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get http.Response into struct using json.Unmarshal


Why can't I assign a *Struct to an *Interface?json.Unmarshal doesn't seem to pay attention to struct tagsDecoding JSON in Golang using json.Unmarshal vs json.NewDecoder.DecodeHow to print struct variables in console?Reading http.Response Body streamGo json.Unmarshal returns false structCan't Json.Unmarshal to a structAssign additional field when unmarshalling JSON object to GO structUse a seed for json.Unmarshal into a slice structhow to parse golang json array having random hash value in field name






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0















I'm calling a remote API and getting a JSON response back. I'm trying to convert the *http.Response into a struct that I defined. Everything i've tried so far has resulted in an empty struct. Here is my attempt with json.Unmarshal



type Summary struct 
Created string `json:"created"`
High float64 `json:"high"`
Low float64 `json:"low"`


func getSummary()

url := "http://myurl"

resp, err := http.Get(url)
if err != nil
log.Fatalln(err)


body, err2 := ioutil.ReadAll(resp.Body)
if err2 != nil
panic(err.Error())


log.Printf("body = %v", string(body))
//outputs: "success":true,"message":"","result":["High":0.43600000,"Low":0.43003737],"Created":"2017-06-25T03:06:46.83"]

var summary = new(Summary)
err3 := json.Unmarshal(body, &summary)
if err3 != nil
fmt.Println("whoops:", err3)
//outputs: whoops: <nil>


log.Printf("s = %v", summary)
//outputs: s = &0 0 0 0 0 0 0 0 0 0


}


What am I doing wrong? The JSON tags in my struct match the json keys from the response exactly...



edit: here is the JSON returned from the API




"success": true,
"message": "''",
"result": [

"High": 0.0135,
"Low": 0.012,
"Created": "2014-02-13T00:00:00"

]



edit
i changed the struct to this but still not working



type Summary struct 
Result struct
Created string `json:"created"`
High float64 `json:"high"`
Low float64 `json:"low"`











share|improve this question
























  • yea the program prints the whoops error. Using %v outputs the exact same

    – MikeG
    Mar 23 at 4:13












  • I added an update. Why is the output of err3 = <nil> if the previous if statement requires that eer3 is not nil?

    – MikeG
    Mar 23 at 4:22











  • body is not valid JSON. You have to remove the %!(EXTRA string= and the ) in order to be able to use json.Unmarshal on it.

    – Joel Cornett
    Mar 23 at 4:31











  • Additionally Summary is not the same shape as the JSON data anyway. You need to make it match the shape of the whole JSON object (after removing the portions mentioned above) in order to be able to unmarshal it.

    – Joel Cornett
    Mar 23 at 4:33






  • 1





    please add the response JSON in the question.

    – Sathishkumar Rakkiasamy
    Mar 23 at 4:58

















0















I'm calling a remote API and getting a JSON response back. I'm trying to convert the *http.Response into a struct that I defined. Everything i've tried so far has resulted in an empty struct. Here is my attempt with json.Unmarshal



type Summary struct 
Created string `json:"created"`
High float64 `json:"high"`
Low float64 `json:"low"`


func getSummary()

url := "http://myurl"

resp, err := http.Get(url)
if err != nil
log.Fatalln(err)


body, err2 := ioutil.ReadAll(resp.Body)
if err2 != nil
panic(err.Error())


log.Printf("body = %v", string(body))
//outputs: "success":true,"message":"","result":["High":0.43600000,"Low":0.43003737],"Created":"2017-06-25T03:06:46.83"]

var summary = new(Summary)
err3 := json.Unmarshal(body, &summary)
if err3 != nil
fmt.Println("whoops:", err3)
//outputs: whoops: <nil>


log.Printf("s = %v", summary)
//outputs: s = &0 0 0 0 0 0 0 0 0 0


}


What am I doing wrong? The JSON tags in my struct match the json keys from the response exactly...



edit: here is the JSON returned from the API




"success": true,
"message": "''",
"result": [

"High": 0.0135,
"Low": 0.012,
"Created": "2014-02-13T00:00:00"

]



edit
i changed the struct to this but still not working



type Summary struct 
Result struct
Created string `json:"created"`
High float64 `json:"high"`
Low float64 `json:"low"`











share|improve this question
























  • yea the program prints the whoops error. Using %v outputs the exact same

    – MikeG
    Mar 23 at 4:13












  • I added an update. Why is the output of err3 = <nil> if the previous if statement requires that eer3 is not nil?

    – MikeG
    Mar 23 at 4:22











  • body is not valid JSON. You have to remove the %!(EXTRA string= and the ) in order to be able to use json.Unmarshal on it.

    – Joel Cornett
    Mar 23 at 4:31











  • Additionally Summary is not the same shape as the JSON data anyway. You need to make it match the shape of the whole JSON object (after removing the portions mentioned above) in order to be able to unmarshal it.

    – Joel Cornett
    Mar 23 at 4:33






  • 1





    please add the response JSON in the question.

