How to Convert a Go Map to XML Data?

Marshall Maps to XML in Go

When attempting to convert a map to XML data, an error may be encountered:

xml: unsupported type: map[string]int

While it is straightforward to marshal maps to JSON, using a struct may not be the only option.

To resolve this issue, the xml.Marshaler interface can be utilized:

<code class="go">// Marshal maps into XML.
func (s StringMap) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
    tokens := []xml.Token{start}

    for key, value := range s {
        t := xml.StartElement{Name: xml.Name{"", key}}
        tokens = append(tokens, t, xml.CharData(value), xml.EndElement{t.Name})
    }

    tokens = append(tokens, xml.EndElement{start.Name})

    for _, t := range tokens {
        err := e.EncodeToken(t)
        if err != nil {
            return err
        }
    }

    // flush to ensure tokens are written
    return e.Flush()
}</code>

By implementing the MarshalXML method for a custom StringMap type, the map can be marshalled as XML.

To use the marshalled XML:

<code class="go">output, err := xml.MarshalIndent(data, "", "  ")</code>

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