diff --git a/hydra-cluster/hydra-cluster.cabal b/hydra-cluster/hydra-cluster.cabal
index 86dd597c8f0..087b6f84763 100644
--- a/hydra-cluster/hydra-cluster.cabal
+++ b/hydra-cluster/hydra-cluster.cabal
@@ -160,7 +160,7 @@ test-suite tests
   build-depends:
     , aeson
     , async
-    , base               >=4.7 && <5
+    , base                              >=4.7 && <5
     , bytestring
     , containers
     , directory
@@ -168,7 +168,7 @@ test-suite tests
     , hspec
     , hydra-cardano-api
     , hydra-cluster
-    , hydra-node
+    , hydra-node:{hydra-node, testlib}
     , hydra-prelude
     , hydra-test-utils
     , io-classes
diff --git a/hydra-cluster/test/Test/Hydra/Cluster/CardanoCliSpec.hs b/hydra-cluster/test/Test/Hydra/Cluster/CardanoCliSpec.hs
index 61bdbb17f35..d74ff6e76d9 100644
--- a/hydra-cluster/test/Test/Hydra/Cluster/CardanoCliSpec.hs
+++ b/hydra-cluster/test/Test/Hydra/Cluster/CardanoCliSpec.hs
@@ -11,6 +11,7 @@ import Data.Aeson.Lens (key, _String)
 import Data.Aeson.Types (parseEither)
 import Hydra.API.HTTPServer (DraftCommitTxResponse (DraftCommitTxResponse))
 import Hydra.Cardano.Api (Tx)
+import Hydra.JSONSchema (validateJSON, withJsonSpecifications)
 import Hydra.Ledger.Cardano.Configuration (pparamsFromJson)
 import Hydra.Logging (showLogsOnFailure)
 import System.Exit (ExitCode (..))
@@ -46,8 +47,14 @@ spec =
               Left e -> failure $ "Failed to decode JSON: " <> e <> "\n" <> show protocolParameters
               Right _ -> pure ()
 
-      it "query protocol-parameters matches our schema" $ \_tracer ->
-        pendingWith "TODO"
+      it "query protocol-parameters matches our schema" $ \tracer ->
+        withJsonSpecifications $ \tmpDir ->
+          withCardanoNodeDevnet tracer tmpDir $ \RunningNode{nodeSocket, networkId} -> do
+            pparamsValue <- cliQueryProtocolParameters nodeSocket (networkId)
+            validateJSON
+              (tmpDir </> "api.json")
+              (key "components" . key "schemas" . key "ProtocolParameters")
+              pparamsValue
  where
   cardanoCliSign txFile =
     proc
diff --git a/hydra-node/hydra-node.cabal b/hydra-node/hydra-node.cabal
index e5cb1f12148..6e852db9a6d 100644
--- a/hydra-node/hydra-node.cabal
+++ b/hydra-node/hydra-node.cabal
@@ -176,6 +176,28 @@ library
 
   ghc-options:     -haddock
 
+library testlib
+  import:          project-config
+  visibility:      public
+  hs-source-dirs:  testlib
+  exposed-modules: Hydra.JSONSchema
+  other-modules:   Paths_hydra_node
+  build-depends:
+    , aeson
+    , base
+    , containers
+    , directory
+    , filepath
+    , hydra-prelude
+    , hydra-test-utils
+    , lens
+    , lens-aeson
+    , process
+    , QuickCheck
+    , text
+    , versions
+    , yaml
+
 executable hydra-node
   import:         project-config
   hs-source-dirs: exe/hydra-node
@@ -274,7 +296,6 @@ test-suite tests
     Hydra.FireForgetSpec
     Hydra.HeadLogicSnapshotSpec
     Hydra.HeadLogicSpec
-    Hydra.JSONSchema
     Hydra.JSONSchemaSpec
     Hydra.Ledger.Cardano.TimeSpec
     Hydra.Ledger.CardanoSpec
@@ -331,7 +352,7 @@ test-suite tests
     , hspec-wai
     , HUnit
     , hydra-cardano-api
-    , hydra-node
+    , hydra-node:{hydra-node, testlib}
     , hydra-plutus
     , hydra-plutus-extras
     , hydra-prelude
@@ -342,7 +363,6 @@ test-suite tests
     , lens-aeson
     , plutus-ledger-api:{plutus-ledger-api, plutus-ledger-api-testlib}  >=1.1.1.0
     , plutus-tx
-    , process
     , QuickCheck
     , quickcheck-dynamic                                                >=3.3.1   && <3.4
     , quickcheck-instances
@@ -354,10 +374,7 @@ test-suite tests
     , time
     , typed-protocols-examples                                          >=0.1.0.0
     , vector
-    , versions
-    , wai-extra
     , websockets
-    , yaml
 
   build-tool-depends: hspec-discover:hspec-discover
   ghc-options:        -threaded -rtsopts
diff --git a/hydra-node/test/Hydra/JSONSchema.hs b/hydra-node/testlib/Hydra/JSONSchema.hs
similarity index 99%
rename from hydra-node/test/Hydra/JSONSchema.hs
rename to hydra-node/testlib/Hydra/JSONSchema.hs
index c6ffe6d3f23..bde2904cf3b 100644
--- a/hydra-node/test/Hydra/JSONSchema.hs
+++ b/hydra-node/testlib/Hydra/JSONSchema.hs
@@ -77,8 +77,7 @@ validateJSON schemaFilePath selector value = do
     when (exitCode /= ExitSuccess) $
       failure . toString $
         unlines
-          [ "check-jsonschema failed on " <> toText jsonInput <> " with schema " <> toText jsonSchema <> " on input:"
-          , decodeUtf8 $ encodePretty value
+          [ "check-jsonschema failed on " <> toText jsonInput <> " with schema " <> toText jsonSchema
           , toText err <> toText out
           ]
  where