>,
+    pub auth_key: Option<String>,
+    pub is_pro: Option<bool>,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct LibreTranslateConfig {
+    pub managed: Option<bool>,
+    pub api_url: Option<String>,
+    pub api_key: Option<String>,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct EmailConfig {
+    pub managed: Option<bool>,
+    pub address: Option<String>,
+    pub host: Option<String>,
+    pub port: Option<u16>,
+    pub user: Option<String>,
+    pub pass: Option<String>,
+    pub use_implicit_ssl_tls: Option<bool>,
+}
+
+#[derive(Clone, Debug, PartialEq, Deserialize)]
+#[serde(rename_all = "camelCase")]
+#[crate::export(object, use_nullable = false)]
+pub struct ObjectStorageConfig {
+    pub managed: Option<bool>,
+    pub base_url: Option<String>,
+    pub bucket: Option<String>,
+    pub prefix: Option<String>,
+    pub endpoint: Option<String>,
+    pub region: Option<String>,
+    pub access_key: Option<String>,
+    pub secret_key: Option<String>,
+    pub use_ssl: Option<bool>,
+    pub connnect_over_proxy: Option<bool>,
+    pub set_public_read_on_upload: Option<bool>,
+    pub s3_force_path_style: Option<bool>,
+}
+
+#[crate::export]
+pub fn read_server_config() -> ServerConfig {
+    let cwd = env::current_dir().unwrap();
+    let yml = fs::File::open(cwd.join("../../.config/default.yml"))
+        .expect("Failed to open '.config/default.yml'");
+    serde_yaml::from_reader(yml).expect("Failed to parse yaml")
+}
+
+pub static SERVER_CONFIG: Lazy<ServerConfig> = Lazy::new(read_server_config);
diff --git a/packages/backend-rs/src/lib.rs b/packages/backend-rs/src/lib.rs
index 3a8bb4550e..dff5073d34 100644
--- a/packages/backend-rs/src/lib.rs
+++ b/packages/backend-rs/src/lib.rs
@@ -1,5 +1,6 @@
 pub use macro_rs::export;
 
+pub mod config;
 pub mod database;
 pub mod misc;
 pub mod model;
diff --git a/packages/backend/package.json b/packages/backend/package.json
index d5cc8bd665..a9e3ded008 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -67,7 +67,6 @@
 		"ioredis": "5.3.2",
 		"ip-cidr": "4.0.0",
 		"is-svg": "5.0.0",
-		"js-yaml": "4.1.0",
 		"json5": "2.2.3",
 		"jsonld": "8.3.2",
 		"jsrsasign": "11.1.0",
@@ -137,7 +136,6 @@
 		"@types/content-disposition": "^0.5.8",
 		"@types/escape-regexp": "0.0.3",
 		"@types/fluent-ffmpeg": "2.1.24",
-		"@types/js-yaml": "4.0.9",
 		"@types/jsonld": "1.5.13",
 		"@types/jsrsasign": "10.5.13",
 		"@types/katex": "0.16.7",
diff --git a/packages/backend/src/config/load.ts b/packages/backend/src/config/load.ts
index 2ff3309264..2b286b9439 100644
--- a/packages/backend/src/config/load.ts
+++ b/packages/backend/src/config/load.ts
@@ -5,8 +5,8 @@
 import * as fs from "node:fs";
 import { fileURLToPath } from "node:url";
 import { dirname } from "node:path";
-import * as yaml from "js-yaml";
-import type { Source, Mixin } from "./types.js";
+import type { Mixin } from "./types.js";
+import { readServerConfig } from "backend-rs";
 
 const _filename = fileURLToPath(import.meta.url);
 const _dirname = dirname(_filename);
@@ -32,7 +32,7 @@ export default function load() {
 			"utf-8",
 		),
 	);
-	const config = yaml.load(fs.readFileSync(path, "utf-8")) as Source;
+	const config = readServerConfig();
 
 	const mixin = {} as Mixin;
 
