diff --git a/LICENSE b/LICENSE
index ccdcdde..7c20f89 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2019 Trevor Slocum <trevor@rocketnine.space>
+Copyright (c) 2020 Trevor Slocum <trevor@rocketnine.space>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/imgboard.php b/imgboard.php
index cfb21fb..d74f58d 100644
--- a/imgboard.php
+++ b/imgboard.php
@@ -1,7 +1,29 @@
 <?php
-# TinyIB
-#
-# https://gitlab.com/tslocum/tinyib
+/*
+TinyIB <https://gitlab.com/tslocum/tinyib>
+
+MIT License
+
+Copyright (c) 2020 Trevor Slocum <trevor@rocketnine.space>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
 
 error_reporting(E_ALL);
 ini_set("display_errors", 1);
@@ -57,6 +79,9 @@ foreach ($writedirs as $dir) {
 }
 
 $includes = array("inc/defines.php", "inc/functions.php", "inc/html.php");
+if (TINYIB_JSON) {
+	$includes[] = 'inc/json.php';
+}
 if (in_array(TINYIB_DBMODE, array('flatfile', 'mysql', 'mysqli', 'sqlite', 'sqlite3', 'pdo'))) {
 	$includes[] = 'inc/database_' . TINYIB_DBMODE . '.php';
 } else {
@@ -71,6 +96,8 @@ if (TINYIB_TIMEZONE != '') {
 	date_default_timezone_set(TINYIB_TIMEZONE);
 }
 
+writePage('threads.json', buildThreadsJSON());
+
 $redirect = true;
 // Check if the request is to make a post
 if (!isset($_GET['delete']) && !isset($_GET['manage']) && (isset($_POST['name']) || isset($_POST['email']) || isset($_POST['subject']) || isset($_POST['message']) || isset($_POST['file']) || isset($_POST['embed']) || isset($_POST['password']))) {
diff --git a/inc/defines.php b/inc/defines.php
index b4054c4..4087dfb 100644
--- a/inc/defines.php
+++ b/inc/defines.php
@@ -43,6 +43,9 @@ if (!defined('TINYIB_WORDBREAK')) {
 if (!defined('TINYIB_TIMEZONE')) {
 	define('TINYIB_TIMEZONE', '');
 }
+if (!defined('TINYIB_JSON')) {
+	define('TINYIB_JSON', true);
+}
 if (!defined('TINYIB_DBMIGRATE')) {
 	define('TINYIB_DBMIGRATE', false);
 }
diff --git a/inc/json.php b/inc/json.php
new file mode 100644
index 0000000..f25b9ae
--- /dev/null
+++ b/inc/json.php
@@ -0,0 +1,16 @@
+<?php
+
+function buildThreadsJSON() {
+	$output = '';
+
+	$threads = allThreads();
+	$pages = ceil(count($threads) / TINYIB_THREADSPERPAGE) - 1;
+
+	foreach ($threads as $thread) {
+		$replies = postsInThreadByID($thread['id']);
+
+		$output .= $thread['id'] . "\n";
+	}
+
+	return $output;
+}
\ No newline at end of file
diff --git a/settings.default.php b/settings.default.php
index fab294f..a6eae8f 100644
--- a/settings.default.php
+++ b/settings.default.php
@@ -27,6 +27,7 @@ define('TINYIB_PREVIEWREPLIES', 3);   // Amount of replies previewed on index pa
 define('TINYIB_TRUNCATE', 15);        // Messages are truncated to this many lines on board index pages  [0 to disable]
 define('TINYIB_WORDBREAK', 80);       // Words longer than this many characters will be broken apart  [0 to disable]
 define('TINYIB_TIMEZONE', 'UTC');     // See https://secure.php.net/manual/en/timezones.php - e.g. America/Los_Angeles
+define('TINYIB_JSON', true);          // Write JSON files (threads.json, catalog.json, etc.)
 $tinyib_hidefieldsop = array();       // Fields to hide when creating a new thread - e.g. array('name', 'email', 'subject', 'message', 'file', 'embed', 'password')
 $tinyib_hidefields = array();         // Fields to hide when replying