From b49cbbd3777ecab8f10adbc953f3ba397c700c2e Mon Sep 17 00:00:00 2001
From: Harvmaster <hzuccon@gmail.com>
Date: Mon, 20 Jul 2026 05:31:54 +0000
Subject: [PATCH] Add toExtendedJson and fromExtendedJson helper functions

---
 source/extended-json.ts    | 20 ++++++++++++++++++++
 test/extended-json.test.ts | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/source/extended-json.ts b/source/extended-json.ts
index ea77d41..9b4d06c 100644
--- a/source/extended-json.ts
+++ b/source/extended-json.ts
@@ -74,3 +74,23 @@ export const extendedJsonReviver = (_propertyKey: string, value: unknown): unkno
     // If the value does not match either pattern, return the original value
     return value;
 };
+
+/**
+ * Serializes an object to a string using the {@link extendedJsonReplacer}.
+ *
+ * @param object The object to serialize.
+ * @returns The string representation of the object in Extended JSON format.
+ */
+export const toExtendedJson = (object: unknown): string => {
+    return JSON.stringify(object, extendedJsonReplacer);
+};
+
+/**
+ * Deserializes a string to an object using the {@link extendedJsonReviver}.
+ *
+ * @param serializedObject The string to deserialize.
+ * @returns The object reconstructed from the string.
+ */
+export const fromExtendedJson = (serializedObject: string): unknown => {
+    return JSON.parse(serializedObject, extendedJsonReviver);
+};
diff --git a/test/extended-json.test.ts b/test/extended-json.test.ts
index 22032c6..13705e9 100644
--- a/test/extended-json.test.ts
+++ b/test/extended-json.test.ts
@@ -1,5 +1,5 @@
 import { expect, test } from 'vitest';
-import { extendedJsonReviver } from '../source/index.ts';
+import { extendedJsonReviver, toExtendedJson, fromExtendedJson } from '../source/index.ts';
 
 /**
  * Tests that extendedJsonReviver reconstructs a positive bigint.
@@ -64,6 +64,34 @@ const testReviverPassesThroughPlainString = (): void => {
     expect(reconstructed).toBe('just a string');
 };
 
+/**
+ * Tests that toExtendedJson serializes an object to a string.
+ */
+const testToExtendedJsonSerializesObject = (): void => {
+    // Define an object with a Uint8Array
+    const extendedObject = { bytes: new Uint8Array([ 0xab, 0xcd ]) };
+
+    // Serialize the object to a string
+    const serialized = toExtendedJson(extendedObject);
+
+    // The serialized string should contain the Uint8Array in Extended JSON format (Uint8Arrays are encoded as hex strings)
+    expect(serialized).toBe('{"bytes":"<uint8array: abcd>"}');
+};
+
+/**
+ * Tests that fromExtendedJson deserializes a string to an object.
+ */
+const testFromExtendedJsonDeserializesString = (): void => {
+    // Define a string in Extended JSON format that contains a Uint8Array
+    const serializedObject = '{"bytes":"<uint8array: abcd>"}';
+
+    // Deserialize the string to an object
+    const deserialized = fromExtendedJson(serializedObject);
+
+    // The deserialized object should contain the Uint8Array
+    expect(deserialized).toStrictEqual({ bytes: new Uint8Array([ 0xab, 0xcd ]) });
+};
+
 /**
  * Tests that extendedJsonReviver passes through non-string values.
  */
@@ -85,6 +113,8 @@ const runTests = async (): Promise<void> => {
     test('extendedJsonReviver: reconstructs an empty Uint8Array', testReviverReconstructsEmptyUint8Array);
     test('extendedJsonReviver: passes through plain strings', testReviverPassesThroughPlainString);
     test('extendedJsonReviver: passes through non-string values', testReviverPassesThroughNonStringValues);
+    test('toExtendedJson: serializes an object to a string', testToExtendedJsonSerializesObject);
+    test('fromExtendedJson: deserializes a string to an object', testFromExtendedJsonDeserializesString);
 };
 
 await runTests();