feat: add logging service with winston

package.json

@@ -36,10 +36,12 @@
 		"bcrypt": "^5.1.1",
 		"class-transformer": "^0.5.1",
 		"class-validator": "^0.14.1",
+		"nest-winston": "^1.9.7",
 		"pg": "^8.13.1",
 		"reflect-metadata": "^0.2.0",
 		"rxjs": "^7.8.1",
-		"typeorm": "^0.3.20"
+		"typeorm": "^0.3.20",
+		"winston": "^3.17.0"
 	},
 	"devDependencies": {
 		"@commitlint/cli": "^19.6.0",

src/config/logger.config.ts

@@ -0,0 +1,16 @@
+import { format, transports } from 'winston';
+const isProduction = process.env.APP_ENV === 'production';
+export const loggerConfig = {
+	format: format.combine(
+		format.timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
+		format.printf(({ level, message, timestamp }) => {
+			return `${timestamp} [${level}]: ${message}`;
+		}),
+	),
+	transports: isProduction
+		? [
+				new transports.File({ filename: 'logs/errors.log', level: 'error' }),
+				new transports.File({ filename: 'logs/all.log' }),
+			]
+		: [new transports.Console({ format: format.combine(format.colorize({ all: true })) })],
+};

src/main.ts

@@ -1,12 +1,18 @@
 import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
+import { WinstonModule } from 'nest-winston';
+import { loggerConfig } from '@/config/logger.config';
+import { Logger } from '@nestjs/common';
 
 async function bootstrap(): Promise<void> {
-	const app = await NestFactory.create(AppModule);
-
-	await app.listen(process.env.APP_PORT ?? 3000, () => {
-		console.info('Listening to server....');
-		console.info(`Server listening at port http://localhost:${process.env.APP_PORT}`);
+	const logger = new Logger();
+	const port = process.env.APP_PORT ?? 3000;
+	const app = await NestFactory.create(AppModule, {
+		// this will overwrite the default logger of nestJS with custom winston logger
+		logger: WinstonModule.createLogger(loggerConfig),
+	});
+	await app.listen(port, () => {
+		logger.log(`App is listening on port ${port}`);
 	});
 }