OAuth 2.0 PKCE Token Flow for X/Twitter API

Setting up programmatic posting to X/Twitter requires navigating the notoriously complex OAuth 2.0 PKCE authorization flow.

Even worse, expired tokens constantly break your automated agents, forcing you to manually re-authenticate your bots to keep them alive.

A complete, drop-in OAuth 2.0 PKCE flow for the X API v2.

This script generates the required code verifier/challenge, builds the auth URL, exchanges the code for access and refresh tokens, and persists them locally.

It features automatic token refreshing—rewriting your .env files dynamically upon any 401 unauthorized response.

Why You Need It: Set-it-and-forget-it social automation. Give your agents the tweet.write scope they need to operate autonomously without ever dealing with expired token crashes again.