module JSON

JSON: parsing into JSON::Value and generation from any value.

require "json"
doc = JSON.parse('{"name": "quarz", "tags": ["lang", "vm"]}')
doc["name"].as_s                          # => "quarz"
doc["tags"][1].as_s                       # => "vm"
doc["missing"]                            # raises KeyError
JSON.generate({ a: 1, b: [true, nil] })   # => "{\"a\":1,\"b\":[true,null]}"

JSON.generate accepts nil, booleans, numbers, strings, symbols, arrays, hashes, sets, data values and JSON::Value. Other objects are generated from their fields, unless they define to_json -> String.

<std:json>:15

Classes and modules

• JSON::GeneratorError Raised by JSON.generate on a value JSON cannot represent, such as a Float infinity or NaN.
• JSON::ParseError Raised by JSON.parse on malformed input; the message gives the line and column.
• JSON::Value A parsed JSON document, its variants named as Rust's serde_json names them. A Number holds any number: an Int, an Integer when too large for an Int (kept exact), or a Float when it has a fraction or an exponent. Inside the enum the names are the variants: the types are ::Bool, ::String and so on.

Constants

Class methods

JSON.parse(" null ")       # => JSON::Value::Null
JSON.parse("[1,")          # raises JSON::ParseError
JSON.parse("1 2")          # raises JSON::ParseError