How to Parse JSON Arrays into Structured Data in Go?

Parsing JSON Arrays in Go

Using Unmarshal with Defined Struct

Problem:

How to parse a complex JSON array containing objects into a structured format in Go?

Sample JSON:

[{"id":694476444991229955,"id_str":"694476444991229955"}]

Solution:

1. Define a Go struct to model the JSON data.

   type Tweet struct {
    ID       int64  `json:"id"`
    IDStr    string `json:"id_str"`
   }

2. Create a slice of the tweet struct to hold the parsed results.

   tweets := make([]Tweet, 0)

3. Unmarshal the JSON array into the tweet slice.

   err := json.Unmarshal([]byte(jsonString), &tweets)
   if err != nil {
    fmt.Println(err)
   }

4. Iterate over the tweet slice to access the parsed data.

   for _, tweet := range tweets {
    fmt.Println(tweet.ID, tweet.IDStr)
   }

Unmarshaling into Map[string]interface{} slice

Note: This method requires indexing and type assertion to access the values.

1. Create a slice of maps to hold the parsed results.

   tweets := make([]map[string]interface{}, 0)

2. Unmarshal the JSON array into the map slice.

   err := json.Unmarshal([]byte(jsonString), &tweets)
   if err != nil {
    fmt.Println(err)
   }

3. Iterate over the map slice to access the parsed data.

   for _, tweet := range tweets {
    id, ok := tweet["id"].(int64)
    if ok {
        fmt.Println("ID:", id)
    }
   }

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