Passing Data from Datastore to http.Writer - go

Question

I was recently introduced to the wonders of the language known as go. I set myself a task of writing a RESTful API using GoLang and Google's Datastore. I am able to retrieve data from Datastore and Print it to the console using fmt.Println however the issue comes into play when I try to use the data from Datastore and pass it to the http.Handler.
I was wondering if someone could inform me of where I am going wrong or even point me in the right direction.
Here is what I have done so far
package main
import (
"log"
"fmt"
"context"
"net/http"
// "encoding/json"
"cloud.google.com/go/datastore"
)
type Item struct {
Id string `datastore:"id"`
Name string `datastore:"title"`
View int `datastore:"views"`
Brand string `datastore:"brand"`
id int64 // interger from "Name/ID" fild in datastore entities list
}
func main() {
http.HandleFunc("/", ListTasks)
http.ListenAndServe(":8080", nil)
}
//func ListTasks(w http.ResponseWriter, r *http.Request) ([]*Item, error) {
func ListTasks(w http.ResponseWriter, r *http.Request) {
ctx := context.Background()
client, err := datastore.NewClient(ctx, "my-client")
if err != nil {
log.Fatalln(err)
}
var tasks []*Item
query := datastore.NewQuery("my-query")
keys, err := client.GetAll(ctx, query, &tasks)
if err != nil {
return nil, err
}
for i, key := range keys {
tasks[i].id = key.ID
}
return tasks, nil
}
I've also looked into http Wrappers, but I'm unaware if using a wrapper is 100% necessary or if I'm just adding more to my plate.

Answer 1

I've removed the return tasks, nil as it appeared to be unnecessary, modified the return, nil err to log.Fatalln(nil, err) and also encoded tasks as instructed by #ThunderCat and #tkausl. My issue has been resolved, thank you.
Here is my working code
package main
import (
"log"
"context"
"net/http"
"encoding/json"
"cloud.google.com/go/datastore"
)
type Item struct {
Id string `datastore:"id"`
Name string `datastore:"title"`
View int `datastore:"views"`
Brand string `datastore:"brand"`
id int64 // interger from "Name/ID" fild in datastore entities list
}
func main() {
http.HandleFunc("/", ListTasks)
http.ListenAndServe(":8080", nil)
}
func ListTasks(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
ctx := context.Background()
client, err := datastore.NewClient(ctx, "my-client")
if err != nil {
log.Fatalln(err)
}
var tasks []*Item
query := datastore.NewQuery("my-query")
keys, err := client.GetAll(ctx, query, &tasks)
if err != nil {
log.Fatalln(nil, err)
}
for i, key := range keys {
tasks[i].id = key.ID
}
json.NewEncoder(w).Encode(tasks)
// return tasks, nil
}
It now returns [{"Id":"24X660","Name":"Fiesta","View":129,"Brand":"Ford"}]
Also thank you to #static_cast for correcting my formatting errors.