How to Build Passwordless Auth With Twilio Verify in Rust
Blog post from Twilio
A Twilio tutorial explains how to build a Rust-based passwordless authentication API using Twilio Verify to send and validate SMS one-time passwords. It describes passwordless authentication as an alternative to passwords that can improve convenience and reduce password-related security risks, while noting other possible methods such as passkeys, voice, email, and Silent Network Authentication. The sample application uses Axum, Handlebars templates, session management, and the Rustlio Twilio client, with GET and POST routes for entering a phone number and for submitting a six-digit verification code. Developers configure Twilio Account SID, Auth Token, and Verify Service SID values through a local environment file, create a Verify service with Fraud Guard enabled, and store the submitted phone number in the user session. The application requests an SMS code through Twilio Verify, checks the submitted code against Twilio’s service, clears the stored phone number after successful approval, and displays a success or failure status page. The tutorial concludes by adding static CSS and favicon assets, running the server on port 8080, and testing the full sign-in and verification flow in a browser.
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