APIs carry most of the data in modern applications, and attackers target them directly. The fastest way to test an API thoroughly is to start from the definition or collection your team already has.

How it works

An OpenAPI (Swagger) file, a Postman collection or a HAR capture lists every endpoint, method and parameter. A DAST scanner imports it, sends authenticated requests, and tests each parameter and body field for injection, access control and API-specific issues.

Why it matters

• Many API endpoints are never reached through the web interface, so crawling alone misses them.
• API definitions make coverage complete and repeatable.
• APIs frequently return more data than the UI shows.

Best practices

• Keep your OpenAPI definition or collection up to date as part of development.
• Scan with realistic, authenticated requests for each role.
• Include every environment variable and secret through configuration, not hard-coded values.
• Re-scan whenever endpoints change.

How Vooki Pro helps

• Imports OpenAPI/Swagger, Postman collections and environments, HAR, cURL, Bruno and Insomnia.
• The API Builder organises requests into projects and folders, with {{variable}} environments.
• Scans a whole API project as one scan, or only the requests you select.
• Auto-login and a mid-scan authentication check keep API scans authenticated.

Frequently asked questions

Can I scan an API from a Postman collection?

Yes. Import the collection and its environment, configure authentication, and scan every request.

Do I need an OpenAPI file to test an API?

It helps coverage, but you can also build requests from Postman, HAR files, cURL commands or captured browser traffic.

Related: Using browser recordings to test deep workflows · The OWASP API Security Top 10, explained