Templ Has a Free API That Builds Type-Safe HTML Templates in Go

#go #webdev #templ #html

Templ generates Go code from HTML templates. Type-safe, fast, with LSP support in your editor. No more text/template runtime errors.

Quick Start

go install github.com/a-h/templ/cmd/templ@latest

Define a Template

// hello.templ
package main

templ Hello(name string) {
    <div>
        <h1>Hello, { name }!</h1>
        <p>Welcome to Templ.</p>
    </div>
}

templ Page(title string, body templ.Component) {
    <!DOCTYPE html>
    <html>
        <head><title>{ title }</title></head>
        <body>
            @body
        </body>
    </html>
}

Use in Go

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        component := Page("Home", Hello("World"))
        component.Render(r.Context(), w)
    })
    http.ListenAndServe(":3000", nil)
}

Type Safety

// This won't compile — wrong type
templ UserCard(user User) {
    <div>{ user.Name }</div>
    <div>{ user.Age }</div>  // compile error if Age is int, not string
}

Templ vs text/template vs html/template

Feature	Templ	text/template	html/template
Type-safe	Yes	No	No
LSP	Yes	No	No
Runtime errors	None	Common	Common
XSS protection	Automatic	No	Yes

The Bottom Line

Templ is the right way to do HTML in Go. Type-safe, fast, with editor support. Stop using text/template for HTML.

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