Overview

Combine binding and validation rules to reject malformed requests early.

Example

var in CreateUserRequest
if err := c.BindJSON(&in); err != nil {
  return c.JSON(400, apiError("invalid payload"))
}

Best Practices

• Keep validation near API boundaries.
• Return field-level validation feedback.

Common Pitfalls

• Re-validating the same payload in multiple layers.
• Ignoring required/optional field semantics.