yojson-rs: JSON library for Rust

This library parses JSON data (yojson format) into a nested Rust tree data structure.

Yojson values

A value in Yojson is represented with the Value enum in this crate:

rust pub enum Value { Null, Bool(bool), Integer(i64), Float(f64), String(String), Assoc(Assoc), Array(Array), Tuple(Vec<Value>), Variant(Variant), }

The Yojson format is an extension of the JSON format. See "Yojson format document" for more information.

Tuples: like JSON arrays but within parentheses instead of square brackets, such as (1.23, 4.56).
Variants without argument: <"Foo">.
Variants with one argument: <"Bar": 123>.
Unquoted field names and variants are accepted if they match the pattern [A-Za-z][A-Za-z_0-9]*: { x: <Foo>, "#y": <Bar2> }.
Comments: /* multiline comment */ and // end-of-line comment.
Special numeric entities: [ Infinity, -Infinity, NaN ].

Parsing JSON

Parse JSON data.

rust use yojson_rs; fn main () { let json = r#" { x : 123, y : { "y1" : "abc\ndef\u0021", "y2" : [null, 123.45, (12, "y3")] }, z : NaN } "#; assert!(yojson_rs::parser::parse(json).is_ok()); }

Convert to a JSON string.

A data structure can be converted to a JSON string by to_string.

rust use yojson_rs; fn main() { let json_str = r#" { x : 123, y : { "y1" : "abc\ndef\u0021", "y2" : [null, 123.45, (12, "y3")] }, z : NaN } "#; let json = yojson_rs::parser::parse(json_str).unwrap(); println!("{}", yojson_rs::to_string(json)); }