diff --git a/games/devtest/mods/testeditor/init.lua b/games/devtest/mods/testeditor/init.lua
new file mode 100644
index 000000000..d2097a8b4
--- /dev/null
+++ b/games/devtest/mods/testeditor/init.lua
@@ -0,0 +1,280 @@
+local S = core.get_translator("testeditor")
+local F = core.formspec_escape
+
+local function val_to_lua_str(v)
+	if type(v) == "string" then
+		return "\"" .. v .. "\""
+	elseif type(v) == "table" then
+		return tostring(dump(v)):gsub("\n", "")
+	else
+		return tostring(v)
+	end
+end
+
+local editor_formspecs = {}
+
+--- Updates the fields `.index_to_key` and `.list` based on `.data`
+local function update_formspec_list(formspec)
+	assert(formspec)
+
+	-- Get sorted keys of the formspec fields in `formspec.data`
+	local datalist = {}
+	for k,_ in pairs(formspec.data) do
+		table.insert(datalist, k)
+	end
+	table.sort(datalist)
+
+	-- Build list of table values
+	local props = {}
+	for i, k in ipairs(datalist) do
+		local v = formspec.data[k]
+		props[#props + 1] = F(("%s = %s"):format(k, val_to_lua_str(v)))
+	end
+
+	formspec.index_to_key = datalist
+	formspec.list = table.concat(props, ",")
+end
+
+local function show_editor_formspec(playername)
+	local formspec = editor_formspecs[playername]
+	local sel = formspec.selindex or ""
+	local key = formspec.index_to_key[sel]
+	local value = ""
+	if formspec.data[key] ~= nil then
+		value = val_to_lua_str(formspec.data[key])
+	end
+	local title = formspec.title
+	if not formspec.actual then
+		title = S("@1 - NOT APPLIED CHANGES", title)
+	end
+	core.show_formspec(playername, "testeditor:editor",
+		"size[11,9]"..
+		"label[0,0;"..F(title).."]"..
+		"textlist[0,0.5;11,6.5;editor_data;"..formspec.list..";"..sel..";false]"..
+		"field[0.2,7.75;7,1;key;"..F(S("Key"))..";"..F(formspec.key).."]"..
+		"field_close_on_enter[key;false]"..
+		"field[0.2,8.75;8,1;value;"..F(S("Value"))..";"..F(value).."]"..
+		"button[8,7.5;3,1;submit_key;"..F(S("Add/Change key")).."]"..
+		"field_close_on_enter[value;false]"..
+		"button[8,8.5;3,1;submit_value;"..F(S("Submit and apply")).."]"
+	)
+end
+
+local function editor_formspec_create(playername, wrapper)
+	local data = wrapper.read_cb(playername)
+	editor_formspecs[playername] = {
+		title = wrapper.title,
+		read_cb = wrapper.read_cb,
+		write_cb = wrapper.write_cb,
+		data = data,
+		key = "",
+		actual = true,
+	}
+	update_formspec_list(editor_formspecs[playername])
+	show_editor_formspec(playername)
+end
+
+-- Use loadstring to parse param as a Lua value
+local function use_loadstring(param, player)
+	-- For security reasons, require 'server' priv, just in case
+	-- someone is actually crazy enough to run this on a public server.
+	local privs = core.get_player_privs(player:get_player_name())
+	if not privs.server then
+		return false, "You need 'server' privilege to change object properties!"
+	end
+	if not param then
+		return false, "Failed: parameter is nil"
+	end
+	--[[ DANGER ZONE ]]
+	-- Interpret string as Lua value
+	local func, errormsg = loadstring("return (" .. param .. ")")
+	if not func then
+		return false, "loadstring failed: " .. errormsg
+	end
+
+	-- Apply sandbox here using setfenv
+	setfenv(func, {})
+
+	-- Run it
+	local good, errOrResult = pcall(func)
+	if not good then
+		-- A Lua error was thrown
+		return false, "pcall failed: " .. errOrResult
+	end
+
+	-- errOrResult will be the value
+	return true, errOrResult
+end
+
+core.register_on_player_receive_fields(function(player, formname, fields)
+	if not (player and player:is_player()) then
+		return
+	end
+	if formname ~= "testeditor:editor" then
+		return
+	end
+
+	local name = player:get_player_name()
+	local formspec = editor_formspecs[name]
+	if not formspec then
+		return
+	end
+
+	if fields.editor_data then
+		local expl = core.explode_textlist_event(fields.editor_data)
+		if expl.type == "DCL" or expl.type == "CHG" then
+			formspec.selindex = expl.index
+			formspec.key = formspec.index_to_key[expl.index]
+			show_editor_formspec(name)
+			return
+		end
+	end
+	if fields.key_enter_field == "key" or fields.submit_key then
+		local success, str = use_loadstring(fields.value, player)
+		if success then
+			local key = fields.key
+			formspec.data[key] = str
+			update_formspec_list(formspec)
+			formspec.actual = false
+		else
+			core.chat_send_player(name, str)
+			return
+		end
+		show_editor_formspec(name)
+		if fields.submit_value then
+			formspec.write_cb(name, formspec.data)
+		end
+		return
+	end
+	if fields.key_enter_field == "value" or fields.submit_value then
+		local success, str = use_loadstring(fields.value, player)
