How to get the JSON data sent from ajax and parsing to variable

Question

I use jquery to send ajax json data for golang web restful service. And want to parse the json data in my backend using golang. Here is simple javascript code:

    $.ajax({
        url: "http://localhost:8080/persons",
        type: "POST",
        dataType: "json",
        data: {
            "data": '{"firstName": "Hello","lastName": "World"}' 
        },
        success:function (res) {
            console.log(res)
        },
        error: function (err){
            console.log(err)
        }
    })

Then use GetRawData() to get the gin.Context information, and a json decoder to parse the json content,

data, _ := c.GetRawData()
jsonStream := string(data)
dec := json.NewDecoder(strings.NewReader(jsonStream))

t, err := dec.Token()
if err != nil {
    log.Fatal(err)
}

for dec.More() {
    var p Person
    err := dec.Decode(&p)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Hello %s\n", p.firstName)
}

Done!

What exactly are you googling _for_? A simple search for "golang json" should give you everything you need to know. — Jonathan Hall, Aug 27 '18 at 11:01
@Flimzy I've got my solution by goggle "golang json", thanks. — charles.cc.hsu, Sep 09 '18 at 09:45

Cuga · Answer 1 · 2018-08-27T13:57:20.797

-1

I'm not very familiar with Gin, but to accept application/json data, use gin.Context.BindJSON to bind the values in the request.

router.POST("/persons", func(c *gin.Context) {
  var jsonData Member
  if c.BindJSON(&jsonData) == nil {
    fmt.Println(jsonData.first_name + " " + jsonData.last_name)
  } else {
    // handle error

  }
}

Updating with Peter's suggestion for exporting the fields:

type Person struct {
    FirstName  string `json:"first_name"`
    LastName   string    `json:"last_name"`
}

edited Aug 27 '18 at 13:57

answered Aug 27 '18 at 11:51

Cuga

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Struct fields must be exported though. – Peter Aug 27 '18 at 12:44
@Peter such as this? ` type Person struct { FirstName string `json:"first_name"` LastName string `json:"last_name"` }` – Cuga Aug 27 '18 at 13:40
Yes, like this. – Peter Aug 27 '18 at 13:46

How to get the JSON data sent from ajax and parsing to variable

1 Answers1