diff --git a/maintainers/maintainer-list.nix b/maintainers/maintainer-list.nix
index 9364636d1a6..46ed766e0cf 100644
--- a/maintainers/maintainer-list.nix
+++ b/maintainers/maintainer-list.nix
@@ -3536,6 +3536,12 @@
     githubId = 117874;
     name = "Jeroen de Haas";
   };
+  jduan = {
+    name = "Jingjing Duan";
+    email = "duanjingjing@gmail.com";
+    github = "jduan";
+    githubId = 452450;
+  };
   jefdaj = {
     email = "jefdaj@gmail.com";
     github = "jefdaj";
diff --git a/pkgs/tools/text/fastmod/default.nix b/pkgs/tools/text/fastmod/default.nix
new file mode 100644
index 00000000000..4ea24328b9c
--- /dev/null
+++ b/pkgs/tools/text/fastmod/default.nix
@@ -0,0 +1,29 @@
+{ stdenv
+, fetchFromGitHub
+, rustPlatform
+, Security
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "fastmod";
+  version = "0.4.0";
+
+  src = fetchFromGitHub {
+    owner = "facebookincubator";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "0089a17h0wgan3fs6x1la35lzjs1pib7p81wqkh3zcwvx8ffa8z8";
+  };
+
+  cargoSha256 = "02nkxjwfiljndmi0pv98chfsw9vmjzgmp5r14mchpayp4943qk9m";
+
+  buildInputs = stdenv.lib.optional stdenv.isDarwin Security;
+
+  meta = with stdenv.lib; {
+    description = "A utility that makes sweeping changes to large, shared code bases";
+    homepage = "https://github.com/facebookincubator/fastmod";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ jduan ];
+    platforms = platforms.all;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3f858168781..d293d0000b2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -955,6 +955,10 @@ in
 
   libfx2 = with python3Packages; toPythonApplication fx2;
 
+  fastmod = callPackage ../tools/text/fastmod {
+    inherit (darwin.apple_sdk.frameworks) Security;
+  };
+
   fitnesstrax = callPackage ../applications/misc/fitnesstrax/default.nix { };
 
   fxlinuxprintutil = callPackage ../tools/misc/fxlinuxprintutil { };