Can I get binary (KiB, MiB) units instead of decimal? How?

Yes, you can get binary units (KiB, MiB, etc.) instead of decimal units by using the binary option set to true.

Here's how it works:

import prettyBytes from 'pretty-bytes';

prettyBytes(1024, {binary: true});
//=> '1 KiB'

When you enable the binary option, the library uses binary prefixes instead of SI prefixes. This means:

• Without binary (default): Uses decimal units like kB, MB, GB (base-10, where 1 kB = 1000 bytes)
• With binary: true: Uses binary units like KiB, MiB, GiB (base-2, where 1 KiB = 1024 bytes)

The available binary units are defined in [index.js:L12-L20] as BIBYTE_UNITS and BIBIT_UNITS (if using bits as well).

According to the documentation, this is particularly useful for presenting memory amounts, though it should not be used for presenting file sizes [index.d.ts:L41-L49].

FOLLOW_UPS:

• What does the bits option do in prettyBytes?
• How do I format with a specific number of decimal places?
• Can I use non-breaking spaces in the output?