Golang JSON in HTML Script tag

Question

I am trying to create html email content in Go using go templates. Inside the html email content I need to store JSON data like this:

<script type ="application/ld+json">
   [
   { JSON Object},
   { JSON Object}
   ]
</script>

Unfortunately, I can not figure out how to do this with go lang. This is what I have tried so far:

tr, err := template.New("tr").Parse("<html><body><script type=\"application/ld+json\">{{.}}</script></body></html>")
if err != nil {
    log.Fatal(err)
}

var doc bytes.Buffer
err = tr.Execute(&doc, template.HTML(emailModel))
if err != nil {
    log.Fatal(err)
}

emailHtmlContent := doc.String()

fmt.Println(emailHtmlContent)

When I execute this, the JSON is stored in "" double quotes of a string. If I use a <pre> tag the double quotes are not shown but I need to store the JSON in a script tag. Is there a way to pull this off?

Thanks alread!

Try template.JS instead of template.HTML.

mkopriva
– mkopriva

2021-05-03 13:56:16 +00:00
Commented May 3, 2021 at 13:56 — mkopriva
– mkopriva, Commented May 3, 2021 at 13:56
Example: play.golang.org/p/ix-kU5pDMaE

mkopriva
– mkopriva

2021-05-03 14:00:11 +00:00
Commented May 3, 2021 at 14:00 — mkopriva
– mkopriva, Commented May 3, 2021 at 14:00

Jakub Dóka · Accepted Answer · 2021-05-03 13:56:16Z

2

you can use text/template instead, it will not escape strings.

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "log"
    "text/template"
)

type Student struct {
    Id   string `json:"id"`
    Name string `json:"name"`
}

func main() {
    emailModel, err := json.Marshal(Student{Id: "m", Name: "k"})
    if err != nil {
        log.Fatal(err)
    }
    tr, err := template.New("tr").Parse("<html><body><script type=\"application/ld+json\">{{.}}</script></body></html>")
    if err != nil {
        log.Fatal(err)
    }

    var doc bytes.Buffer
    err = tr.Execute(&doc, string(emailModel))
    if err != nil {
        log.Fatal(err)
    }

    emailHtmlContent := doc.String()

    fmt.Println(emailHtmlContent)
}

answered May 3, 2021 at 13:56

Jakub Dóka

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1 Comment

callya Over a year ago

Great. Thanks. Exactly what I was looking for

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