Javascript client side login, how to authenticate server side?

If you are then you can pass some kind of secret user identifier (or password) to the server. The server can perform a check to see that everything is ok and allow you to execute your calls to the private server apis.

If your authentication is done by javascript without going to the server you are doing it wrong. Any browser code can be tampered with easily. You cannot trust code run in the browser.

The best practice would be to send authentication down to the server and authenticate there. Based on that, you can do things like use a token to verify against the server, or even just send the credentials each time.

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