- Login to https://web.telegram.org
- Copy-paste contents of
telegram-scripts.jsinto JS console
showDialogs()to get the list of contacts with ids or the 20 last conversations in the same order of the client view
userIdis the id from step 3 (inside the  )
Process can take a while, check console for progress. Occasionall
FLOOD_WAIT errors are expected. Once done, browser will download the JSON file.
Proposed solution requires no dependencies and works with any browser/OS.