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diff --git a/js/src/builtin/JSON.h b/js/src/builtin/JSON.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef builtin_JSON_h
+#define builtin_JSON_h
+
+#include "mozilla/Range.h"
+
+#include "NamespaceImports.h"
+
+#include "js/RootingAPI.h"
+
+namespace js {
+
+class StringBuffer;
+
+extern const JSClass JSONClass;
+
+enum class StringifyBehavior {
+  // Attempt an optimistic fast path if possible, bailing back to the slow path
+  // if anything is encountered that could invalidate the fast path results per
+  // spec. Default behavior for non-DEBUG builds.
+  Normal,
+
+  // Handle a subset of functionality when called by JS::ToJSONMaybeSafely.
+  // Different restrictions than the fast path described for Normal. See the
+  // Stringify() comment below for details.
+  RestrictedSafe,
+
+  // If the fast path fails, throw an exception instead of falling back to the
+  // slow path. Useful for testing that something that should be handled by the
+  // fast path actually is.
+  FastOnly,
+
+  // Do not attempt the fast path. Useful for timing comparisons.
+  SlowOnly,
+
+  // Attempt to run both the fast and slow paths and compare the results,
+  // crashing on any discrepancy. For correctness testing only. Default behavior
+  // when DEBUG is defined.
+  Compare
+};
+
+/**
+ * If stringifyBehavior is RestrictedSafe, Stringify will attempt to assert the
+ * API requirements of JS::ToJSONMaybeSafely as it traverses the graph, and will
+ * not try to invoke .toJSON on things as it goes.
+ */
+extern bool Stringify(JSContext* cx, js::MutableHandleValue vp,
+                      JSObject* replacer, const Value& space, StringBuffer& sb,
+                      StringifyBehavior stringifyBehavior);
+
+template <typename CharT>
+extern bool ParseJSONWithReviver(JSContext* cx,
+                                 const mozilla::Range<const CharT> chars,
+                                 HandleValue reviver, MutableHandleValue vp);
+
+}  // namespace js
+
+#endif /* builtin_JSON_h */