diff --git a/packages/backend/src/config/types.ts b/packages/backend/src/config/types.ts
index 882e429c79..6b593d3b2d 100644
--- a/packages/backend/src/config/types.ts
+++ b/packages/backend/src/config/types.ts
@@ -1,134 +1,7 @@
-/**
- * ユーザーが設定する必要のある情報
- */
-export type Source = {
-	repository_url?: string;
-	feedback_url?: string;
-	url: string;
-	port: number;
-	bind?: string;
-	disableHsts?: boolean;
-	db: {
-		host: string;
-		port: number;
-		db: string;
-		user: string;
-		pass: string;
-		disableCache?: boolean;
-		extra?: { [x: string]: string };
-	};
-	redis: {
-		host: string;
-		port: number;
-		family?: number;
-		pass?: string;
-		db?: number;
-		prefix?: string;
-		user?: string;
-		tls?: { [y: string]: string };
-	};
-	cacheServer?: {
-		host: string;
-		port: number;
-		family?: number;
-		pass?: string;
-		db?: number;
-		prefix?: string;
-		user?: string;
-		tls?: { [z: string]: string };
-	};
-
-	proxy?: string;
-	proxySmtp?: string;
-	proxyBypassHosts?: string[];
-
-	allowedPrivateNetworks?: string[];
-
-	maxFileSize?: number;
-
-	accesslog?: string;
-
-	clusterLimits?: {
-		web?: number;
-		queue?: number;
-	};
-
-	cuid?: {
-		length?: number;
-		fingerprint?: string;
-	};
-
-	outgoingAddress?: string;
-	outgoingAddressFamily?: "ipv4" | "ipv6" | "dual";
-
-	deliverJobConcurrency?: number;
-	inboxJobConcurrency?: number;
-	deliverJobPerSec?: number;
-	inboxJobPerSec?: number;
-	deliverJobMaxAttempts?: number;
-	inboxJobMaxAttempts?: number;
-
-	logLevel?: string[];
-
-	syslog: {
-		host: string;
-		port: number;
-	};
-
-	mediaProxy?: string;
-	proxyRemoteFiles?: boolean;
-
-	twa: {
-		nameSpace?: string;
-		packageName?: string;
-		sha256CertFingerprints?: string[];
-	};
-
-	reservedUsernames?: string[];
-
-	// Managed hosting stuff
-	maxUserSignups?: number;
-	isManagedHosting?: boolean;
-	maxNoteLength?: number;
-	maxCaptionLength?: number;
-	deepl: {
-		managed?: boolean;
-		authKey?: string;
-		isPro?: boolean;
-	};
-	libreTranslate: {
-		managed?: boolean;
-		apiUrl?: string;
-		apiKey?: string;
-	};
-	email: {
-		managed?: boolean;
-		address?: string;
-		host?: string;
-		port?: number;
-		user?: string;
-		pass?: string;
-		useImplicitSslTls?: boolean;
-	};
-	objectStorage: {
-		managed?: boolean;
-		baseUrl?: string;
-		bucket?: string;
-		prefix?: string;
-		endpoint?: string;
-		region?: string;
-		accessKey?: string;
-		secretKey?: string;
-		useSsl?: boolean;
-		connnectOverProxy?: boolean;
-		setPublicReadOnUpload?: boolean;
-		s3ForcePathStyle?: boolean;
-	};
-	summalyProxyUrl?: string;
-};
+import type { ServerConfig } from "backend-rs";
 
 /**
- * Misskeyが自動的に(ユーザーが設定した情報から推論して)設定する情報
+ * Firefish が自動的に(ユーザーが設定した情報から推論して)設定する情報
  */
 export type Mixin = {
 	version: string;
@@ -144,4 +17,4 @@ export type Mixin = {
 	clientEntry: string;
 };
 
-export type Config = Source & Mixin;
+export type Config = ServerConfig & Mixin;
diff --git a/packages/backend/src/server/well-known.ts b/packages/backend/src/server/well-known.ts
index 5177c36908..fc339eaad6 100644
--- a/packages/backend/src/server/well-known.ts
+++ b/packages/backend/src/server/well-known.ts
@@ -74,22 +74,6 @@ router.get("/.well-known/host-meta.json", async (ctx) => {
 	};
 });
 
-if (config.twa != null) {
-	router.get("/.well-known/assetlinks.json", async (ctx) => {
-		ctx.set("Content-Type", "application/json");
-		ctx.body = [
-			{
-				relation: ["delegate_permission/common.handle_all_urls"],
-				target: {
-					namespace: config.twa.nameSpace,
-					package_name: config.twa.packageName,
-					sha256_cert_fingerprints: config.twa.sha256CertFingerprints,
-				},
-			},
-		];
-	});
-}
-
 router.get("/.well-known/nodeinfo", async (ctx) => {
 	ctx.body = { links };
 });
diff --git a/packages/macro-rs/src/lib.rs b/packages/macro-rs/src/lib.rs
index 668d366cb1..c1a24a93cf 100644
--- a/packages/macro-rs/src/lib.rs
+++ b/packages/macro-rs/src/lib.rs
@@ -7,13 +7,14 @@ pub fn export(
     attr: proc_macro::TokenStream,
     item: proc_macro::TokenStream,
 ) -> proc_macro::TokenStream {
-	let attr: TokenStream = attr.into();
-	let item: TokenStream = item.into();
+    let attr: TokenStream = attr.into();
+    let item: TokenStream = item.into();
 
-	quote! {
-		#[cfg_attr(feature = "napi", macro_rs::napi(#attr))]
-		#item
-	}.into()
+    quote! {
+        #[cfg_attr(feature = "napi", macro_rs::napi(#attr))]
+        #item
+    }
+    .into()
 }
 
 /// Creates extra wrapper function for napi.