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# Wk-notes-01-31-g-recaptcha-npmshrinkwrap

### npmshrinkwrap

`$> npm shrinkwrap` is an old cmd to lock the version of the dependencies. It will generate a `npmshrinkwrap.json`. Using latest `node`/`npm` could cause the change of it because the **lockVersion** format have been updated in new node.

### Google recaptcha in China

Original google **recaptcha** service is blocked for obvious reason. To make it work, a chagne to hostname is necessary. Simply change `www.google.com` to `recaptcha.net` in both frontend js script and backend(**if it's set inside China firewall**) verify site call.

Library like **react-google-recaptcha** would support a setting (useRecaptchaNet) to enable global recaptcha by changing the hostname.

**Tips ：**In frontend, the init script `https://recaptcha.net/recaptcha/api.js` will return a **second layer of script** to inject an `iframe`. This static file is differed by **region**. **It will still return iframe to google.com if the region is not china**, while if you request from China, it will return iframe direct to `recaptcha.net`. In the other hand, `https://www.google.com/recaptcha/api.js` will not do this trick.

***But do not use that service unless you have to.***