# Calculate the midpoint between two points

Average the x and y coordinates.

Canonical: https://1loc.dev/math/calculate-the-midpoint-between-two-points/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

```javascript
function midpoint({ p1, p2 }) { return [(p1.x + p2.x) / 2, (p1.y + p2.y) / 2]; }
```

## Input

```json
{
  "p1": {
    "x": 0,
    "y": 0
  },
  "p2": {
    "x": 4,
    "y": 6
  }
}
```

## Expected output

```json
[
  2,
  3
]
```

## Edge case

Input:
```json
{
  "p1": {
    "x": -2,
    "y": 1
  },
  "p2": {
    "x": 2,
    "y": 1
  }
}
```
Output:
```json
[
  0,
  1
]
```

## Limits

- Returns [x, y] as in the original.

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/calculate-the-midpoint-between-two-points.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: See original repository history
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Curated implementation; explicit input contract, edge case and limits. Original MDX retained as inert source evidence.