The kmj-json package provides a JSON codec.

The runtime provides this library through the luaL_newlib auxiliary library function, so all fields can be assumed to be functions.

The decode field contains a function for decoding a JSON encoded type.

decode(input: string): (output: any)

1. The first argument should contain the JSON encoded representation of a type.

1. The first return value will be the decoded Lua equivalent value type of the given JSON, or nil if the input could not be interpreted successfully.

The encode field contains a function for encoding a Lua value into a JSON encoded type.

encode(input: any): (output: string|nil)

1. The first argument should contain the Lua value that should be JSON encoded. Accepted Lua types are nil, boolean, number, string and table.

1. The first return value will be the JSON encoded representation of the given input, or a Lua nil if an unsupported value such as function, userdata or thread was given.