diff --git a/src/api/common/add-file-to-drive.ts b/src/api/common/add-file-to-drive.ts
index dff2d52356..f9c22ccacd 100644
--- a/src/api/common/add-file-to-drive.ts
+++ b/src/api/common/add-file-to-drive.ts
@@ -14,16 +14,16 @@ import { Duplex } from 'stream';
 const log = debug('misskey:register-drive-file');
 
 const addToGridFS = (name, binary, metadata): Promise<any> => new Promise(async (resolve, reject) => {
-	const dataStream = new Duplex()
-	dataStream.push(binary)
-	dataStream.push(null)
+	const dataStream = new Duplex();
+	dataStream.push(binary);
+	dataStream.push(null);
 
-	const bucket = await getGridFSBucket()
-	const writeStream = bucket.openUploadStream(name, { metadata })
-	writeStream.once('finish', (doc) => { resolve(doc) })
-	writeStream.on('error', reject)
-	dataStream.pipe(writeStream)
-})
+	const bucket = await getGridFSBucket();
+	const writeStream = bucket.openUploadStream(name, { metadata });
+	writeStream.once('finish', (doc) => { resolve(doc); });
+	writeStream.on('error', reject);
+	dataStream.pipe(writeStream);
+});
 
 /**
  * Add file to drive
diff --git a/src/api/endpoints/drive/files.ts b/src/api/endpoints/drive/files.ts
index 035916b309..53b48a8bec 100644
--- a/src/api/endpoints/drive/files.ts
+++ b/src/api/endpoints/drive/files.ts
@@ -63,5 +63,5 @@ module.exports = async (params, user, app) => {
 
 	// Serialize
 	const _files = await Promise.all(files.map(file => serialize(file)));
-	return _files
+	return _files;
 };
diff --git a/src/api/endpoints/drive/files/show.ts b/src/api/endpoints/drive/files/show.ts
index 0a19b19939..3c7cf774f9 100644
--- a/src/api/endpoints/drive/files/show.ts
+++ b/src/api/endpoints/drive/files/show.ts
@@ -33,5 +33,5 @@ module.exports = async (params, user) => {
 		detail: true
 	});
 
-	return _file
+	return _file;
 };
diff --git a/src/api/endpoints/drive/files/update.ts b/src/api/endpoints/drive/files/update.ts
index 7a6d2562fb..4e56b30ace 100644
--- a/src/api/endpoints/drive/files/update.ts
+++ b/src/api/endpoints/drive/files/update.ts
@@ -20,7 +20,6 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 	const [fileId, fileIdErr] = $(params.file_id).id().$;
 	if (fileIdErr) return rej('invalid file_id param');
 
-
 	// Fetch file
 	const file = await DriveFile
 		.findOne({
@@ -32,7 +31,7 @@ module.exports = (params, user) => new Promise(async (res, rej) => {
 		return rej('file-not-found');
 	}
 
-	const updateQuery: any = {}
+	const updateQuery: any = {};
 
 	// Get 'name' parameter
 	const [name, nameErr] = $(params.name).optional.string().pipe(validateFileName).$;
diff --git a/src/api/endpoints/posts/timeline.ts b/src/api/endpoints/posts/timeline.ts
index 978825a109..203413e23a 100644
--- a/src/api/endpoints/posts/timeline.ts
+++ b/src/api/endpoints/posts/timeline.ts
@@ -92,6 +92,6 @@ module.exports = async (params, user, app) => {
 		});
 
 	// Serialize
-	const _timeline = await Promise.all(timeline.map(post => serialize(post, user)))
-	return _timeline
+	const _timeline = await Promise.all(timeline.map(post => serialize(post, user)));
+	return _timeline;
 };
diff --git a/src/api/models/drive-file.ts b/src/api/models/drive-file.ts
index 79a87f6572..8968d065cd 100644
--- a/src/api/models/drive-file.ts
+++ b/src/api/models/drive-file.ts
@@ -8,14 +8,14 @@ const collection = monkDb.get('drive_files.files');
 export default collection as any; // fuck type definition
 
 const getGridFSBucket = async (): Promise<mongodb.GridFSBucket> => {
-	const db = await nativeDbConn()
+	const db = await nativeDbConn();
 	const bucket = new mongodb.GridFSBucket(db, {
 		bucketName: 'drive_files'
-	})
-	return bucket
-}
+	});
+	return bucket;
+};
 
