diff --git a/src/backend/hafas/errors.nim b/src/backend/hafas/errors.nim
new file mode 100644
index 0000000..0ab1270
--- /dev/null
+++ b/src/backend/hafas/errors.nim
@@ -0,0 +1,199 @@
+import asynchttpserver
+import ../../types
+
+proc parseError*(errstr: string): hafasException =
+  case errstr:
+  of "H_UNKNOWN":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "unknown internal error",
+      statusCode: Http500,
+    )
+  of "AUTH":
+    return hafasException(
+      code: ACCESS_DENIED,
+      message: "invalid or missing authentication data",
+      statusCode: Http401,
+    )
+  of "R0001":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "unknown method",
+      statusCode: Http400,
+    )
+  of "R0002":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "invalid or missing request parameters",
+      statusCode: Http400,
+    )
+  of "R0007":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "internal communication error",
+      statusCode: Http500,
+    )
+  of "R5000":
+    return hafasException(
+      code: ACCESS_DENIED,
+      message: "access denied",
+      statusCode: Http401,
+    )
+  of "S1":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "journeys search: a connection to the backend server couldn\'t be established",
+      statusCode: Http503,
+    )
+  of "LOCATION":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "location/stop not found",
+      statusCode: Http400,
+    )
+  of "H390":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: departure/arrival station replaced",
+      statusCode: Http400,
+    )
+  of "H410":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "journeys search: incomplete response due to timetable change"
+    )
+  of "H455":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: prolonged stop",
+      statusCode: Http400,
+    )
+  of "H460":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: stop(s) passed multiple times",
+      statusCode: Http400,
+    )
+  of "H500":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: too many trains, connection is not complete",
+      statusCode: Http400,
+    )
+  of "H890":
+    return hafasException(
+      code: NOT_FOUND,
+      message: "journeys search unsuccessful",
+      statusCode: Http404,
+    )
+  of "H891":
+    return hafasException(
+      code: NOT_FOUND,
+      message: "journeys search: no route found, try with an intermediate stations",
+      statusCode: Http404,
+    )
+  of "H892":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: query too complex, try less intermediate stations",
+      statusCode: Http400,
+    )
+  of "H895":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: departure & arrival are too near",
+      statusCode: Http400,
+    )
+  of "H899":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "journeys search unsuccessful or incomplete due to timetable change"
+    )
+  of "H900":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "journeys search unsuccessful or incomplete due to timetable change"
+    )
+  of "H9220":
+    return hafasException(
+      code: NOT_FOUND,
+      message: "journeys search: no stations found close to the address",
+      statusCode: Http400,
+    )
+  of "H9230":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "journeys search: an internal error occured",
+      statusCode: Http500,
+    )
+  of "H9240":
+    return hafasException(
+      code: NOT_FOUND,
+      message: "journeys search unsuccessful",
+      statusCode: Http404,
+    )
+  of "H9250":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "journeys search: leg query interrupted",
+      statusCode: Http500,
+    )
+  of "H9260":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: unknown departure station",
+      statusCode: Http400,
+    )
+  of "H9280":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: unknown intermediate station",
+      statusCode: Http400,
+    )
+  of "H9300":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: unknown arrival station",
+      statusCode: Http400,
+    )
+  of "H9320":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: the input is incorrect or incomplete",
+      statusCode: Http400,
+    )
+  of "H9360":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: error in a data field",
+      statusCode: Http400,
+    )
+  of "H9380":
+    return hafasException(
+      code: INVALID_REQUEST,
+      message: "journeys search: departure/arrival/intermediate station defined more than once",
+      statusCode: Http400,
+    )
+  of "SQ001":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "no departures/arrivals data available",
+      statusCode: Http503,
+    )
+  of "SQ005":
+    return hafasException(
+      code: NOT_FOUND,
+      message: "no trips found",
+      statusCode: Http404,
+    )
+  of "TI001":
+    return hafasException(
+      code: SERVER_ERROR,
+      message: "no trip info available",
+      statusCode: Http503,
+    )
+  return hafasException(
+    code: SERVER_ERROR,
+    message: "unknown HAFAS exception " & errstr,
+    statusCode: Http500,
+  )
diff --git a/src/backend/hafas/util.nim b/src/backend/hafas/util.nim
index 11ab35b..44dba35 100644
--- a/src/backend/hafas/util.nim
+++ b/src/backend/hafas/util.nim
@@ -3,6 +3,7 @@ import asyncdispatch
 import md5
 import json
 import strutils
+import errors
 
 proc slug*(s: string): string =
   for c in s:
@@ -47,4 +48,10 @@ proc request*(req: JsonNode): Future[JsonNode] {.async.} =
   #echo pretty body
   let req = await client.request(url, httpMethod = HttpPost, body = $body)
   let resp = await req.body
-  return parseJson(resp){"svcResL"}{0}
+  let data = parseJson(resp)
+
+  let error = data{"svcResL"}{0}{"err"}.getStr()
+  if error != "OK":
+    raise parseError(error)
+
+  return data{"svcResL"}{0}
diff --git a/src/types.nim b/src/types.nim
index f93dfa5..b0094e7 100644
--- a/src/types.nim
+++ b/src/types.nim
@@ -163,9 +163,6 @@ type
     polylines*:          Option[bool]               #default value: false     support in hafas backend: ✅
     tickets*:            Option[bool]               #default value: false     support in hafas backend: ✅
 
-  notFoundException* = object of Exception
-  errorException*    = object of Exception
-
   Polyline* = object
     `type`*:        string
     features*:      seq[Feature]
@@ -192,6 +189,18 @@ type
     latitiude*:    float
     longitude*:    float
 
+
+  notFoundException* = object of Exception
+  errorException*    = object of Exception
+
+  hafasExceptionKind* = enum
+    SERVER_ERROR, ACCESS_DENIED, INVALID_REQUEST, NOT_FOUND
+
+  hafasException*    = ref object of Exception
+    code*: hafasExceptionKind
+    message*: string
+    statusCode*: HttpCode
+
 const MODES* = [
   Train,       # nationalExp
   Train,       # national