plainjson

This library simply provides:

• JsonTag: A low-level JSON tag parser which reads JSON tags from an instance which implements trait std::io::Read
• JsonNode: A JSON parser which supports getting or setting value from/to selected JSON nodes by JSONPath

Note: Filter expression in JSONPath is not implemented yet, so currently filter expression is not supported.

Getting value by JSONPath is like:

use plainjson::JsonNode;
fn get_value_by_json_path() {
    let json = r#"{"a": 123, "b": {"c": "hello"}}"#;
    let mut json = JsonNode::parse_single_node(json.as_bytes()).unwrap();
    let c = json.get_str("$.b.c").unwrap();
    assert_eq!(c, Some(String::from("hello")));
}

Setting value by JSONPath is like:

use plainjson::JsonNode;
fn set_value_by_json_path() {
    let json = r#"{"a": 123, "b": [3, 2, 1]}"#;
    let mut json = JsonNode::parse_single_node(json.as_bytes()).unwrap();
    json.set_bool("$.b[1]", true).unwrap();
    assert_eq!(json.to_string(), r#"{"a": 123, "b": [3, true, 1]}"#)
}

If you need to access low-level JSON tags, use JsonTag:

use plainjson::JsonTag;
fn fix_json() {
    let json = r#"{"a": test, "b": "world"}"#;
    let mut tags = JsonTag::parse(json.as_bytes()).unwrap();
    tags[3] = JsonTag::Literal(String::from(r#""test""#));
    assert_eq!(JsonTag::to_string(&tags), r#"{"a": "test", "b": "world"}"#);
}

This library is licensed under MIT license.