Mock WeChat Scan-Login (usage)

This site provides a Mock WeChat Open Platform "Website App" scan-login that is identical in and out to the official one — only the domain is swapped for this site: the same WxLogin SDK, the same callback, the same /sns/* endpoints and fields. It does not validate AppID / AppSecret and returns a fixed test user after scanning. Great for getting your integration working before you have an approved Website App.

To first understand the protocol, what wxLogin.js does, and why you'd use a JS SDK, see WeChat Scan-Login (protocol deep-dive).

Base URL: https://mock.authn.tech/wechat/.

Endpoints

Quick start

Front end — embed the QR (just point the script at this site):

<div id="login_container"></div>
<script src="https://mock.authn.tech/wechat/wxLogin.js"></script>
<script>
  new WxLogin({
    id: "login_container",
    appid: "any_AppID",     // Mock does not validate it
    scope: "snsapi_login",
    redirect_uri: encodeURIComponent("https://your-app.example/callback"),
    state: "random anti-forgery string"
  });
</script>

Backend — after the scan redirects back with a code:

curl "https://mock.authn.tech/sns/oauth2/access_token?appid=demo&secret=x&code=<CODE>&grant_type=authorization_code"
# → { access_token, expires_in, refresh_token, openid, scope, unionid }
curl "https://mock.authn.tech/sns/userinfo?access_token=<AT>&openid=<OPENID>"
# → { openid, nickname:"微信测试用户", sex, province, city, country, headimgurl, privilege, unionid }

Live demo

To click through it for real (embed QR → scan → redirect → exchange for user info), use the standalone Scan-Login Demo tool (switch to the "WeChat" tab).

Going live: change only the imported JS and the URL

The Mock's SDK is byte-for-byte identical to the official one (no encodeURIComponent on redirect_uri — the caller url-encodes it, per the official convention) and does not validate credential values. Your code stays the same; only two things change:

Backend paths, new WxLogin({...}) params, the redirect_uri?code=&state= callback and response fields all stay the same.