It is not a must to use Node.js as backend to store credentials. When setting credentials in a browser, make sure not to hard code credentials (e.g., access/secret keys for IAM users). Also, always grant the least privilege required for your task.
We do not recommend hard coding your AWS credentials in your scripts. Hard coding credentials poses a risk of exposing your access key ID and secret access key.
The recommended way to obtain AWS credentials for your browser scripts is to use the Amazon Cognito Identity credentials object, AWS.CognitoIdentityCredentials. Amazon Cognito enables authentication of users through third-party identity providers.
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