feat: add winston

server/src/index.js

@@ -16,13 +16,13 @@ import { globalRateLimit } from './middleware/rateLimiter.js'
 import sessionMiddleware from './middleware/session.js'
 import expiryRemovalScheduler from './containers/expiryChecker.js'
 import setupTest from './utils/setupTest.js'
+import logger from './utils/logger.js'
 
 async function main() {
   if (!config.secret) {
-    console.warn(
-      'No SECRET_KEY found in .env! To set up a persistent key, please run the setup script:'
+    logger.error(
+      'No SECRET_KEY found in .env! To set up a persistent key, please run `yarn setup`:'
     )
-    console.warn('yarn setup')
     process.exit(1)
   }
 

server/src/utils/logger.js

@@ -0,0 +1,29 @@
+import winston from 'winston'
+
+const logger = winston.createLogger({
+  level: 'info',
+  format: winston.format.json(),
+  defaultMeta: { service: 'user-service' },
+  transports: [
+    //
+    // - Write all logs with importance level of `error` or less to `error.log`
+    // - Write all logs with importance level of `info` or less to `combined.log`
+    //
+    new winston.transports.File({ filename: 'error.log', level: 'error' }),
+    new winston.transports.File({ filename: 'combined.log' }),
+  ],
+})
+
+//
+// If we're not in production then log to the `console` with the format:
+// `${info.level}: ${info.message} JSON.stringify({ ...rest }) `
+//
+if (process.env.NODE_ENV !== 'production') {
+  logger.add(
+    new winston.transports.Console({
+      format: winston.format.simple(),
+    })
+  )
+}
+
+export default logger