# Check if multiple objects are equal

Compare JSON serializations with the first object.

Canonical: https://1loc.dev/object/check-if-multiple-objects-are-equal/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function areEqual(objects) { return objects.every(object => JSON.stringify(object) === JSON.stringify(objects[0])); }
```

## Input

```json
[
  {
    "a": 1
  },
  {
    "a": 1
  },
  {
    "a": 1
  }
]
```

## Expected output

```json
true
```

## Edge case

Input:
```json
[
  {
    "a": 1,
    "b": 2
  },
  {
    "b": 2,
    "a": 1
  }
]
```
Output:
```json
false
```

## Limits

- Key order matters to JSON.stringify, as the edge case shows; undefined values and functions are dropped. Use a deep-equality library for robust comparison.

The lab validates types and size before calling this function. Add equivalent validation at your own trust boundary.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/check-if-multiple-objects-are-equal.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: tugsanunlu
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Takes one array of objects instead of rest arguments. Original MDX retained as inert source evidence.