Module json 

A dependency-free JSON parser and serializer.

You describe a struct and implement New, FromJSON and ToJSON for it; the trait bodies call the module’s helpers for each property. Nested objects and arrays are supported. It is not a validator or formatter, but invalid input is an error, not a panic. Submodules: object, [array], property; examples live in their tests/example_* modules (objects, nested objects, arrays of every scalar type, arrays of objects).

With the serde feature, Json<T> extracts a Deserialize type from a request body and turns a Serialize type into an application/json response — use that unless you want the explicit, macro-free mapping.

FAQ

• Line endings. The parser doesn’t care about \n vs \r\n; to_json_string writes \r\n, so compare against \r\n text in tests.
• No pretty-printing. to_json_string adds line breaks but doesn’t indent nested values.
• Why New? Parsing an array has to create instances of your struct.
• Mixed-type arrays ([1, true, "x"], tuples) don’t map to one struct type; model them as an array of objects, or split the raw array with RawUnprocessedJSONArray::split_into_vector_of_strings and parse each item.
• Numbers are i128 and f64 (JSON has one number type); cast in your FromJSON if you need smaller types. f64 has the usual binary rounding (4356.257 reads back as 4356.2569999999996) — store money as integer cents, or round when formatting.
• Enums have no JSON form: keep a string/integer property and map it to your enum in FromJSON/ToJSON.

Modules

array

JSON arrays: parse [ … ] into Vec<T> and back. For a struct type, implement New, FromJSON and ToJSON, then call from_json_list / to_json_list. Scalar arrays (integers, floats, strings, booleans, nulls) have their own helpers in the submodules.

object

JSON objects: parse { … } into a struct (parse_json) and serialize it back (to_json_string) through the FromJSON / ToJSON traits. See tests/example_multi_nested_object.

property

One JSON property: JSONProperty (name and type) and JSONValue (the parsed value — string, bool, object, array, i128, f64 or null).

Structs

JSONType

Constants

JSON_TYPE