diff --git a/liblogosdelivery/logos_delivery_api/node_api.nim b/liblogosdelivery/logos_delivery_api/node_api.nim
index cd644abd7..90630717b 100644
--- a/liblogosdelivery/logos_delivery_api/node_api.nim
+++ b/liblogosdelivery/logos_delivery_api/node_api.nim
@@ -1,4 +1,4 @@
-import std/[json, strutils]
+import std/[json, strutils, tables]
 import chronos, chronicles, results, confutils, confutils/std/net, ffi
 import
   waku/factory/waku,
@@ -23,22 +23,50 @@ registerReqFFI(CreateNodeRequest, ctx: ptr FFIContext[Waku]):
     try:
       jsonNode = parseJson($configJson)
     except Exception:
+      let exceptionMsg = getCurrentExceptionMsg()
+      error "Failed to parse config JSON",
+        error = exceptionMsg, configJson = $configJson
       return err(
-        "Failed to parse config JSON: " & getCurrentExceptionMsg() &
-          " configJson string: " & $configJson
+        "Failed to parse config JSON: " & exceptionMsg & " configJson string: " &
+          $configJson
       )
 
+    var jsonFields: Table[string, (string, JsonNode)]
+    for key, value in jsonNode:
+      let lowerKey = key.toLowerAscii()
+
+      if jsonFields.hasKey(lowerKey):
+        error "Duplicate configuration option found when normalized to lowercase",
+          key = key
+        return err(
+          "Duplicate configuration option found when normalized to lowercase: '" & key &
+            "'"
+        )
+
+      jsonFields[lowerKey] = (key, value)
+
     for confField, confValue in fieldPairs(conf):
-      if jsonNode.contains(confField):
-        let formattedString = ($jsonNode[confField]).strip(chars = {'\"'})
+      let lowerField = confField.toLowerAscii()
+      if jsonFields.hasKey(lowerField):
+        let (jsonKey, jsonValue) = jsonFields[lowerField]
+        let formattedString = ($jsonValue).strip(chars = {'\"'})
         try:
           confValue = parseCmdArg(typeof(confValue), formattedString)
         except Exception:
           return err(
-            "Failed to parse field '" & confField & "': " & getCurrentExceptionMsg() &
-              ". Value: " & formattedString
+            "Failed to parse field '" & confField & "' from JSON key '" & jsonKey & "': " &
+              getCurrentExceptionMsg() & ". Value: " & formattedString
           )
 
+        jsonFields.del(lowerField)
+
+    if jsonFields.len > 0:
+      var unknownKeys = newSeq[string]()
+      for _, (jsonKey, _) in pairs(jsonFields):
+        unknownKeys.add(jsonKey)
+      error "Unrecognized configuration option(s) found", option = unknownKeys
+      return err("Unrecognized configuration option(s) found: " & $unknownKeys)
+
     # Create the node
     ctx.myLib[] = (await api.createNode(conf)).valueOr:
       let errMsg = $error