diff --git a/src/index.js b/src/index.js
index d98713b..d9910f0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,6 +4,19 @@ export class AssertionError extends Error {
     }
 }
 
+/**
+ * @template T
+ * @param {T} obj
+ * @returns {obj is Exclude<T, Function|symbol|bigint|string|number|boolean|undefined|null|RegExp|Date|Map|Set>}
+ */
+function isObject(obj) {
+    return (
+        obj !== null &&
+        typeof obj === 'object' &&
+        [null, Object.prototype].includes(Object.getPrototypeOf(obj))
+    )
+}
+
 export const assert = (value, message = `assertion error: ${value} is not true`) => {
     assertEq(value, true, message)
 }
@@ -11,10 +24,10 @@ export const assert = (value, message = `assertion error: ${value} is not true`)
 export const assertEq = (a, b, message = `assertion error: ${a} !== ${b}`) => {
     if (a === b) {
         return
-    }
-    else if (Array.isArray(b) && a.length === b.length) {
-        b.forEach((n, i) => assertEq(a[i], n))
-        return
+    } else if (Array.isArray(b) && a.length === b.length) {
+        b.forEach((n, i) => assertEq(a[i], n, message))
+    } else if (isObject(b) && isObject(a)) {
+        assertEq(JSON.stringify(a), JSON.stringify(b), message)
     } else {
         throw new AssertionError(message)
     }