    – Sathishkumar Rakkiasamy
    Mar 23 at 4:58













0












0








0








I'm calling a remote API and getting a JSON response back. I'm trying to convert the *http.Response into a struct that I defined. Everything i've tried so far has resulted in an empty struct. Here is my attempt with json.Unmarshal



type Summary struct 
Created string `json:"created"`
High float64 `json:"high"`
Low float64 `json:"low"`


func getSummary()

url := "http://myurl"

resp, err := http.Get(url)
if err != nil
log.Fatalln(err)


body, err2 := ioutil.ReadAll(resp.Body)
if err2 != nil
panic(err.Error())


log.Printf("body = %v", string(body))
//outputs: "success":true,"message":"","result":["High":0.43600000,"Low":0.43003737],"Created":"2017-06-25T03:06:46.83"]

var summary = new(Summary)
err3 := json.Unmarshal(body, &summary)
if err3 != nil
fmt.Println("whoops:", err3)
//outputs: whoops: <nil>


log.Printf("s = %v", summary)
//outputs: s = &0 0 0 0 0 0 0 0 0 0


}


What am I doing wrong? The JSON tags in my struct match the json keys from the response exactly...



edit: here is the JSON returned from the API




"success": true,
"message": "''",
"result": [

"High": 0.0135,
"Low": 0.012,
"Created": "2014-02-13T00:00:00"

]



edit
i changed the struct to this but still not working



type Summary struct 
Result struct
Created string `json:"created"`
High float64 `json:"high"`
Low float64 `json:"low"`











share|improve this question
















I'm calling a remote API and getting a JSON response back. I'm trying to convert the *http.Response into a struct that I defined. Everything i've tried so far has resulted in an empty struct. Here is my attempt with json.Unmarshal



type Summary struct 
Created string `json:"created"`
High float64 `json:"high"`
Low float64 `json:"low"`


func getSummary()

url := "http://myurl"

resp, err := http.Get(url)
if err != nil
log.Fatalln(err)


body, err2 := ioutil.ReadAll(resp.Body)
if err2 != nil
panic(err.Error())


log.Printf("body = %v", string(body))
//outputs: "success":true,"message":"","result":["High":0.43600000,"Low":0.43003737],"Created":"2017-06-25T03:06:46.83"]

var summary = new(Summary)
err3 := json.Unmarshal(body, &summary)
if err3 != nil
fmt.Println("whoops:", err3)
//outputs: whoops: <nil>


log.Printf("s = %v", summary)
//outputs: s = &0 0 0 0 0 0 0 0 0 0


}


What am I doing wrong? The JSON tags in my struct match the json keys from the response exactly...



edit: here is the JSON returned from the API




"success": true,
"message": "''",
"result": [

"High": 0.0135,
"Low": 0.012,
"Created": "2014-02-13T00:00:00"

]



edit
i changed the struct to this but still not working



type Summary struct 
Result struct
Created string `json:"created"`
High float64 `json:"high"`
Low float64 `json:"low"`








go






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Mar 23 at 5:01







MikeG

















asked Mar 23 at 3:28









MikeGMikeG

2,02911436




2,02911436












  • yea the program prints the whoops error. Using %v outputs the exact same

    – MikeG
    Mar 23 at 4:13












  • I added an update. Why is the output of err3 = <nil> if the previous if statement requires that eer3 is not nil?

    – MikeG
    Mar 23 at 4:22











  • body is not valid JSON. You have to remove the %!(EXTRA string= and the ) in order to be able to use json.Unmarshal on it.

    – Joel Cornett
    Mar 23 at 4:31











  • Additionally Summary is not the same shape as the JSON data anyway. You need to make it match the shape of the whole JSON object (after removing the portions mentioned above) in order to be able to unmarshal it.

    – Joel Cornett
    Mar 23 at 4:33






  • 1





    please add the response JSON in the question.

    – Sathishkumar Rakkiasamy
    Mar 23 at 4:58

















  • yea the program prints the whoops error. Using %v outputs the exact same

    – MikeG
    Mar 23 at 4:13












  • I added an update. Why is the output of err3 = <nil> if the previous if statement requires that eer3 is not nil?

    – MikeG
    Mar 23 at 4:22











  • body is not valid JSON. You have to remove the %!(EXTRA string= and the ) in order to be able to use json.Unmarshal on it.

    – Joel Cornett
    Mar 23 at 4:31











  • Additionally Summary is not the same shape as the JSON data anyway. You need to make it match the shape of the whole JSON object (after removing the portions mentioned above) in order to be able to unmarshal it.

    – Joel Cornett
    Mar 23 at 4:33






  • 1





    please add the response JSON in the question.

    – Sathishkumar Rakkiasamy
    Mar 23 at 4:58
















yea the program prints the whoops error. Using %v outputs the exact same

– MikeG
Mar 23 at 4:13






yea the program prints the whoops error. Using %v outputs the exact same

– MikeG
Mar 23 at 4:13














I added an update. Why is the output of err3 = <nil> if the previous if statement requires that eer3 is not nil?

