Is it possible to edit file and commit github/bitbucket from browser

I want to use editor in browser and save in github without server. Just like text editor in github/bitbucket could new file and save it

I want to know are there any REST api of this 2 services to easily commit file like that

Or a git library in js that could work without the need to pull all files in to our machine

edit:

After 2018 both service already expose their API. This question is outdated

Solution

In case you're looking for an online code editor that you can connect to github or bitbucket then you could take a look at these:

If you're looking to develop such an editor yourself, you could just start from github or bitbucket's REST API documentation:

And just choose the javascript REST library of your preference to interact with those APIs.

For Github: to create/update/remove files you can use the Contents resources.