+		if success then
+			local key = formspec.index_to_key[formspec.selindex]
+			formspec.data[key] = str
+			update_formspec_list(formspec)
+			formspec.actual = false
+		else
+			core.chat_send_player(name, str)
+			return
+		end
+		show_editor_formspec(name)
+		if fields.submit_value then
+			formspec.write_cb(name, formspec.data)
+			formspec.data = formspec.read_cb(name)
+			update_formspec_list(formspec)
+			formspec.actual = true
+		end
+		return
+	end
+end)
+
+local function create_read_cb(func)
+	return
+		function(name)
+			local player = core.get_player_by_name(name)
+			if player then
+				return player[func](player)
+			end
+			return {}
+		end
+end
+local function create_write_cb(func)
+	return
+		function(name, data)
+			local player = core.get_player_by_name(name)
+			if player then
+				return player[func](player, data)
+			end
+		end
+end
+
+local wrappers = {
+	armor = {
+		title = S("Properties editor of armor groups (get_armor_groups/set_armor_groups)"),
+		read_cb = create_read_cb("get_armor_groups"),
+		write_cb = create_write_cb("set_armor_groups")
+	},
+	nametag = {
+		title = S("Properties editor of nametag (get_nametag/set_nametag)"),
+		read_cb = create_read_cb("get_nametag_attributes"),
+		write_cb = create_write_cb("set_nametag_attributes")
+	},
+	physics = {
+		title = S("Properties editor of physics_override (get_physics_override/set_physics_override)"),
+		read_cb = create_read_cb("get_physics_override"),
+		write_cb = create_write_cb("set_physics_override")
+	},
+	hud_flags = {
+		title = S("Properties editor of hud_flags (hud_get_flags/hud_set_flags)"),
+		read_cb = create_read_cb("hud_get_flags"),
+		write_cb = create_write_cb("hud_set_flags")
+	},
+	sky = {
+		title = S("Properties editor of sky (get_sky/set_sky)"),
+		read_cb =
+			function(name)
+				local player = core.get_player_by_name(name)
+				if player then
+					return player:get_sky(true)
+				end
+				return {}
+			end,
+		write_cb = create_write_cb("set_sky")
+	},
+	sun = {
+		title = S("Properties editor of sun (get_sun/set_sun)"),
+		read_cb = create_read_cb("get_sun"),
+		write_cb = create_write_cb("set_sun")
+	},
+	moon = {
+		title = S("Properties editor of moon (get_moon/set_moon)"),
+		read_cb = create_read_cb("get_moon"),
+		write_cb = create_write_cb("set_moon")
+	},
+	stars = {
+		title = S("Properties editor of stars (get_stars/set_stars)"),
+		read_cb = create_read_cb("get_stars"),
+		write_cb = create_write_cb("set_stars")
+	},
+	clouds = {
+		title = S("Properties editor of clouds (get_clouds/set_clouds)"),
+		read_cb = create_read_cb("get_clouds"),
+		write_cb = create_write_cb("set_clouds")
+	},
+	lighting = {
+		title = S("Properties editor of lighting (get_lighting/set_lighting)"),
+		read_cb = create_read_cb("get_lighting"),
+		write_cb = create_write_cb("set_lighting")
+	},
+	flags = {
+		title = S("Properties editor of flags (get_flags/set_flags)"),
+		read_cb = create_read_cb("get_flags"),
+		write_cb = create_write_cb("set_flags")
+	}
+}
+
+local editor_params
+do
+	local params = {}
+	for key, _ in pairs(wrappers) do
+		params[#params + 1] = key
+	end
+	editor_params = table.concat(params, "|")
+end
+
+core.register_chatcommand("player_editor", {
+	params = "<"..editor_params..">",
+	description = "Open editor for some player data",
+	func = function(name, param)
+		local player = core.get_player_by_name(name)
+		if not player then
+			return false, "No player."
+		end
+		if wrappers[param] then
+			editor_formspec_create(name, wrappers[param])
+		else
+			return false, S("Use with @1.", editor_params)
+		end
+		return true
+	end,
+})
diff --git a/games/devtest/mods/testeditor/mod.conf b/games/devtest/mods/testeditor/mod.conf
new file mode 100644
index 000000000..a7e724055
--- /dev/null
+++ b/games/devtest/mods/testeditor/mod.conf
@@ -0,0 +1,2 @@
+name = testeditor
+description = Commands for create formspec for edit some things like sky etc.
diff --git a/src/unittest/test_servermodmanager.cpp b/src/unittest/test_servermodmanager.cpp
index 5689658d9..01bb70c2f 100644
--- a/src/unittest/test_servermodmanager.cpp
+++ b/src/unittest/test_servermodmanager.cpp
@@ -111,7 +111,7 @@ void TestServerModManager::testGetMods()
 	auto sm = makeManager(m_worlddir);
 	const auto &mods = sm.getMods();
 	// `ls ./games/devtest/mods | wc -l` + 1 (test mod)
-	UASSERTEQ(std::size_t, mods.size(), 34 + 1);
+	UASSERTEQ(std::size_t, mods.size(), 35 + 1);
 
 	// Ensure we found basenodes mod (part of devtest)
 	// and test_mod (for testing MINETEST_MOD_PATH).