https://github.com/stdlib-js/utils-capitalize-keys
Convert the first letter of each object key to uppercase.
https://github.com/stdlib-js/utils-capitalize-keys
capitalize clone copy cp extract first javascript map node node-js nodejs property props stdlib transform uppercase util utilities utility utils
Last synced: 6 months ago
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Convert the first letter of each object key to uppercase.
- Host: GitHub
- URL: https://github.com/stdlib-js/utils-capitalize-keys
- Owner: stdlib-js
- License: apache-2.0
- Created: 2021-06-13T19:29:52.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2025-03-17T00:58:24.000Z (7 months ago)
- Last Synced: 2025-04-12T17:51:39.752Z (6 months ago)
- Topics: capitalize, clone, copy, cp, extract, first, javascript, map, node, node-js, nodejs, property, props, stdlib, transform, uppercase, util, utilities, utility, utils
- Language: JavaScript
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 698 KB
- Stars: 2
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
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README
About stdlib...
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# capitalizeKeys
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Convert the first letter of each object key to uppercase.
## Installation
```bash
npm install @stdlib/utils-capitalize-keys
```
Alternatively,
- To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).
- If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).
- For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).
The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
## Usage
```javascript
var capitalizeKeys = require( '@stdlib/utils-capitalize-keys' );
```
#### capitalizeKeys( obj )
Converts the first letter of each `object` key to uppercase, mapping the transformed keys to a new `object` having the same values.
```javascript
var obj1 = {
'beepBoop': 1,
'fooBar': 2
};
var obj2 = capitalizeKeys( obj1 );
// returns { 'BeepBoop': 1, 'FooBar': 2 }
```
## Notes
- The function only transforms **own** properties. Hence, the function does **not** transform inherited properties.
- The function **shallow** copies key values.
## Examples
```javascript
var capitalizeKeys = require( '@stdlib/utils-capitalize-keys' );
var obj1 = {
'aa': 'beep',
'bb': 'boop',
'cc': 'foo',
'dd': 'bar'
};
var obj2 = capitalizeKeys( obj1 );
console.dir( obj2 );
// => { 'Aa': 'beep', 'Bb': 'boop', 'Cc': 'foo', 'Dd': 'bar' }
```
* * *
## See Also
- [`@stdlib/utils-uncapitalize-keys`][@stdlib/utils/uncapitalize-keys]: convert the first letter of each object key to lowercase.
- [`@stdlib/utils-uppercase-keys`][@stdlib/utils/uppercase-keys]: convert each object key to uppercase.
* * *
## Notice
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
## License
See [LICENSE][stdlib-license].
## Copyright
Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/utils-capitalize-keys.svg
[npm-url]: https://npmjs.org/package/@stdlib/utils-capitalize-keys
[test-image]: https://github.com/stdlib-js/utils-capitalize-keys/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/utils-capitalize-keys/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-capitalize-keys/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/utils-capitalize-keys?branch=main
[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/utils-capitalize-keys/tree/deno
[deno-readme]: https://github.com/stdlib-js/utils-capitalize-keys/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/utils-capitalize-keys/tree/umd
[umd-readme]: https://github.com/stdlib-js/utils-capitalize-keys/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/utils-capitalize-keys/tree/esm
[esm-readme]: https://github.com/stdlib-js/utils-capitalize-keys/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/utils-capitalize-keys/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-capitalize-keys/main/LICENSE
[@stdlib/utils/uncapitalize-keys]: https://github.com/stdlib-js/utils-uncapitalize-keys
[@stdlib/utils/uppercase-keys]: https://github.com/stdlib-js/utils-uppercase-keys