From 75c88ebffe2a13f92a832e704c8cde20bfdc41da Mon Sep 17 00:00:00 2001
From: Julien Girard-Satabin <julien.girard2@cea.fr>
Date: Tue, 27 May 2025 10:56:54 +0200
Subject: [PATCH] melange-json: init at version 2.0.0

---
 .../ocaml-modules/melange-json/default.nix    | 32 +++++++++++++++++++
 pkgs/top-level/ocaml-packages.nix             |  2 ++
 2 files changed, 34 insertions(+)
 create mode 100644 pkgs/development/ocaml-modules/melange-json/default.nix

diff --git a/pkgs/development/ocaml-modules/melange-json/default.nix b/pkgs/development/ocaml-modules/melange-json/default.nix
new file mode 100644
index 000000000000..69b2e7004ab5
--- /dev/null
+++ b/pkgs/development/ocaml-modules/melange-json/default.nix
@@ -0,0 +1,32 @@
+{
+  lib,
+  fetchFromGitHub,
+  buildDunePackage,
+  yojson,
+  melange,
+  ppxlib,
+}:
+
+buildDunePackage rec {
+  pname = "melange-json";
+  version = "2.0.0";
+  src = fetchFromGitHub {
+    owner = "melange-community";
+    repo = "melange-json";
+    tag = version;
+    hash = "sha256-vgcvPRc2vEHE1AtHyttvs1T0LcoeTOFfmPUCz95goT0=";
+  };
+
+  nativeBuildInputs = [ melange ];
+  buildInputs = [
+    melange
+    yojson
+    ppxlib
+  ];
+  meta = {
+    description = "Compositional JSON encode/decode library and PPX for Melange and OCaml";
+    homepage = "https://github.com/melange-community/melange-json";
+    license = lib.licenses.lgpl3;
+    maintainers = [ lib.maintainers.GirardR1006 ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index e9bee00dcd49..50cf99950878 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -1194,6 +1194,8 @@ let
 
         melange = callPackage ../development/tools/ocaml/melange { };
 
+        melange-json = callPackage ../development/ocaml-modules/melange-json { };
+
         memprof-limits = callPackage ../development/ocaml-modules/memprof-limits { };
 
         memtrace = callPackage ../development/ocaml-modules/memtrace { };