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jsonenums is a tool to automate the creation of methods that satisfy the
Given the name of a (signed or unsigned) integer type T that has constants
defined, jsonenums will create a new self-contained Go source file implementing
func (t T) MarshalJSON() (byte, error) func (t *T) UnmarshalJSON(byte) error
The file is created in the same package and directory as the package that defines T. It has helpful defaults designed for use with go generate.
jsonenums is a simple implementation of a concept and the code might not be the most performant or beautiful to read.
For example, given this snippet,
package painkiller type Pill int const ( Placebo Pill = iota Aspirin Ibuprofen Paracetamol Acetaminophen = Paracetamol )
running this command
in the same directory will create the file
pill_jsonenums.go, in package
painkiller, containing a definition of
func (r Pill) MarshalJSON() (byte, error) func (r *Pill) UnmarshalJSON(byte) error
MarshalJSON will translate the value of a
Pill constant to the
representation of the respective constant name, so that the call
json.Marshal(painkiller.Aspirin) will return the bytes
UnmarshalJSON performs the opposite operation; given the
representation of a
Pill constant it will change the receiver to equal the
corresponding constant. So given
byte("\"Aspirin\"") the receiver will
Aspirin and the returned error will be
Typically this process would be run using go generate, like this:
//go:generate jsonenums -type=Pill
If multiple constants have the same value, the lexically first matching name will be used (in the example, Acetaminophen will print as “Paracetamol”).
With no arguments, it processes the package in the current directory. Otherwise, the arguments must name a single directory holding a Go package or a set of Go source files that represent a single Go package.
-type flag accepts a comma-separated list of types so a single run can
generate methods for multiple types. The default output file is t_jsonenums.go,
where t is the lower-cased name of the first type listed. The suffix can be
overridden with the
-suffix flag and a prefix may be added with the
This is not an official Google product (experimental or otherwise), it is just code that happens to be owned by Google.