Validate JSON in Go by using json.Unmarshal and checking the returned error to ensure the data is well-formed.
Use the encoding/json package's json.Unmarshal function to validate JSON by attempting to decode it into a variable and checking for errors. If the JSON is invalid, the function returns a non-nil error.
package main
import (
"encoding/json"
"fmt"
)
func main() {
data := []byte(`{"key": "value"}`)
var result map[string]interface{}
if err := json.Unmarshal(data, &result); err != nil {
fmt.Println("Invalid JSON:", err)
return
}
fmt.Println("Valid JSON")
}
Validating JSON in Go checks if your data follows the correct rules before your program tries to use it. Think of it like a bouncer checking IDs at a club; if the ID (data) is fake or malformed, they (the code) reject it immediately so you don't have to deal with the mess later. You use this whenever you receive data from an external source like an API or a file to ensure it's safe to process.