API Validation in ASP.NET

API Validation in ASP.NET — a practical guide to ASP.NET API validation with clear examples you can reuse in real projects.

ASP & ASP.NET Tutorial Series (166/247). Prefer one article? Read the complete ASP.NET tutorial.

Short description

[ApiController] auto-returns 400 for invalid models.

Validation tip

[Required, StringLength(100)]
public string Name { get; set; } = "";