Todoist has an API

Todoist has 2 APIs, a standard REST one for single calls and a special “sync” one for batching actions and syncing with the Todoist service. There’s a Python library for both flavours, and a JS one for the REST API. and of course you can use cURL or anything else to make raw requests too.

Sync docs and python client library , but this is no longer being updated

REST docs, Python SDK and Typescript SDK

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Sources

• Todoist’s developer docs