1 
package main

import (
    "encoding/json"
    "fmt"
)

type PublicKey struct {
    name string
    price string
}

type KeysResponse struct {
    Collection []PublicKey
}

func main() {
    s := `[{"name":"Galaxy Nexus", "price":"3460.00"},{"name":"Galaxy Nexus", "price":"3460.00"}]`

    keys := make([]PublicKey,0)
    err := json.Unmarshal([]byte(s), &keys)
    if err == nil {
        fmt.Printf("%+v\n", keys)
    } else {
        fmt.Println(err)
        fmt.Printf("%+v\n", keys)
    }
}

OutPut: [{name: price:}]

I have api call returned result it is like array of object (json array) complex format. I need to parse that result by golang how can I achieve? Following data is my result it is get from api call.

[{"id":694476444991229955,"id_str":"694476444991229955","text":"Got it","sender":{"id":1690262984,"id_str":"1690262984","name":"Ashok Kumar T","screen_name":"Ashok_kumar_T","location":"Trivandrum","description":"","url":null,"entities":{"description":{"urls":[]}},"protected":false,"followers_count":68,"friends_count":32,"listed_count":0,"created_at":"Thu Aug 22 06:52:53 +0000 2013","favourites_count":5,"utc_offset":19800,"time_zone":"Chennai","geo_enabled":true,"verified":false,"statuses_count":124,"lang":"en","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"131516","profile_background_image_url":"http:\/\/abs.twimg.com\/images\/themes\/theme14\/bg.gif","profile_background_image_url_https":"https:\/\/abs.twimg.com\/images\/themes\/theme14\/bg.gif","profile_background_tile":true,"profile_image_url":"http:\/\/pbs.twimg.com\/profile_images\/378800000337984382\/5eded5a0c6fda4a85511aff15e5befd9_normal.jpeg","profile_image_url_https":"https:\/\/pbs.twimg.com\/profile_images\/378800000337984382\/5eded5a0c6fda4a85511aff15e5befd9_normal.jpeg","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/1690262984\/1429709252","profile_link_color":"009999","profile_sidebar_border_color":"EEEEEE","profile_sidebar_fill_color":"EFEFEF","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":false,"default_profile_image":false,"following":true,"follow_request_sent":false,"notifications":false},"sender_id":1690262984,"sender_id_str":"1690262984","sender_screen_name":"Ashok_kumar_T","recipient":{"id":4848598394,"id_str":"4848598394","name":"Prabhu","screen_name":"prabhu_cfml","location":"","description":"","url":null,"entities":{"description":{"urls":[]}},"protected":false,"followers_count":1,"friends_count":1,"listed_count":0,"created_at":"Tue Feb 02 09:25:17 +0000 2016","favourites_count":0,"utc_offset":null,"time_zone":null,"geo_enabled":false,"verified":false,"statuses_count":0,"lang":"en-gb","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"F5F8FA","profile_background_image_url":null,"profile_background_image_url_https":null,"profile_background_tile":false,"profile_image_url":"http:\/\/abs.twimg.com\/sticky\/default_profile_images\/default_profile_3_normal.png","profile_image_url_https":"https:\/\/abs.twimg.com\/sticky\/default_profile_images\/default_profile_3_normal.png","profile_link_color":"2B7BB9","profile_sidebar_border_color":"C0DEED","profile_sidebar_fill_color":"DDEEF6","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":true,"default_profile_image":true,"following":false,"follow_request_sent":false,"notifications":false},"recipient_id":4848598394,"recipient_id_str":"4848598394","recipient_screen_name":"prabhu_cfml","created_at":"Tue Feb 02 11:04:21 +0000 2016","entities":{"hashtags":[],"symbols":[],"user_mentions":[],"urls":[]}},{"id":694476425793916931,"id_str":"694476425793916931","text":"Hi","sender":{"id":1690262984,"id_str":"1690262984","name":"Ashok Kumar T","screen_name":"Ashok_kumar_T","location":"Trivandrum","description":"","url":null,"entities":{"description":{"urls":[]}},"protected":false,"followers_count":68,"friends_count":32,"listed_count":0,"created_at":"Thu Aug 22 06:52:53 +0000 2013","favourites_count":5,"utc_offset":19800,"time_zone":"Chennai","geo_enabled":true,"verified":false,"statuses_count":124,"lang":"en","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"131516","profile_background_image_url":"http:\/\/abs.twimg.com\/images\/themes\/theme14\/bg.gif","profile_background_image_url_https":"https:\/\/abs.twimg.com\/images\/themes\/theme14\/bg.gif","profile_background_tile":true,"profile_image_url":"http:\/\/pbs.twimg.com\/profile_images\/378800000337984382\/5eded5a0c6fda4a85511aff15e5befd9_normal.jpeg","profile_image_url_https":"https:\/\/pbs.twimg.com\/profile_images\/378800000337984382\/5eded5a0c6fda4a85511aff15e5befd9_normal.jpeg","profile_banner_url":"https:\/\/pbs.twimg.com\/profile_banners\/1690262984\/1429709252","profile_link_color":"009999","profile_sidebar_border_color":"EEEEEE","profile_sidebar_fill_color":"EFEFEF","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":false,"default_profile_image":false,"following":true,"follow_request_sent":false,"notifications":false},"sender_id":1690262984,"sender_id_str":"1690262984","sender_screen_name":"Ashok_kumar_T","recipient":{"id":4848598394,"id_str":"4848598394","name":"Prabhu","screen_name":"prabhu_cfml","location":"","description":"","url":null,"entities":{"description":{"urls":[]}},"protected":false,"followers_count":1,"friends_count":1,"listed_count":0,"created_at":"Tue Feb 02 09:25:17 +0000 2016","favourites_count":0,"utc_offset":null,"time_zone":null,"geo_enabled":false,"verified":false,"statuses_count":0,"lang":"en-gb","contributors_enabled":false,"is_translator":false,"is_translation_enabled":false,"profile_background_color":"F5F8FA","profile_background_image_url":null,"profile_background_image_url_https":null,"profile_background_tile":false,"profile_image_url":"http:\/\/abs.twimg.com\/sticky\/default_profile_images\/default_profile_3_normal.png","profile_image_url_https":"https:\/\/abs.twimg.com\/sticky\/default_profile_images\/default_profile_3_normal.png","profile_link_color":"2B7BB9","profile_sidebar_border_color":"C0DEED","profile_sidebar_fill_color":"DDEEF6","profile_text_color":"333333","profile_use_background_image":true,"has_extended_profile":false,"default_profile":true,"default_profile_image":true,"following":false,"follow_request_sent":false,"notifications":false},"recipient_id":4848598394,"recipient_id_str":"4848598394","recipient_screen_name":"prabhu_cfml","created_at":"Tue Feb 02 11:04:17 +0000 2016","entities":{"hashtags":[],"symbols":[],"user_mentions":[],"urls":[]}}]
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1 Answer 1

