package main
​
import "github.com/kataras/iris/v12"
​
func main() {
    app := iris.New()
    app.RegisterView(iris.HTML("./templates", ".html"))
​
    app.Get("/", showForm)
    app.Post("/", handleForm)
​
    app.Listen(":8080")
}
​
func showForm(ctx iris.Context) {
    ctx.View("form.html")
}
​
type formExample struct {
    Colors []string `form:"colors[]"` // or just "colors".
}
​
func handleForm(ctx iris.Context) {
    var form formExample
    err := ctx.ReadForm(&form)
    if err != nil {
        ctx.StopWithError(iris.StatusBadRequest, err)
        return
    }
​
    ctx.JSON(iris.Map{"Colors": form.Colors})
}

<form action="/" method="POST">
    <p>Check one or more colors</p>
​
    <label for="red">Red</label>
    <!-- name can be "colors" too -->
    <input type="checkbox" name="colors[]" value="red" id="red">
    <label for="green">Green</label>
    <input type="checkbox" name="colors[]" value="green" id="green">
    <label for="blue">Blue</label>
    <input type="checkbox" name="colors[]" value="blue" id="blue">
    <input type="submit">
</form>

{
  "Colors": [
    "red",
    "green",
    "blue"
  ]
}