diff --git a/lib/request.js b/lib/request.js
index 1a8f1432..20846e23 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -1,11 +1,10 @@
 'use strict'
 
+const DEBUG = process.env.NODE_DEBUG === 'hafas-client'
+
 const {join} = require('path')
 const createHash = require('create-hash')
-let captureStackTrace = () => {}
-if (process.env.NODE_DEBUG === 'hafas-client') {
-	captureStackTrace = require('capture-stack-trace')
-}
+const captureStackTrace = DEBUG ? require('capture-stack-trace') : () => {}
 const {stringify} = require('query-string')
 const Promise = require('pinkie-promise')
 const {fetch} = require('fetch-ponyfill')({Promise})
@@ -31,6 +30,8 @@ const request = (profile, userAgent, opt, data) => {
 		lang: opt.language || 'en', // todo: is it `eng` actually?
 		svcReqL: [data]
 	})
+	if (DEBUG) console.error(JSON.stringify(body))
+
 	const req = profile.transformReq({
 		method: 'post',
 		// todo: CORS? referrer policy?
@@ -84,6 +85,8 @@ const request = (profile, userAgent, opt, data) => {
 		return res.json()
 	})
 	.then((b) => {
+		if (DEBUG) console.error(JSON.stringify(b))
+
 		if (b.err) {
 			err.message = b.err
 			throw err