– MikeG
Mar 23 at 4:22





I added an update. Why is the output of err3 = <nil> if the previous if statement requires that eer3 is not nil?

– MikeG
Mar 23 at 4:22













body is not valid JSON. You have to remove the %!(EXTRA string= and the ) in order to be able to use json.Unmarshal on it.

– Joel Cornett
Mar 23 at 4:31





body is not valid JSON. You have to remove the %!(EXTRA string= and the ) in order to be able to use json.Unmarshal on it.

– Joel Cornett
Mar 23 at 4:31













Additionally Summary is not the same shape as the JSON data anyway. You need to make it match the shape of the whole JSON object (after removing the portions mentioned above) in order to be able to unmarshal it.

– Joel Cornett
Mar 23 at 4:33





Additionally Summary is not the same shape as the JSON data anyway. You need to make it match the shape of the whole JSON object (after removing the portions mentioned above) in order to be able to unmarshal it.

– Joel Cornett
Mar 23 at 4:33




1




1





please add the response JSON in the question.

– Sathishkumar Rakkiasamy
Mar 23 at 4:58





please add the response JSON in the question.

– Sathishkumar Rakkiasamy
Mar 23 at 4:58












2 Answers
2






active

oldest

votes


















2














Change your structure like this



type Summary struct 
Sucess bool `json:"success"`
Message string `json:"message"`
Result []Result `json:"result"`


type Result struct
Created string `json:"Created"`
High float64 `json:"High"`
Low float64 `json:"Low"`



Try this link






share|improve this answer
































    0














    Its because you're trying to unmarshal an array into struct,
    Use array instead of the Result struct



    type Summary struct 
    Result []struct
    Created string `json:"created"`
    High float64 `json:"high"`
    Low float64 `json:"low"`




    Use this weblink to convert your JSON objects to Go Struct >> https://mholt.github.io/json-to-go/






    share|improve this answer























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      2 Answers
      2






      active

      oldest

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      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      2














      Change your structure like this



      type Summary struct 
      Sucess bool `json:"success"`
      Message string `json:"message"`
      Result []Result `json:"result"`


      type Result struct
      Created string `json:"Created"`
      High float64 `json:"High"`
      Low float64 `json:"Low"`



      Try this link






      share|improve this answer





























        2














        Change your structure like this



        type Summary struct 
        Sucess bool `json:"success"`
        Message string `json:"message"`
        Result []Result `json:"result"`


        type Result struct
        Created string `json:"Created"`
        High float64 `json:"High"`
        Low float64 `json:"Low"`



        Try this link






        share|improve this answer



























          2












          2








          2







          Change your structure like this



          type Summary struct 
          Sucess bool `json:"success"`
          Message string `json:"message"`
          Result []Result `json:"result"`


          type Result struct
          Created string `json:"Created"`
          High float64 `json:"High"`
          Low float64 `json:"Low"`



          Try this link






          share|improve this answer















          Change your structure like this



          type Summary struct 
          Sucess bool `json:"success"`
          Message string `json:"message"`
          Result []Result `json:"result"`


          type Result struct
          Created string `json:"Created"`
          High float64 `json:"High"`
          Low float64 `json:"Low"`



          Try this link







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Mar 23 at 7:01

























          answered Mar 23 at 5:38









          Maruthi AdithyaMaruthi Adithya

          1,11311022




          1,11311022























              0














              Its because you're trying to unmarshal an array into struct,
              Use array instead of the Result struct



              type Summary struct 
              Result []struct
              Created string `json:"created"`
              High float64 `json:"high"`
              Low float64 `json:"low"`




              Use this weblink to convert your JSON objects to Go Struct >> https://mholt.github.io/json-to-go/






              share|improve this answer



























                0














                Its because you're trying to unmarshal an array into struct,
                Use array instead of the Result struct



                type Summary struct 
                Result []struct
                Created string `json:"created"`
                High float64 `json:"high"`
                Low float64 `json:"low"`




                Use this weblink to convert your JSON objects to Go Struct >> https://mholt.github.io/json-to-go/






                share|improve this answer

























                  0












                  0








                  0







                  Its because you're trying to unmarshal an array into struct,
                  Use array instead of the Result struct



                  type Summary struct 
                  Result []struct
                  Created string `json:"created"`
                  High float64 `json:"high"`
                  Low float64 `json:"low"`




                  Use this weblink to convert your JSON objects to Go Struct >> https://mholt.github.io/json-to-go/






                  share|improve this answer













                  Its because you're trying to unmarshal an array into struct,
                  Use array instead of the Result struct



                  type Summary struct 
                  Result []struct
                  Created string `json:"created"`
                  High float64 `json:"high"`
                  Low float64 `json:"low"`




                  Use this weblink to convert your JSON objects to Go Struct >> https://mholt.github.io/json-to-go/







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Mar 23 at 5:45









                  Aruna PrabashwaraAruna Prabashwara

                  12




                  12



























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