Validate request bodies

Web Web Database
2026-04-17T12:05:42+00:00
Go requires manual parsing and field checking to validate HTTP request bodies since no built-in validator exists.

Go does not provide a built-in function to validate request bodies; you must manually parse and check the data using the encoding/json or net/http packages. Use json.Unmarshal to decode the body into a struct and verify required fields are populated before processing.

var req MyRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
    http.Error(w, err.Error(), http.StatusBadRequest)
    return
}
if req.RequiredField == "" {
    http.Error(w, "missing required field", http.StatusBadRequest)
    return
}