biguint‑format is a Node.js library that converts arbitrarily‑large unsigned integers—provided as Buffers, byte‑arrays, or hex strings—into precise decimal, binary, octal or hexadecimal string representations without the rounding errors of JavaScript’s native numbers. It offers options for endianness, grouping, delimiters, prefixes and padding, making it useful for developers who need to display or log very large integer values accurately.