JSONP Response

Learn how to send JSONP responses in Iris.

Basic JSONP Response

package main

import "github.com/kataras/iris/v12"

func main() {
    app := iris.New()

    app.Get("/jsonp", func(ctx iris.Context) {
        data := iris.Map{
            "message": "Hello World",
            "status": "success",
        }

        callback := ctx.URLParam("callback")
        ctx.JSONP(data, callback)
    })

    app.Listen(":8080")
}

Custom JSONP Options

app.Get("/custom", func(ctx iris.Context) {
    data := iris.Map{
        "name": "John",
        "age":  25,
    }

    callback := ctx.URLParam("callback")
    ctx.JSONP(data, callback, iris.JSONP{
        Indent: "    ",
        Prefix: ")]}',\n",
    })
})

Error Handling

app.Get("/error", func(ctx iris.Context) {
    callback := ctx.URLParam("callback")
    if callback == "" {
        ctx.StopWithError(iris.StatusBadRequest, fmt.Errorf("callback parameter is required"))
        return
    }

    data := iris.Map{
        "error": "Something went wrong",
        "code":  500,
    }

    ctx.JSONP(data, callback)
})

Best Practices

1. Security:

   • Validate callback
   • Escape output
   • Set headers
   • Handle errors
   • Monitor usage

2. Performance:

   • Enable compression
   • Cache responses
   • Monitor size
   • Handle timeouts
   • Optimize output

3. Implementation:

   • Follow standards
   • Handle errors
   • Document usage
   • Test thoroughly
   • Monitor issues

4. Maintenance:

   • Regular updates
   • Monitor usage
   • Update security
   • Document changes
   • Review code