If you need to export data from Coda, you have a few different options:
Use Copy/Paste: When Coda copies, the paste is then in a standard format that most apps understand. If you need to export an entire table of data from Coda, first make sure that the the full table is visible in Coda by showing any hidden columns and removing any filters.Then just copy the table, and paste it into a spreadsheet or other app that supports pasting tables, and you'll be all set!
Print pages from your Coda docs by clicking the dropdown menu next to the doc name. More instructions here. If you prefer, you can also use this option to save your doc as a PDF in your browsers print dialog, or . . .
Export pages as PDFs from the same dropdown menu. More instructions here.
Go to Account Settings and choose Export My Data. This will generate multiple .txt & .csv files for all of your owned docs.