How to Automate Publishing to CSDN and WeChat MP Using Playwright (When APIs Fail)

Overview

Today's focus was on automating article publishing to CSDN and WeChat MP (微信公众号) using Playwright, after CSDN deprecated its public Open API. Key achievements include: injecting Markdown content into CSDN's dynamic editor, handling title input quirks, implementing QR code login for WeChat MP, updating the Dev.to API publisher, and consolidating platform configs into a single YAML file. We also fixed session log capture after a Claude Code update changed the log file path.

Problems and Solutions

1. CSDN Open API Deprecation → Browser Automation

Background: In early 2026, CSDN silently shut down its public Open API. All endpoints returned 404/403. We needed a fallback to keep publishing to China's largest developer platform.