go:embed embed static files directly into Go binary files. 1. Place the //go:embed directive above a variable to embed a single file into the string or []byte type; 2. Use the embed.FS type to embed multiple files or directories; 3. The file content is packaged into the program at compile time, and no external file path is required during runtime; 4. It is suitable for embedding text, HTML, configuration files and other resources, realizing zero-dependence distribution. In the example, the content of hello.txt is successfully read and printed, and the output is "Hello, embedded world!".
A simple go:embed example lets you include static files (like text, HTML, or config files) directly into your Go binary at compile time. Here's a minimal, practical example to show how it works.
Basic Example: Embedding a Text File
Let's say you have a text file and want to read its content without requiring the file to exist at runtime.
1. Project structure:
myapp/ ├── main.go └── hello.txt
2. Create hello.txt :
Hello, embedded world!
3. Write main.go :
package main
import (
"embed"
"fmt"
"log"
)
//go:embed hello.txt
var content string
func main() {
fmt.Println(content)
}4. Run it:
go run .
Output:
Hello, embedded world!
That's it — the content of hello.txt is baked into the binary.
Want to embed multiple files or a directory?
Use an embed.FS (file system):
package main
import (
"embed"
"fmt"
"log"
)
//go:embed hello.txt
var f embedded.FS
func main() {
data, err := f.ReadFile("hello.txt")
if err != nil {
log.Fatal(err)
}
fmt.Println(string(data))
} This version uses embed.FS , which is more flexible — especially when embedding whole directories.
Key Notes:
- The
//go:embeddirective must be a comment directly above a variable . - You can embed into:
-
stringor[]byte(for single files) -
embed.FS(for one or more files/directories)
-
- No external dependencies or file paths needed at runtime.
Basically, go:embed lets you bundle assets cleanly — great for templates, static web files, or configs.
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