Gin [Question][Help] c.Json - How does it handle errors?

This is the first time i am using gin. I am very new to this..

c.Json(200, struct)

Gin is automatically converting struct to json objects and attaches the proper headers. But what happens if the conversion has any error? Can i catch it and handle it?

Is this the right place to ask questions? Or is there any discussion site for gin?

Comment From: OmarFaruk-0x01

Generally speaking, converting structs to JSON is a very straightforward process and does not usually produce errors for basic types like strings, numbers, booleans, and slices. There are chances of occurring any error while converting structs to JSON if your structs have Invalid Struct Tags, Circular References, Unsupported Types, Unexported Fields, Nested Slices or Maps.

In Gin you can get errors from the current context. If any error occurs while parsing, that error will store in the Current Context of Gin by using this method c.Error().
You can get the errors via c.Errors slice. You can use custom middleware to handle all errors in a single method (it is useful when you want to store error logs). Or you can access the c.Errors slice in your handler. The snippet of code may help you.

r.Use(func(c *gin.Context) {
     // Continue the chain of handlers
     c.Next()

    // Check for errors in the context
    errors := c.Errors
    if len(errors) > 0 {
        // Handle the errors (you can log, save to a database, or include in the HTTP response)
    for _, err := range errors {
        fmt.Println("Error:", err.Err)
    }
     }
})

r.GET("/example", func(c *gin.Context) {
    data := MyStruct{
        Name: "John Doe",
        Age:  30,
    }
        // Simulate an error during JSON conversion
    if true {
        c.Error(fmt.Errorf("failed to convert data to JSON"))
        c.JSON(500, gin.H{"error": "Internal Server Error"})
                fmt.Printf("Errors: %v",c.Errors) // Or You can get this error here
        return
    }

    c.JSON(200, data)
})

Comment From: kaylee595

If there is an error in the c.JSON conversion structure, the error will be stored in c.Errors.