Content-security-policy for XSS + subresource integrity hashes for third party hosted libraries, or just compile in the third party tool like google analytics, e.g. npmjs.com/package/analytics
There are many improvements being made to the security of single page applications (HSTS en.wikipedia.org/wiki/HTTP_Strict_..., certificate transparency en.wikipedia.org/wiki/Certificate_...) that make storing sensitive information in JS about as safe as storing them in a mobile app.
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Content-security-policy for XSS + subresource integrity hashes for third party hosted libraries, or just compile in the third party tool like google analytics, e.g. npmjs.com/package/analytics
There are many improvements being made to the security of single page applications (HSTS en.wikipedia.org/wiki/HTTP_Strict_..., certificate transparency en.wikipedia.org/wiki/Certificate_...) that make storing sensitive information in JS about as safe as storing them in a mobile app.