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diff --git a/sourcemod/scripting/include/json/helpers/string.inc b/sourcemod/scripting/include/json/helpers/string.inc
new file mode 100644
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+++ b/sourcemod/scripting/include/json/helpers/string.inc
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+/**
+ * vim: set ts=4 :
+ * =============================================================================
+ * sm-json
+ * Provides a pure SourcePawn implementation of JSON encoding and decoding.
+ * https://github.com/clugg/sm-json
+ *
+ * sm-json (C)2019 James Dickens. (clug)
+ * SourceMod (C)2004-2008 AlliedModders LLC.  All rights reserved.
+ * =============================================================================
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, version 3.0, as published by the
+ * Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, AlliedModders LLC gives you permission to link the
+ * code of this program (as well as its derivative works) to "Half-Life 2," the
+ * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
+ * by the Valve Corporation.  You must obey the GNU General Public License in
+ * all respects for all other code used.  Additionally, AlliedModders LLC grants
+ * this exception to all derivative works.  AlliedModders LLC defines further
+ * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
+ * or <http://www.sourcemod.net/license.php>.
+ */
+
+#if defined _json_helpers_string_included
+ #endinput
+#endif
+#define _json_helpers_string_included
+
+/**
+ * Mapping characters to their escaped form.
+ */
+char JSON_STRING_NORMAL[][]  = {
+    "\\",   "\"",   "/",   "\b",  "\f",  "\n",  "\r",  "\t"
+};
+char JSON_STRING_ESCAPED[][] = {
+    "\\\\", "\\\"", "\\/", "\\b", "\\f", "\\n", "\\r", "\\t"
+};
+
+/**
+ * Escapes a string in-place in a buffer.
+ *
+ * @param buffer    String buffer.
+ * @param max_size  Maximum size of string buffer.
+ */
+stock void json_escape_string(char[] buffer, int max_size)
+{
+    for (int i = 0; i < sizeof(JSON_STRING_NORMAL); ++i) {
+        ReplaceString(
+            buffer,
+            max_size,
+            JSON_STRING_NORMAL[i],
+            JSON_STRING_ESCAPED[i]
+        );
+    }
+}
+
+/**
+ * Unescapes a string in-place in a buffer.
+ *
+ * @param buffer    String buffer.
+ * @param max_size  Maximum size of string buffer.
+ */
+stock void json_unescape_string(char[] buffer, int max_size)
+{
+    for (int i = 0; i < sizeof(JSON_STRING_NORMAL); ++i) {
+        ReplaceString(
+            buffer,
+            max_size,
+            JSON_STRING_ESCAPED[i],
+            JSON_STRING_NORMAL[i]
+        );
+    }
+}
+
+/**
+ * Checks if a string starts with another string.
+ *
+ * @param haystack  String to check that starts with needle.
+ * @param max_size  Maximum size of string buffer.
+ * @param needle    String to check that haystack starts with.
+ * @returns         True if haystack begins with needle, false otherwise.
+ */
+stock bool json_string_startswith(const char[] haystack, const char[] needle)
+{
+    int haystack_length = strlen(haystack);
+    int needle_length = strlen(needle);
+    if (needle_length > haystack_length) {
+        return false;
+    }
+
+    for (int i = 0; i < needle_length; ++i) {
+        if (haystack[i] != needle[i]) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+/**
+ * Checks if a string ends with another string.
+ *
+ * @param haystack  String to check that ends with needle.
+ * @param max_size  Maximum size of string buffer.
+ * @param needle    String to check that haystack ends with.
+ * @returns         True if haystack ends with needle, false otherwise.
+ */
+stock bool json_string_endswith(const char[] haystack, const char[] needle)
+{
+    int haystack_length = strlen(haystack);
+    int needle_length = strlen(needle);
+    if (needle_length > haystack_length) {
+        return false;
+    }
+
+    for (int i = 0; i < needle_length; ++i) {
+        if (haystack[haystack_length - needle_length + i] != needle[i]) {
+            return false;
+        }
+    }
+
+    return true;
+}