Add an API to get json data

[styfle]

Some tools may want to display this install size but need their own formatting such as

• Feature Request: Show install size of each package netlify/staticgen#359
• [Feature Request] Display package size  npm/www#197
• [Feature Request] Display package size npms-io/npms-www#219

So it would be good to provide an API, maybe use /api?p=packagename@version which is similar to /badge?p=packagename@version but returns json instead of an image.

[styfle]

The API is available.

You can use the npm package name and version (cached result):

https://packagephobia.now.sh/api.json?p=next@5.1.0

Or simply the npm package name which will automatically use the latest version (never cached):

https://packagephobia.now.sh/api.json?p=next

[aleclarson]

Thank you for this! I'm going to fork https://github.com/wix/import-cost and use this instead. (That extension is known for gobbling CPU)

[styfle]

@aleclarson Thanks for letting me know!

I'll add it to the README when you finish it 😄