From 290672d7b4b3c454f02a42d95df3ddfae307542f Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Wed, 15 Oct 2025 00:15:31 +0200
Subject: Use nlohmann for JSON.

---
 src/lib/http_server.cc | 12 ++++++------
 src/lib/wscript        |  2 +-
 wscript                |  8 ++++++++
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/src/lib/http_server.cc b/src/lib/http_server.cc
index 3dab26d1e..294d350ac 100644
--- a/src/lib/http_server.cc
+++ b/src/lib/http_server.cc
@@ -25,6 +25,7 @@
 #include "http_server.h"
 #include "util.h"
 #include "variant.h"
+#include <nlohmann/json.hpp>
 #include <boost/algorithm/string.hpp>
 #include <stdexcept>
 
@@ -96,15 +97,14 @@ HTTPServer::get(string const& url)
 	if (url == "/") {
 		return Response(200, fmt::format(dcp::file_to_string(resources_path() / "web" / "index.html"), variant::dcpomatic_player()));
 	} else if (url == "/api/v1/status") {
-		auto json = string{"{ "};
+		nlohmann::json json;
 		{
 			boost::mutex::scoped_lock lm(_mutex);
-			json += fmt::format("\"playing\": {}, ", _playing ? "true" : "false");
-			json += fmt::format("\"position\": \"{}\", ", seconds_to_hms(_position.seconds()));
-			json += fmt::format("\"dcp_name\": \"{}\"", _dcp_name);
+			json["playing"] = _playing;
+			json["position"] = seconds_to_hms(_position.seconds());
+			json["dcp_name"] = _dcp_name;
 		}
-		json += " }";
-		auto response = Response(200, json);
+		auto response = Response(200, json.dump());
 		response.set_type(Response::Type::JSON);
 		return response;
 	} else {
diff --git a/src/lib/wscript b/src/lib/wscript
index 3489aab7b..4478c2587 100644
--- a/src/lib/wscript
+++ b/src/lib/wscript
@@ -258,7 +258,7 @@ def build(bld):
                  BOOST_FILESYSTEM BOOST_THREAD BOOST_DATETIME BOOST_SIGNALS2 BOOST_REGEX
                  SAMPLERATE POSTPROC TIFF SSH DCP CXML GLIB LZMA XML++
                  CURL ZIP BZ2 FONTCONFIG PANGOMM CAIROMM XMLSEC SUB ICU NETTLE PNG JPEG LEQM_NRT
-                 LIBZ SQLITE3
+                 LIBZ SQLITE3 JSON
                  """
 
     if bld.env.TARGET_OSX:
diff --git a/wscript b/wscript
index 1b2e83dac..e4925366c 100644
--- a/wscript
+++ b/wscript
@@ -697,6 +697,14 @@ def configure(conf):
                    define_name="DCPOMATIC_HAVE_SQLITE3_PREPARE_V3",
                    mandatory=False)
 
+    conf.check_cxx(fragment="""
+                       #include <nlohmann/json.hpp>
+                       int main() { nlohmann::json json; return 0; }
+                       """,
+                   msg='Checking for nlohmann json',
+                   uselib='JSON',
+                   mandatory=True)
+
 
     # Other stuff
 
-- 
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