field.required

• Used to mark whether the field is required (it cannot be empty)

Built-in recommended configuration

#Support for javax.validation annotations
field.required=@"javax.validation.constraints.NotBlank
field.required=@javax.validation.constraints.NotNull
field.required=@javax.validation.constraints.NotEmpty

Add support for swagger @ApiModelProperty

field.required=@io.swagger.annotations.ApiModelProperty#required

demo

SwaggerModel.java

public class SwaggerModel {

    @ApiModelProperty(value = "Field A", required = true)
    private String a;

    public String getA() {
        return a;
    }

    public void setA(String a) {
        this.a = a;
    }
}

Export as API response: