Marshal() (type) - API Reference

Converts structured memory into a structured file format (eg for stdio)


This is a function you would write when programming a Murex data-type. The marshal function takes in a Go (golang) type or struct and returns a byte slice of a “string” representation of that format (eg in JSON) or an error.

This marshaller is then registered to Murex inside an init() function and Murex builtins can use that marshaller via the MarshalData() API.


Registering Marshal() (for writing builtin data-types)

// To avoid data races, this should only happen inside func init()
lang.Marshallers[ /* your type name */ ] = /* your readIndex func */

Using an existing marshaller (eg inside a builtin command)

// See documentation on lang.MarshalData for more details
b, err := lang.MarshalData(p, dataType, data)


Defining a marshaller for a murex data-type

package example

import (


func init() {
    // Register data-type
    lang.Marshallers["json"] = marshal

// Describe marshaller
func marshal(p *lang.Process, v interface{}) ([]byte, error) {
    if p.Stdout.IsTTY() {
        // If STDOUT is a TTY (ie not pipe, text file or other destination other
        // than a terminal) then output JSON in an indented, human readable,
        // format....
        return json.MarshalIndent(v, "", "    ")

    // ....otherwise we might as well output it in a minified format
    return json.Marshal(v)


  1. *lang.Process: Process’s runtime state. Typically expressed as the variable p
  2. interface{}: data you wish to marshal

See Also

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Last built on Fri May 19 22:45:48 UTC 2023 against commit 54b5f6754b5f67b250bbf7353e83c42ed187802584c3ae3.

Current version is 4.1.6140 which has been verified against 14045 tests cases.