how to display ipynb notebook file in bitbucket?

As of 11/2018, this has moved. Click on your Avatar then Bitbucket Settings then Marketplace. You can search for or scroll down to the Notebook Viewer by Atlassian add-on and install it.

If you then go back to the .ipynb file, you will see a drop-down menu at the top that says "Default File Viewer". "Ipython Notebook" will appear as an option after you install the Notebook Viewer add-on and refresh. You can then toggle between the raw JSON and the Notebook views.

I found a solution from Bitbucket dev post:

• To install the addon, click your avatar in the lower left corner and select "Integrations".
• You should now see "Bitbucket Notebook Viewer" listed in the addon listings.
• Once you have installed the addon you will get the option to render as a notebook on any file with the extension ".ipynb".

For team project repo, it should be installed under team account.