Format machine values into strings humans can scan instantly. @push.rocks/smartformat is a small ESM TypeScript package that exports the proven pretty-bytes and pretty-ms formatters from one Push Rocks namespace.

Use it when logs, dashboards, CLIs, progress views, test output, or API responses need readable file sizes and durations without custom formatting code.

Issue Reporting and Security

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Installation

pnpm add @push.rocks/smartformat

What You Get

prettyBytes(number, options?) converts bytes or bits into SI or binary-prefixed strings.
prettyMs(milliseconds, options?) converts durations into compact, verbose, colon-style, or precision-focused strings.
Native ESM and TypeScript declarations via the published dist_ts build.
Browser and Node.js compatibility through the package's web build pipeline.

Quick Start

import { prettyBytes, prettyMs } from '@push.rocks/smartformat';

const downloaded = prettyBytes(1337);
// '1.34 kB'

const duration = prettyMs(1337);
// '1.3s'

console.log(`Downloaded ${downloaded} in ${duration}`);
// Downloaded 1.34 kB in 1.3s

You can also import the namespace when that reads better in your codebase:

import * as smartformat from '@push.rocks/smartformat';

smartformat.prettyBytes(42, { signed: true });
// '+42 B'

smartformat.prettyMs(95_500, { colonNotation: true });
// '1:35.5'

Formatting Bytes

prettyBytes is ideal for file sizes, payload sizes, storage usage, upload/download progress, and byte deltas.

import { prettyBytes } from '@push.rocks/smartformat';

prettyBytes(100);
// '100 B'

prettyBytes(1_337);
// '1.34 kB'

prettyBytes(1_024, { binary: true });
// '1 KiB'

prettyBytes(1_337, { bits: true });
// '1.34 kbit'

prettyBytes(42, { signed: true });
// '+42 B'

prettyBytes(1_337, { locale: 'de' });
// '1,34 kB'

Useful prettyBytes options include:

bits: format values as bits instead of bytes.
binary: use binary prefixes like KiB instead of SI prefixes like kB.
signed: include a plus sign for positive values, useful for diffs.
locale: localize number formatting while keeping the unit label stable.
minimumFractionDigits and maximumFractionDigits: control decimal precision.
space and nonBreakingSpace: control spacing between value and unit.
fixedWidth: right-align output for tables, progress bars, and terminal output.

Formatting Durations

prettyMs is built for elapsed time, latency, countdowns, retries, benchmark output, and job runtimes.

import { prettyMs } from '@push.rocks/smartformat';

prettyMs(133);
// '133ms'

prettyMs(1_337);
// '1.3s'

prettyMs(1_337_000_000);
// '15d 11h 23m 20s'

prettyMs(1_335_669_000, { verbose: true });
// '15 days 11 hours 1 minute 9 seconds'

prettyMs(95_500, { colonNotation: true });
// '1:35.5'

prettyMs(100.400080, { formatSubMilliseconds: true });
// '100ms 400µs 80ns'

Useful prettyMs options include:

compact: show only the first unit.
unitCount: limit how many units appear.
verbose: use full unit names.
colonNotation: format durations like a digital timer.
secondsDecimalDigits and millisecondsDecimalDigits: control precision.
separateMilliseconds: show milliseconds as their own unit.
formatSubMilliseconds: include microseconds and nanoseconds.
hideYear, hideYearAndDays, and hideSeconds: tune which units appear.
subSecondsAsDecimals: present sub-second values as decimal seconds.

Practical Examples

CLI Output

import { prettyBytes, prettyMs } from '@push.rocks/smartformat';

const transferredBytes = 48_203_991;
const elapsedMs = 8_451;

console.log(`Synced ${prettyBytes(transferredBytes)} in ${prettyMs(elapsedMs)}`);
// Synced 48.2 MB in 8.5s

Aligned Tables

import { prettyBytes } from '@push.rocks/smartformat';

const rows = [1_000, 10_000, 100_000].map((bytes) => prettyBytes(bytes, { fixedWidth: 8 }));
// ['    1 kB', '   10 kB', '  100 kB']

Human-Friendly Timers

import { prettyMs } from '@push.rocks/smartformat';

const startedAt = Date.now();

// later...
prettyMs(Date.now() - startedAt, { compact: true });
// e.g. '3s'

API

export { prettyBytes, prettyMs };

The exported functions are direct re-exports from pretty-bytes and pretty-ms, so their option objects and runtime behavior match those upstream packages.

Development

pnpm install
pnpm test
pnpm run build

The test suite imports the TypeScript sources directly and verifies the package in the configured @git.zone/tstest environment.

License and Legal Information

This repository contains open-source code licensed under the MIT License. A copy of the license can be found in the LICENSE file.

Please note: The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.

Trademarks

This project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH or third parties, and are not included within the scope of the MIT license granted herein.

Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines or the guidelines of the respective third-party owners, and any usage must be approved in writing. Third-party trademarks used herein are the property of their respective owners and used only in a descriptive manner, e.g. for an implementation of an API or similar.

readme.md

@push.rocks/smartformat