Two-factor Authentication API
You set up a two factor authentication api by linking an identity server to your app. This service sends a one-time code to check who is trying to log in. Engineering teams add this step to stop stolen passwords from causing a breach. Yet once a user passes this login check, broad roles still grant too much power. A single login does not control what happens during the rest of the session. How a two factor authentication api works A two factor authentication api adds a second step to your nor
Multi-Factor Authentication (MFA) + REST API Authentication: the complete guide
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You set up a two factor authentication api by linking an identity server to your app. This service sends a one-time code to check who is trying to log in. Engineering teams add this step to stop stolen passwords from causing a breach. Yet once a user passes this login check, broad roles still grant too much power. A single login does not control what happens during the rest of the session.
How a two factor authentication api works
A two factor authentication api adds a second step to your normal login flow. First, a user enters a username and password into your app. Your backend checks those details against your user database. Next, your server calls the external service to start a second check. The service creates a short code that expires in a few minutes. It sends this code to the user by text message, voice call, or push prompt. Some teams use time-based codes from an app on a phone instead. Your app then asks the user to type in that short code. Your backend sends the code back to the service to check if it matches. If the code is right, your app creates a session token for the user. Teams store secret keys on the backend to sign and verify these requests.
Choosing delivery methods for your login flow
Teams can pick from several ways to send login codes to users. Text messages and voice calls are fast to set up for most apps. Users just need a working phone number to get their login code. Still, attackers can hijack phone numbers through telecom support tricks. Push notifications and phone apps offer stronger protection against stolen codes. These tools bind the login check to a physical device owned by the user. Hardware keys offer the highest level of safety for admin accounts. They check the site domain before they send a cryptographic signature back. Many teams support two methods so users have a backup option if they lose a phone. You should match the method to the risk level of the user role. Admin roles need hardware keys or device prompts rather than text messages.
What the login check solves and what it leaves open
This two-step login process solves the problem of weak or stolen passwords. An attacker with a leaked password cannot log in without the second device. It blocks automated bots from guessing passwords to break into user accounts. Still, a two factor authentication api only checks identity at the front door. Once a developer or admin logs in, the keeps the session active for hours. The login service does not see what commands or queries run after that point. If an engineer has a broad role, they can still drop a table by mistake. They can also run a query that pulls thousands of customer emails and card numbers. A login check decides who gets in, not what individual statements do in flight. Teams still need a way to inspect every action and rewrite sensitive fields in results.
Multi-Factor Authentication (MFA) + REST API Authentication: architecture patterns and best practices
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Check database and API queries on the wire
Identity tools, roles, and network rules decide who opens a session. Setup alone cannot check what each query does or mask sensitive values in a response once a session starts. When workflows touch Postgres, MySQL, SQL Server, MongoDB, ClickHouse, Kubernetes APIs, SSH, or internal HTTP APIs, hoop.dev sits inline in the wire protocol beside those services as an open-source proxy, a sidecar for your Postgres or API. On every query an AI agent or engineer runs against production, hoop.dev decides to pass, mask, block, or hold it for human review.
Your login details and client tools stay as they are while hoop.dev guardrails refuse bad deletes or drops before they run, and hoop.dev data masking rewrites matched sensitive values in responses in memory. Furthermore, hoop.dev holds SOC 2 Type II, is MIT licensed, and writes every query and decision to an audit trail that generates evidence for HIPAA, GDPR, and PCI DSS. See the source on GitHub.
Frequently asked questions
What happens if the external login service goes down?
Users cannot finish the second check if your provider has an outage. Teams often build a fallback path using backup codes or a second provider.
How long should a one-time login code stay valid?
Short codes should expire after thirty seconds to five minutes. A short window stops attackers from guessing or reusing old codes.
Does a two-step login protect internal databases from bad queries?
No, it only checks who the user is at the start of a session. It does not inspect database queries or block risky commands after login.