Handling Large JSON Responses with Go - Out of Memory Error
This might be a silly question, but I'm working on a Go application that needs to fetch and process a large JSON response from an external API. The response size can reach several megabytes, and I've been encountering an `out of memory` error when trying to unmarshal the JSON into a struct. I've tried using `json.Unmarshal`, but it seems like the whole response is being held in memory, which is causing the crash. Here's the code I have so far: ```go package main import ( "encoding/json" "fmt" "io/ioutil" "net/http" ) type LargeResponse struct { Data []struct { ID int `json:"id"` Name string `json:"name"` } `json:"data"` } func fetchData(url string) (*LargeResponse, error) { resp, err := http.Get(url) if err != nil { return nil, err } defer resp.Body.Close() body, err := ioutil.ReadAll(resp.Body) if err != nil { return nil, err } var result LargeResponse if err := json.Unmarshal(body, &result); err != nil { return nil, err } return &result, nil } func main() { url := "https://api.example.com/large-data" data, err := fetchData(url) if err != nil { fmt.Println("Error fetching data:", err) return } fmt.Println("Data fetched successfully:", data) } ``` I've also tried streaming the response directly into a file before processing it, but I'm not sure how to handle the JSON parsing in a way that doesn't require loading the entire structure into memory. Is there a more memory-efficient way to handle large JSON responses in Go? I'm currently using Go version 1.19.5 and have tried both the standard library and the `jsoniter` library without much difference in memory usage. Any suggestions on best practices for this scenario would be greatly appreciated! My development environment is Linux.