How to Achieve JSON Marshalling without HTML Escaping in Go?

JSON Marshalling without HTML Escaping

When serializing JSON data, it's often desirable to exclude HTML entity encoding to ensure accurate representation of characters such as < and >.

The default behavior of json.Marshal does not support customizable escaping options. However, with the introduction of custom Marshaler implementations, we can override this behavior.

Custom Marshaler

Implement a custom MarshalJSON method for your struct:

func (t *Track) MarshalJSON() ([]byte, error) {
    buffer := &bytes.Buffer{}
    encoder := json.NewEncoder(buffer)
    encoder.SetEscapeHTML(false)
    err := encoder.Encode(t)
    return buffer.Bytes(), err
}

This implementation sets EscapeHTML to false within the JSON encoder, preventing the escaping of HTML entities.

Generic Solution

For a more generic approach, define a function that applies custom marshaling to any arbitrary struct:

func JSONMarshal(t interface{}) ([]byte, error) {
    buffer := &bytes.Buffer{}
    encoder := json.NewEncoder(buffer)
    encoder.SetEscapeHTML(false)
    err := encoder.Encode(t)
    return buffer.Bytes(), err
}

This reusable function can be used to avoid HTML escaping for any struct that requires it.

Example Usage

To use one of these approaches, simply call JSON() or JSONMarshal() on your target struct type and handle the resulting byte slice as needed.

Remember that this workaround is only applicable when you have full control over the data being serialized. If external code or third-party libraries are involved, it's essential to ensure compatibility with their expected escaping behavior.

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