Programming language: Go
Tags: Template Engines    
Latest version: v1.0.0

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Grender GoDoc Build Status

Deprecation notice

This package could be more focused, so it was split up into two improved packages:

Grender is a package that provides functionality for easily rendering HTML templates and JSON or XML data to a HTTP response. It is based on github.com/unrolled/render with some subtle modifications when it comes to rendering HTML templates.

  • Templates inheritance: {{/* extends "master.tmpl" */}}
  • Glob configuration: templates/*.tmpl
  • Normal templates as partials: {{ template "footer" .}}


Grender can be used with pretty much any web framework providing you can access the http.ResponseWriter from your handler. The rendering functions simply wraps Go's existing functionality for marshaling and rendering data.

  • HTML: Uses the html/template package to render HTML templates.
  • JSON: Uses the encoding/json package to marshal data into a JSON-encoded response.
  • XML: Uses the encoding/xml package to marshal data into an XML-encoded response.
  • Text: Passes the incoming string straight through to the http.ResponseWriter.
// main.go
package main

import (

func main() {
    r := grender.New(grender.Options{
        Charset: "ISO-8859-1",
        TemplatesGlob: "examples/*.tmpl",
    mux := http.NewServeMux()

    // This will set the Content-Type header to "application/json; charset=ISO-8859-1".
    mux.HandleFunc("/json", func(w http.ResponseWriter, req *http.Request) {
        r.JSON(w, http.StatusOK, map[string]string{"hello": "world"})

    // This will set the Content-Type header to "text/html; charset=ISO-8859-1".
    mux.HandleFunc("/html", func(w http.ResponseWriter, req *http.Request) {
        r.HTML(w, http.StatusOK, "hello.tmpl", "world")

    http.ListenAndServe("", mux)


Grender comes with a variety of configuration options. The defaults are listed below.

r := grender.New(grender.Options{
    Debug: false,       // If true, templates will be recompiled before each render call
    TemplatesGlob: "",  // Glob to your template files
    PartialsGlob: "",   // Glob to your patials or global templates
    Funcs: nil,         // Your template FuncMap
    Charset: "UTF-8",   // Charset to use for Content-Type header values

Extending another template

First, define your parent template like this.

file: master.tmpl

  {{template "content" .}}

Then, in a separate template file use a template comment on the first line to indicate that you want to extend the other template file.

file: child.tmpl

{{/* extends "master.tmpl" */}}

{{define "content"}}Hello world!{{end}}

More examples

The [grender_test.go](grender_test.go) file contains additional usage examples.



*Note that all licence references and agreements mentioned in the grender README section above are relevant to that project's source code only.