How to Handle JSON and Image Upload Simultaneously in a Go Gin Framework?

Receiving JSON Data and Image in Go Using Gin

In Go, we can use the Gin framework to handle HTTP requests and bind data to custom request structures. To receive both JSON data and an image in a single multipart/form-data request, we can define the following request handler:

func UpdateProfile(c *gin.Context) {
    type request struct {
        Avatar      *multipart.FileHeader `form:"avatar" binding:"required"`
        User struct {
            Username    string `json:"username" binding:"required,min=4,max=20"`
            Description string `json:"description" binding:"required,max=100"`
        } `form:"user" binding:"required"`
    }

    var updateRequest request

    // Bind the request data to the request structure
    if err := c.ShouldBindWith(&updateRequest, binding.FormMultipart); err != nil {
        // Return an appropriate error response
        _ = c.AbortWithError(http.StatusBadRequest, err)
        return
    }

    // Handle the image
    // ...

    // Handle the JSON data
    // ...
}

Example Request:

To send a request with both JSON data and an image, use a multipart/form-data content type. The request body should be structured as follows:

--boundary
Content-Disposition: form-data; name="avatar"; filename="profile.jpg"
Content-Type: image/jpeg
//... image data
--boundary
Content-Disposition: form-data; name="user"
Content-Type: application/json
{
    "username": "username",
    "description": "description"
}
--boundary--

Notes:

• The binding tags ensure that the appropriate field validation occurs.
• c.ShouldBindWith explicitly binds the request data using the FormMultipart binding engine, which is designed for multipart/form-data requests.

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