hyparquet-writer/README.md

# Hyparquet Writer

[![workflow status](https://github.com/hyparam/hyparquet-writer/actions/workflows/ci.yml/badge.svg)](https://github.com/hyparam/hyparquet-writer/actions)
[![mit license](https://img.shields.io/badge/License-MIT-orange.svg)](https://opensource.org/licenses/MIT)
![coverage](https://img.shields.io/badge/Coverage-96-darkred)
[![dependencies](https://img.shields.io/badge/Dependencies-0-blueviolet)](https://www.npmjs.com/package/hyparquet?activeTab=dependencies)

## Usage

Call `parquetWrite` with a list of columns, each column is an object with a `name` and `data` field. The `data` field should be an array of same-type values.

```javascript
import { parquetWrite } from 'hyparquet-writer'

const arrayBuffer = parquetWrite([
  { name: 'name', data: ['Alice', 'Bob', 'Charlie'] },
  { name: 'age', data: [25, 30, 35] },
])
```

## References

 - https://github.com/hyparam/hyparquet
 - https://github.com/apache/parquet-format
 - https://github.com/apache/parquet-testing
Plain string support 2025-03-26 03:15:14 +00:00			`# Hyparquet Writer`

Handle byte array vs string, and change parquetWrite column api 2025-03-26 07:45:22 +00:00			`[![workflow status](https://github.com/hyparam/hyparquet-writer/actions/workflows/ci.yml/badge.svg)](https://github.com/hyparam/hyparquet-writer/actions)`
Plain string support 2025-03-26 03:15:14 +00:00			`[![mit license](https://img.shields.io/badge/License-MIT-orange.svg)](https://opensource.org/licenses/MIT)`
Support nullable columns 2025-03-26 05:36:06 +00:00			`![coverage](https://img.shields.io/badge/Coverage-96-darkred)`
Handle byte array vs string, and change parquetWrite column api 2025-03-26 07:45:22 +00:00			`[![dependencies](https://img.shields.io/badge/Dependencies-0-blueviolet)](https://www.npmjs.com/package/hyparquet?activeTab=dependencies)`
Support nullable columns 2025-03-26 05:36:06 +00:00
			`## Usage`

Handle byte array vs string, and change parquetWrite column api 2025-03-26 07:45:22 +00:00			Call `parquetWrite` with a list of columns, each column is an object with a `name` and `data` field. The `data` field should be an array of same-type values.

Support nullable columns 2025-03-26 05:36:06 +00:00			```javascript
Handle byte array vs string, and change parquetWrite column api 2025-03-26 07:45:22 +00:00			`import { parquetWrite } from 'hyparquet-writer'`
Support nullable columns 2025-03-26 05:36:06 +00:00
Handle byte array vs string, and change parquetWrite column api 2025-03-26 07:45:22 +00:00			`const arrayBuffer = parquetWrite([`
			`{ name: 'name', data: ['Alice', 'Bob', 'Charlie'] },`
			`{ name: 'age', data: [25, 30, 35] },`
			`])`
Support nullable columns 2025-03-26 05:36:06 +00:00			```

			`## References`

			`- https://github.com/hyparam/hyparquet`
			`- https://github.com/apache/parquet-format`
			`- https://github.com/apache/parquet-testing`