Golang Get all POST Form data using PostParams and get values as string

Question

I want to get all the post form data and get the values as string, however using PostParams I am able to get all the post data, but the values are as array key: [value], how can I get all the form data as string values?

[Edit] I may not stated clearly, but I need to get the whole form as JSON, because I need to send the form data to another API which need the body as JSON data

form.html

<form>
    <input type='text' name='key' />
    <input type='text' name='key2' />
</form>

script.js

$.ajax( {
    url: '/post/action',
    type: 'POST',
    data: new FormData(this),
    processData: false,
    contentType: false
}).done(function(r) {
    console.log(r);
});

action.go

func PostAction(c echo.Context) error {
    form, _ := c.FormParams()
    b, _ := json.Marshal(form)
    log.Println(b) // this will print: key: [value], key2: [value]
    // I want to get value as string: key: value, key2: value

    // ..other function, return, etc
}

How can I get the form values as string? Or is there another function that does this?

Thank you very much in advance

Answer 1

No need to JSON marshal the already decoded form, simply do:

form["key"][0]
form["key2"][0]

See the docs on c.FormParams and then click on the return type to see its documentation, and you'll notice that it's just the stdlib's url.Values type, which is defined as a map of string slices (i.e., map[string][]string).

---

If you need to convert a value of type url.Values to a "simple object", you can convert it to a map[string]string using the following code:

o := make(map[string]string, len(form))
for k, v := range form {
    // if you are certain v[0] is present
    o[k] = v[0]

    // if you are not sure v[0] is present, check first
    if len(v) > 0 {
        o[k] = v[0]
    }
}

data, err := json.Marshal(o)
if err != nil {
    return err
}

// ...