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diff --git a/js/public/JSON.h b/js/public/JSON.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/*
+ * JSON serialization and deserialization operations.
+ */
+
+#ifndef js_JSON_h
+#define js_JSON_h
+
+#include <stdint.h>  // uint32_t
+
+#include "jstypes.h"  // JS_PUBLIC_API
+
+#include "js/TypeDecls.h"
+
+using JSONWriteCallback = bool (*)(const char16_t* buf, uint32_t len,
+                                   void* data);
+
+/**
+ * Performs the JSON.stringify operation, as specified by ECMAScript, except
+ * writing stringified data by repeated calls of |callback|, with each such
+ * call passed |data| as argument.
+ */
+extern JS_PUBLIC_API bool JS_Stringify(JSContext* cx,
+                                       JS::MutableHandle<JS::Value> value,
+                                       JS::Handle<JSObject*> replacer,
+                                       JS::Handle<JS::Value> space,
+                                       JSONWriteCallback callback, void* data);
+
+namespace JS {
+
+/**
+ * An API akin to JS_Stringify but with the goal of not having observable
+ * side-effects when the stringification is performed.  This means it does not
+ * allow a replacer or a custom space and has the following constraints on its
+ * input:
+ *
+ * 1) The input must be a plain object or array, not an abitrary value.
+ * 2) Every value in the graph reached by the algorithm starting with this
+ *    object must be one of the following: null, undefined, a string (NOT a
+ *    string object!), a boolean, a finite number (i.e. no NaN or Infinity or
+ *    -Infinity), a plain object with no accessor properties, or an Array with
+ *    no holes.
+ *
+ * The actual behavior differs from JS_Stringify only in asserting the above and
+ * NOT attempting to get the "toJSON" property from things, since that could
+ * clearly have side-effects.
+ */
+extern JS_PUBLIC_API bool ToJSONMaybeSafely(JSContext* cx,
+                                            JS::Handle<JSObject*> input,
+                                            JSONWriteCallback callback,
+                                            void* data);
+
+} /* namespace JS */
+
+/**
+ * Performs the JSON.parse operation as specified by ECMAScript.
+ */
+extern JS_PUBLIC_API bool JS_ParseJSON(JSContext* cx, const char16_t* chars,
+                                       uint32_t len,
+                                       JS::MutableHandle<JS::Value> vp);
+
+/**
+ * Performs the JSON.parse operation as specified by ECMAScript.
+ */
+extern JS_PUBLIC_API bool JS_ParseJSON(JSContext* cx, JS::Handle<JSString*> str,
+                                       JS::MutableHandle<JS::Value> vp);
+
+/**
+ * Performs the JSON.parse operation as specified by ECMAScript, using the
+ * given |reviver| argument as the corresponding optional argument to that
+ * function.
+ */
+extern JS_PUBLIC_API bool JS_ParseJSONWithReviver(
+    JSContext* cx, const char16_t* chars, uint32_t len,
+    JS::Handle<JS::Value> reviver, JS::MutableHandle<JS::Value> vp);
+
+/**
+ * Performs the JSON.parse operation as specified by ECMAScript, using the
+ * given |reviver| argument as the corresponding optional argument to that
+ * function.
+ */
+extern JS_PUBLIC_API bool JS_ParseJSONWithReviver(
+    JSContext* cx, JS::Handle<JSString*> str, JS::Handle<JS::Value> reviver,
+    JS::MutableHandle<JS::Value> vp);
+
+#endif /* js_JSON_h */