JSON

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data = json['[1, 2, 3]']
log[data[0]]
obj = json['{"name": "crow", "n": 3}']
log[obj.name]
log[int[obj.n] + 1]
log[encode[[1, 2, 3]]]
bad = json['not json']
log[bad.ok]
log[bad.kind]

1
crow
4
[1,2,3]
false
parse

Strings are inert outside backtick interpolation, so JSON braces and double quotes need no escaping. A parsed field is open-schema data: convert it with int[], float[], or str[] before arithmetic — the conversion is an error value if the field isn't what you expected.

Text for a header or a URL

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pair = 'ada:secret'
coded = encode[pair, 'base64']
log['Basic `coded`']
log[decode[coded, 'base64']]
log[encode['crow & more', 'url']]
bad = decode['not base64!', 'base64']
log[bad.kind]

Basic YWRhOnNlY3JldA==
ada:secret
crow%20%26%20more
parse

Given a scheme, encode writes text so something else can carry it — base64 for an authorization: Basic … header, 'url' for one piece of a URL — and decode reads it back. request and the readers encode a query and a form themselves.

Reference: spec section 11 (JSON), and Encodings.