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Pros
Pro JSON API
The i18nexus API lets you access your translations live when connected to your app. You can even use their CDN to access specific versions of your strings and translations.
Pro Uses Google Translate to automatically translate your strings
While you're developing, it's nice to see what your app looks like in another language before you're ready to hire professional translators. Every time you add a new string, it is automatically translated to any languages you want. Really cool feature.
Pro Really easy integration
i18nexus perfectly integrates with the popular open source i18next library. Takes only a few minutes to setup.
Cons
Con Currently only supports i18next syntax
Right now you have to use i18next syntax. So if you want use react-intl, this might not be a good fit. But i18next is one of the most popular open source libraries out there for JavaScript localization.