diff --git a/.changeset/hot-pumas-destroy.md b/.changeset/hot-pumas-destroy.md
new file mode 100644
index 00000000..cb05cfe4
--- /dev/null
+++ b/.changeset/hot-pumas-destroy.md
@@ -0,0 +1,5 @@
+---
+'@hono/effect-validator': minor
+---
+
+format errors with array formatting for improved readability
diff --git a/packages/effect-validator/src/index.ts b/packages/effect-validator/src/index.ts
index 0b670061..e1eda41c 100644
--- a/packages/effect-validator/src/index.ts
+++ b/packages/effect-validator/src/index.ts
@@ -1,3 +1,4 @@
+import { ArrayFormatter } from '@effect/schema'
 import * as S from '@effect/schema/Schema'
 import { Either } from 'effect'
 import type { Env, Input, MiddlewareHandler, ValidationTargets } from 'hono'
@@ -45,7 +46,8 @@ export const effectValidator = <
     const result = S.decodeUnknownEither(schema)(value)
 
     return Either.match(result, {
-      onLeft: (error) => c.json({ success: false, error: JSON.parse(JSON.stringify(error)) }, 400),
+      onLeft: (error) =>
+        c.json({ success: false, error: ArrayFormatter.formatErrorSync(error) }, 400),
       onRight: (data) => {
         c.req.addValidatedData(target, data as object)
         return data
diff --git a/packages/effect-validator/test/index.test.ts b/packages/effect-validator/test/index.test.ts
index fa7212c1..185fc725 100644
--- a/packages/effect-validator/test/index.test.ts
+++ b/packages/effect-validator/test/index.test.ts
@@ -1,3 +1,4 @@
+import type { ArrayFormatter } from '@effect/schema'
 import { Schema as S } from '@effect/schema'
 import { Hono } from 'hono'
 import type { StatusCode } from 'hono/utils/http-status'
@@ -103,8 +104,10 @@ describe('Basic', () => {
     expect(res).not.toBeNull()
     expect(res.status).toBe(400)
 
-    const data = (await res.json()) as { success: boolean }
+    const data = await res.json<{ success: boolean; error: ArrayFormatter.Issue[] }>()
     expect(data.success).toBe(false)
+    expect(data.error[0].path).toEqual(['age'])
+    expect(data.error[0].message).toBeDefined()
   })
 })