# dynamic-typing

> Dynamically type a string

Latest version **2.0.0** (published 2026-02-19) · MIT license · 0 weekly downloads

## Install

```sh
npm install dynamic-typing
pnpm add dynamic-typing
yarn add dynamic-typing
bun add dynamic-typing
```

## Health

**Score 50/100 (C)** — status: stable.

Positive: esm support; no vulnerabilities.

Warnings: low downloads; no types.

## Facts

| | |
|---|---|
| Version | 2.0.0 |
| Published | 2026-02-19 |
| First published | 2021-08-25 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | ESM |
| Dependencies | 0 |
| Unpacked size | 7 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 0 |
| Author | Luc Patiny |
| Maintainers | cheminfo-bot |

## Links

- npm: https://www.npmjs.com/package/dynamic-typing
- Repository: https://github.com/cheminfo/dynamic-typing
- Homepage: https://github.com/cheminfo/dynamic-typing#readme
- Issues: https://github.com/cheminfo/dynamic-typing/issues
- npm.io page: https://npm.io/package/dynamic-typing

## Recent versions

- 2.0.0 (latest) — 2026-02-19
- 1.0.1 — 2024-05-09
- 1.0.0 — 2022-08-22
- 0.1.3 — 2021-09-07
- 0.1.2 — 2021-08-26
- 0.1.1 — 2021-08-25
- 0.1.0 — 2021-08-25

## README

# dynamic-typing

[![NPM version][npm-image]][npm-url]
[![build status][ci-image]][ci-url]
[![Test coverage][codecov-image]][codecov-url]
[![npm download][download-image]][download-url]
[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.5482823.svg)](https://doi.org/10.5281/zenodo.5482823)

## Dynamically types a string.

When parsing text files, like the ones coming out fromm scientific instruments,
it is often useful to convert the obtained strings to their corresponding types.

Indeed when you parse the file while all the fields are text some of them represents in fact numbers or booleans.

This package will try to make the conversion for you using the following rules:

- a string that has as lowercase value 'true' or 'false' will be converted to the corresponding boolean
- a string that when converted to number (using `Number(string)`) does not yield to NaN will be converted to number
- other strings will be kept as string

This package was optimized for speed and seems to work pretty well. Please don't hesitate to submit bug reports or contribute.

## Installation

`$ npm i dynamic-typing`

## Usage

```js
import { parseString } from 'dynamic-typing';

const result = parseString('0x100');

// result is the number 256
```

More examples:

- `parseString('')` ➡ `''`
- `parseString(' ')` ➡ `' '`
- `parseString('.')` ➡ `'.'`
- `parseString('0.')` ➡ `0`
- `parseString('0.0')` ➡ `0`
- `parseString('abc')` ➡ `'abc'`
- `parseString('True')` ➡ `true`
- `parseString('false')` ➡ `false`
- `parseString('0')` ➡ `0`
- `parseString('123')` ➡ `123`
- `parseString('123.456')` ➡ `123.456`
- `parseString('12e3')` ➡ `12000`
- `parseString('0x10')` ➡ `16`
- `parseString('0b10')` ➡ `2`

## [API Documentation](https://cheminfo.github.io/dynamic-typing/)

## License

[MIT](./LICENSE)

[npm-image]: https://img.shields.io/npm/v/dynamic-typing.svg
[npm-url]: https://www.npmjs.com/package/dynamic-typing
[ci-image]: https://github.com/cheminfo/dynamic-typing/workflows/Node.js%20CI/badge.svg?branch=main
[ci-url]: https://github.com/cheminfo/dynamic-typing/actions?query=workflow%3A%22Node.js+CI%22
[codecov-image]: https://img.shields.io/codecov/c/github/cheminfo/dynamic-typing.svg
[codecov-url]: https://codecov.io/gh/cheminfo/dynamic-typing
[download-image]: https://img.shields.io/npm/dm/dynamic-typing.svg
[download-url]: https://www.npmjs.com/package/dynamic-typing

---
_Source: https://npm.io/package/dynamic-typing · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._