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In this example the same secret is used for all tokens that are generated. This may be useful as all tokens can be invalidated by changing the secret, and given the short length of the token date limit range this can work well. However, it may be advantageous to use the csrf npm package token.secret() function to dynamically create a new secret for each token that is generated. You could then store both the token and the secret in a database, or Azure Table Storage, and use the token to look up the stored secret, to later verify the token on the subsequent request.
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