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Environment Variables ​

Configure these in Vercel → Settings → Environment Variables.

Required Variables ​

NameRequiredDefaultPurpose
GITHUB_CLIENT_ID✅noneGitHub OAuth Client ID
GITHUB_CLIENT_SECRET✅noneGitHub OAuth Client Secret

These enable GitHub OAuth login, read by:

  • api/auth/callback.js — exchanges the auth code for a token
  • api/proxy.js — proxies GitHub API requests

Getting Client ID / Secret ​

  1. Go to https://github.com/settings/developers → New OAuth App
  2. Set the callback URL to https://your-domain/api/auth/callback
  3. Register to get the Client ID and Client Secret

Notes ​

  • Without these variables, GitHub login is disabled, but local editing, highlighting and completion still work.
  • Environment variables are server-side only and are never sent to the browser.

FAQ ​

Login still fails after configuring variables?

  • Make sure the callback URL exactly matches the OAuth App (https://your-domain/api/auth/callback, no extra query params)
  • Redeploy after changing variables