-export { getGridFSBucket }
+export { getGridFSBucket };
 
 export function validateFileName(name: string): boolean {
 	return (
diff --git a/src/api/serializers/drive-file.ts b/src/api/serializers/drive-file.ts
index e749f80387..2af7db5726 100644
--- a/src/api/serializers/drive-file.ts
+++ b/src/api/serializers/drive-file.ts
@@ -40,13 +40,13 @@ export default (
 		_file = deepcopy(file);
 	}
 
-	if (!_file) return reject('invalid file arg.')
+	if (!_file) return reject('invalid file arg.');
 
 	// rendered target
 	let _target: any = {};
 
 	_target.id = _file._id;
-	_target.created_at = _file.uploadDate
+	_target.created_at = _file.uploadDate;
 
 	_target = Object.assign(_target, _file.metadata);
 
diff --git a/src/db/mongodb.ts b/src/db/mongodb.ts
index 75f1a1d3c6..c978e6460f 100644
--- a/src/db/mongodb.ts
+++ b/src/db/mongodb.ts
@@ -16,7 +16,7 @@ export default db;
 /**
  * MongoDB native module (officialy)
  */
-import * as mongodb from 'mongodb'
+import * as mongodb from 'mongodb';
 
 let mdb: mongodb.Db;
 
@@ -25,14 +25,14 @@ const nativeDbConn = async (): Promise<mongodb.Db> => {
 
 	const db = await ((): Promise<mongodb.Db> => new Promise((resolve, reject) => {
 		mongodb.MongoClient.connect(uri, (e, db) => {
-			if (e) return reject(e)
-			resolve(db)
-		})
-	}))()
+			if (e) return reject(e);
+			resolve(db);
+		});
+	}))();
 
-	mdb = db
+	mdb = db;
 
-	return db
-}
+	return db;
+};
 
-export { nativeDbConn }
+export { nativeDbConn };
diff --git a/src/file/server.ts b/src/file/server.ts
index f38599b89c..375f29487d 100644
--- a/src/file/server.ts
+++ b/src/file/server.ts
@@ -97,7 +97,7 @@ app.get('/:id', async (req, res) => {
 		return;
 	}
 
-	const fileId = new mongodb.ObjectID(req.params.id)
+	const fileId = new mongodb.ObjectID(req.params.id);
 	const file = await DriveFile.findOne({ _id: fileId });
 
 	if (file == null) {
@@ -105,18 +105,18 @@ app.get('/:id', async (req, res) => {
 		return;
 	}
 
-	const bucket = await getGridFSBucket()
+	const bucket = await getGridFSBucket();
 
 	const buffer = await ((id): Promise<Buffer> => new Promise((resolve, reject) => {
-		const chunks = []
-		const readableStream = bucket.openDownloadStream(id)
-	  readableStream.on('data', chunk => {
+		const chunks = [];
+		const readableStream = bucket.openDownloadStream(id);
+	 readableStream.on('data', chunk => {
 			chunks.push(chunk);
-		})
+		});
 		readableStream.on('end', () => {
-			resolve(Buffer.concat(chunks))
-		})
-	}))(fileId)
+			resolve(Buffer.concat(chunks));
+		});
+	}))(fileId);
 
 	send(buffer, file.metadata.type, req, res);
 });
@@ -128,7 +128,7 @@ app.get('/:id/:name', async (req, res) => {
 		return;
 	}
 
-	const fileId = new mongodb.ObjectID(req.params.id)
+	const fileId = new mongodb.ObjectID(req.params.id);
 	const file = await DriveFile.findOne({ _id: fileId });
 
 	if (file == null) {
@@ -136,18 +136,18 @@ app.get('/:id/:name', async (req, res) => {
 		return;
 	}
 
-	const bucket = await getGridFSBucket()
+	const bucket = await getGridFSBucket();
 
 	const buffer = await ((id): Promise<Buffer> => new Promise((resolve, reject) => {
-		const chunks = []
-		const readableStream = bucket.openDownloadStream(id)
-	  readableStream.on('data', chunk => {
+		const chunks = [];
+		const readableStream = bucket.openDownloadStream(id);
+	 readableStream.on('data', chunk => {
 			chunks.push(chunk);
-		})
+		});
 		readableStream.on('end', () => {
-			resolve(Buffer.concat(chunks))
-		})
-	}))(fileId)
+			resolve(Buffer.concat(chunks));
+		});
+	}))(fileId);
 
 	send(buffer, file.metadata.type, req, res);
 });