How to Build Passwordless Auth With Twilio Verify in Go
Blog post from Twilio
A Twilio tutorial explains how to build a Go-based passwordless authentication API that sends and validates SMS one-time passwords through Twilio Verify. It describes passwordless authentication as an alternative to traditional passwords, using a user’s phone number and a temporary code to improve convenience while reducing password-related security risks. The application uses four GET and POST routes across the sign-in and verification endpoints, Go’s net/http package for the server, HTML templates for forms and status messages, Gorilla Sessions for cookie-based storage of the phone number, and Twilio’s Go helper library to create and check verifications. Developers configure Twilio Account SID, Auth Token, and Verify Service SID values in a .env file, create a Verify service with Fraud Guard enabled, then implement handlers that submit a phone number, request an SMS OTP, display a code-entry form, validate the submitted code, and report whether Twilio returned an approved status. The tutorial concludes by instructing users to add styling, run the server on port 8080, and test the complete SMS verification flow locally.
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