How do I download the Quandl codes of all the time-series in a given data feed?

Note that data on Quandl comes in two formats:  time-series and tables. You can learn more about these formats here.

When using a data feed in time-series format, you can download all the time-series codes and their corresponding metadata by appending /metadata to your API call. 

For example, this API call will return all time-series codes and metadata for the NASDAQ Stock Market Prices ( XNAS) data feed:

https://www.quandl.com/api/v3/databases/XNAS/metadata?api_key=YOURAPIKEY

Note that the above API call contains the Quandl code XNAS. You may replace XNAS with the Quandl code of the time-series data feed that you're using.

The above API call will return a zipped CSV file containing codes, names, descriptions, date ranges and the last update time for all time-series in the XNAS data feed.