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# caniuse-lite

> A smaller version of caniuse-db, with only the essentials!

## Why?

The full data behind [Can I use][1] is incredibly useful for any front end
developer, and on the website all of the details from the database are displayed
to the user. However in automated tools, [many of these fields go unused][2];
it's not a problem for server side consumption but client side, the less
JavaScript that we send to the end user the better.

caniuse-lite then, is a smaller dataset that keeps essential parts of the data
in a compact format. It does this in multiple ways, such as converting `null`
array entries into empty strings, representing support data as an integer rather
than a string, and using base62 references instead of longer human-readable
keys.

This packed data is then reassembled (via functions exposed by this module) into
a larger format which is mostly compatible with caniuse-db, and so it can be
used as an almost drop-in replacement for caniuse-db for contexts where size on
disk is important; for example, usage in web browsers. The API differences are
very small and are detailed in the section below.


## API

```js
import * as lite from 'caniuse-lite';
```

### `lite.agents`

caniuse-db provides a full `data.json` file which contains all of the features
data. Instead of this large file, caniuse-lite provides this data subset
instead, which has the `browser`, `prefix`, `prefix_exceptions`, `usage_global`
and `versions` keys from the original.

In addition, the subset contains the `release_date` key with release dates (as timestamps) for each version:
```json
{
  "release_date": {
    "6": 998870400,
    "7": 1161129600,
    "8": 1237420800,
    "9": 1300060800,
    "10": 1346716800,
    "11": 1381968000,
    "5.5": 962323200
  }
}
```

### `lite.feature(js)`

The `feature` method takes a file from `data/features` and converts it into
something that more closely represents the `caniuse-db` format. Note that only
the `title`, `stats` and `status` keys are kept from the original data.

### `lite.features`

The `features` index is provided as a way to query all of the features that
are listed in the `caniuse-db` dataset. Note that you will need to use the
`feature` method on values from this index to get a human-readable format.

### `lite.region(js)`

The `region` method takes a file from `data/regions` and converts it into
something that more closely represents the `caniuse-db` format. Note that *only*
the usage data is exposed here (the `data` key in the original files).


## Contributors

Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):

<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
<!-- prettier-ignore -->
| [<img src="https://avatars.githubusercontent.com/u/1282980?v=3" width="100px;"/><br /><sub><b>Ben Briggs</b></sub>](http://beneb.info)<br />[💻](https://github.com/ben-eb/caniuse-lite/commits?author=ben-eb "Code") [📖](https://github.com/ben-eb/caniuse-lite/commits?author=ben-eb "Documentation") [👀](#review-ben-eb "Reviewed Pull Requests") [⚠️](https://github.com/ben-eb/caniuse-lite/commits?author=ben-eb "Tests") | [<img src="https://avatars.githubusercontent.com/u/1737375?v=3" width="100px;"/><br /><sub><b>Andy Jansson</b></sub>](https://github.com/andyjansson)<br />[💻](https://github.com/ben-eb/caniuse-lite/commits?author=andyjansson "Code") | [<img src="https://avatars1.githubusercontent.com/u/19343?v=4" width="100px;"/><br /><sub><b>Andrey Sitnik</b></sub>](http://twitter.com/sitnikcode)<br />[💻](https://github.com/ben-eb/caniuse-lite/commits?author=ai "Code") | <img src="https://avatars2.githubusercontent.com/u/947326?v=4" width="100px;"/><br /><sub><b>Igor Deryabin</b></sub><br />[💻](https://github.com/ben-eb/caniuse-lite/commits?author=rodweb "Code") |
| :---: | :---: | :---: | :---: |
<!-- ALL-CONTRIBUTORS-LIST:END -->

This project follows the [all-contributors](https://github.com/kentcdodds/all-contributors) specification. Contributions of any kind welcome!

<img src="https://opensource.nyc3.digitaloceanspaces.com/attribution/assets/SVG/DO_Logo_icon_blue.svg" alt="Digital Ocean logo" width="40" align="left">

Big thanks to [DigitalOcean](https://www.digitalocean.com/?utm_source=opensource&utm_campaign=caniuse-lite) for supporting this project by providing their great infrastructure for us.

## License

The data in this repo is available for use under a CC BY 4.0 license
(http://creativecommons.org/licenses/by/4.0/). For attribution just mention
somewhere that the source is caniuse.com. If you have any questions about using
the data for your project please contact me here: http://a.deveria.com/contact

[1]: http://caniuse.com/
[2]: https://github.com/Fyrd/caniuse/issues/1827

## Security contact information

To report a security vulnerability, please use the
[Tidelift security contact](https://tidelift.com/security).
Tidelift will coordinate the fix and disclosure.