diff --git a/src/libs/logger.ts b/src/libs/logger.ts
index ab73450..54c46fd 100644
--- a/src/libs/logger.ts
+++ b/src/libs/logger.ts
@@ -15,9 +15,14 @@ interface ApiLogData {
   body: string | undefined
 }
 
+/* 현재 날짜 반환 함수 (YYYY-MM-DD 형식) */
+const getCurrentDate = (): string => {
+  return new Date().toISOString().split('T')[0]
+}
+
 /* 날짜별 로그 파일 경로 생성 함수 */
 const getLogFilePath = (): string => {
-  const today = new Date().toISOString().split('T')[0] // YYYY-MM-DD 형식
+  const today: string = getCurrentDate()
   return join(process.cwd(), 'logs', `onsite-survey-${today}.log`)
 }
 
@@ -25,15 +30,10 @@ const getLogFilePath = (): string => {
 class DailyLogger {
   private currentDate: string
   private logger: pino.Logger
-  private destination: ReturnType<typeof pino.destination>
+  private destination?: ReturnType<typeof pino.destination>
 
   constructor() {
-    this.currentDate = new Date().toISOString().split('T')[0]
-    this.destination = pino.destination({
-      dest: getLogFilePath(),
-      mkdir: true,
-      sync: false,
-    })
+    this.currentDate = getCurrentDate()
     this.logger = this.createLogger()
 
     /* kill signal 핸들러 등록 */
@@ -42,14 +42,31 @@ class DailyLogger {
   }
 
   private async handleShutdown(): Promise<void> {
-    this.destination.flushSync()
-    this.destination.end()
+    if (isProduction && this.destination) {
+      this.destination.flushSync()
+      this.destination.end()
+    }
+    this.logger.flush()
   }
 
   private createLogger(): pino.Logger {
+    if (!isProduction) return pino({ level: 'silent' })
+
+    /* 기존 destination 종료 */
+    if (this.destination) {
+      this.destination.flushSync()
+      this.destination.end()
+    }
+    /* 새로운 destination 생성 */
+    this.destination = pino.destination({
+      dest: getLogFilePath(),
+      mkdir: true,
+      sync: false,
+    })
+
     return pino(
       {
-        level: isProduction ? 'info' : 'silent',
+        level: 'info',
         timestamp: pino.stdTimeFunctions.isoTime,
       },
       this.destination,
@@ -57,24 +74,16 @@ class DailyLogger {
   }
 
   public info(obj: any, msg?: string): void {
-    const today = new Date().toISOString().split('T')[0]
-
-    if (today !== this.currentDate) {
-      /* 기존 destination 종료 */
-      this.destination.flushSync()
-      this.destination.end()
-
-      /* 새로운 destination 생성 */
-      this.destination = pino.destination({
-        dest: getLogFilePath(),
-        mkdir: true,
-        sync: false,
-      })
-      this.currentDate = today
-      this.logger = this.createLogger()
+    try {
+      const today: string = getCurrentDate()
+      if (today !== this.currentDate) {
+        this.currentDate = today
+        this.logger = this.createLogger()
+      }
+      this.logger.info(obj, msg)
+    } catch (error) {
+      console.error(`[DailyLogger] Failed to write log: ${error}`)
     }
-
-    this.logger.info(obj, msg)
   }
 }
 
@@ -83,13 +92,26 @@ const dailyLogger = new DailyLogger()
 
 /* API 로그 기록 함수 */
 export const writeApiLog = async (request: NextRequest, responseStatus: number): Promise<void> => {
+  if (!isProduction) return
+
+  let bodyString: string | undefined
+  if (
+    request.method === 'POST' &&
+    (request.headers.get('content-type') === 'multipart/form-data' || request.headers.get('content-type') === 'application/x-www-form-urlencoded')
+  ) {
+    const formData = await request.formData()
+    bodyString = JSON.stringify(Object.fromEntries(formData))
+  } else {
+    bodyString = await request.text()
+  }
+
   const logData: ApiLogData = {
     responseStatus: responseStatus,
     method: request.method,
     url: request.url,
     // headers: Object.fromEntries(request.headers),
     query: Object.fromEntries(new URL(request.url).searchParams),
-    body: request.body ? await request.text() : undefined,
+    body: bodyString,
   }
   dailyLogger.info(logData, 'API Request')
 }