From 2fb3924075d95972c8a2b3073ee5d2886512b3a4 Mon Sep 17 00:00:00 2001
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 <17376330+u1-liquid@users.noreply.github.com>
Date: Mon, 8 Jan 2024 20:26:39 +0900
Subject: [PATCH] =?UTF-8?q?feat(logging):=20JSON=E5=BD=A2=E5=BC=8F?=
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---
 packages/backend/src/boot/master.ts |  4 ++--
 packages/backend/src/env.ts         |  1 +
 packages/backend/src/logger.ts      | 15 ++++++++++++++-
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/packages/backend/src/boot/master.ts b/packages/backend/src/boot/master.ts
index 623cc964ac..5ea54a1bdf 100644
--- a/packages/backend/src/boot/master.ts
+++ b/packages/backend/src/boot/master.ts
@@ -28,7 +28,7 @@ const bootLogger = logger.createSubLogger('boot', 'magenta', false);
 const themeColor = chalk.hex('#86b300');
 
 function greet() {
-	if (!envOption.quiet) {
+	if (!envOption.quiet && !envOption.logJson) {
 		//#region Misskey logo
 		const v = `v${meta.version}`;
 		console.log(themeColor('  _____ _         _           '));
@@ -46,7 +46,7 @@ function greet() {
 	}
 
 	bootLogger.info('Welcome to Misskey!');
-	bootLogger.info(`Misskey v${meta.version}`, null, true);
+	bootLogger.info(`Misskey v${meta.version}`, { version: meta.version, hostname: os.hostname(), pid: process.pid }, true);
 }
 
 /**
diff --git a/packages/backend/src/env.ts b/packages/backend/src/env.ts
index af1c3bdd3c..e5a88a8f54 100644
--- a/packages/backend/src/env.ts
+++ b/packages/backend/src/env.ts
@@ -9,6 +9,7 @@ const envOption = {
 	noDaemons: false,
 	disableClustering: false,
 	verbose: false,
+	logJson: false,
 	withLogTime: false,
 	quiet: false,
 };
diff --git a/packages/backend/src/logger.ts b/packages/backend/src/logger.ts
index 5c10559ec6..48d7afa488 100644
--- a/packages/backend/src/logger.ts
+++ b/packages/backend/src/logger.ts
@@ -41,7 +41,7 @@ export default class Logger {
 
 	@bindThis
 	private log(level: Level, message: string, data?: Record<string, any> | null, important = false, subContexts: Context[] = [], store = true): void {
-		if (envOption.quiet) return;
+		if (envOption.quiet && !envOption.logJson) return;
 		if (!this.store) store = false;
 		if (level === 'debug') store = false;
 
@@ -50,6 +50,19 @@ export default class Logger {
 			return;
 		}
 
+		if (envOption.logJson) {
+			console.log(JSON.stringify({
+				time: new Date().toISOString(),
+				level: level,
+				message: message,
+				data: data,
+				important: important,
+				context: [this.context].concat(subContexts).join('.'),
+				cluster: cluster.isPrimary ? 'primary' : `worker-${cluster.worker!.id}`,
+			}));
+			return;
+		}
+
 		const time = dateFormat(new Date(), 'HH:mm:ss');
 		const worker = cluster.isPrimary ? '*' : cluster.worker!.id;
 		const l =