lua.wetgenes.json.encode

json_string = wjson.encode(json_table)
json_string = wjson.encode(json_table,opts)

Convert a lua table into a json string. Note it must be valid json, primarily make sure that the table is either an array or a dictionary but never both. Note that we can not tell the difference between an empty array and an empty object and will assume it is an object.

An array must have a length>0 and contain an element in the first slot, eg array[1] and only contain numerical integer keys between 1 and the length. This allows for the possibility of some nil holes depending on the length lua returns but holes are not a good idea in arrays in lua. Best to use false or the special wjson.null value and avoid holes.

Also some of the internal lua types will cause errors, eg functions as these can not be converted into json.

include nulls in the output by using wetgenes.json.null

opts is an optional table that can set the following options.

ops.pretty=true
ops.pretty=" "
    Enable pretty printing, line feeds and indents and set each 
    indent level to multiples of the given string or " ".
    
ops.white=true
ops.white=" "
    Enable white space but not lines or indents, just a single space 
    between value assignment to make line wrapping easier.

ops.sort=true
    Sort the keys, so we can create stable output for better diffing.