JSON to UBJSON online converter: https://dmitry-ra.github.io/ubjson-test-suite/json-converter.html

You can use hash URLs to load data: https://dmitry-ra.github.io/ubjson-test-suite/json-converter.html#{"arr":[1,2.5,3]}

Block-notation (formalized) representation to UBJSON online converter: https://dmitry-ra.github.io/ubjson-test-suite/blocks-parser.html

Block-notation hash URL: https://dmitry-ra.github.io/ubjson-test-suite/blocks-parser.html#[{][i][i:3][S:arr][\[][i][i:1][d][d:2.5][i][i:3][\]][}]

UBJSON discussion board: https://github.com/thebuzzmedia/universal-binary-json/issues