Reset to default
5

You missed one point only: you need to export the fields of your struct:

type PublicKey struct {
    Name  string
    Price string
}

And it will work (try it on the Go Playground):

[{Name:Galaxy Nexus Price:3460.00} {Name:Galaxy Nexus Price:3460.00}]

Note that the JSON text contains the field names with lowercased text, but the json package is "clever" enough to match them. If they would be completely different, you could use struct tags to tell the json package how they are found (or how they should be marshaled) in the JSON text, e.g.:

type PublicKey struct {
    Name  string `json:"some_name"`
    Price string `json:"JsonPrice"`
}

To parse your other JSON text, create a Go struct that models the JSON data. I suggest to format the JSON to see the real structure, e.g. you can use this online JSON formatter/validator. Then you can unmarshal into a slice of this struct.

Or simply unmarshal into a slice of maps, e.g. []map[string]interface{}, but then you need to index the map to get the different values, and you also need to use type assertion to get "typed" values.

Improve this answer
5
  • Thank. But how can i parse the following data [{ "id": 694476444991229955, "id_str": "694476444991229955", "text": "Got it", "sender": { "id": 1690262984, "id_str": "1690262984", "name": "Ashok Kumar T", "screen_name": "Ashok_kumar_T", "location": "Trivandrum", "description": "", "url": null, "entities": { "description": { "urls": [] } }, "protected": false, "followers_count": 68, "friends_count": 32, }]
    – cfprabhu
    Commented Feb 4, 2016 at 14:11
  • I am a new guy for golang. Can you give the golangplay url for one complex json parse example please?
    – cfprabhu
    Commented Feb 4, 2016 at 14:26
  • @cfprabhu Your example, but change the type of keys, e.g. keys := []map[string]interface{}{}.
    – icza
    Commented Feb 4, 2016 at 14:30
  • play.golang.org/p/4U4oDvOBRA But i get invalid character '}' looking for beginning of object key string
    – cfprabhu
    Commented Feb 4, 2016 at 14:37
  • @cfprabhu Because the json you try to unmarshal is invalid, remove the last comma in this line: "url": null,
    – icza
    Commented Feb 4, 2016 at 14:45

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