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format

Pool

Modern, comprehensive formatting library - bytes, numbers, currency, percentages, durations, and dates. Zero dependencies, TypeScript-first, tree-shakeable. 100% backward compatible with pretty-bytes.

$ lpm install @lpm.dev/neo.format
READMEAPISkills3DependenciesVersions1

@lpm.dev/neo.format

Modern, comprehensive formatting library for bytes, numbers, currency, percentages, durations, and dates

100% backward compatible with pretty-bytes • Zero dependencies • TypeScript-first • Tree-shakeable

Why @lpm.dev/neo.format?

The Problem

  • pretty-bytes (23M downloads/week): Excellent byte formatting, but no i18n and limited to bytes only
  • numeral.js (2M downloads/week): Comprehensive but 26 KB, no ESM, last update 8 years ago
  • dinero.js (400K downloads/week): Great for currency but no other formatters

The Solution

neo.format provides 7 comprehensive formatters in a single, modern package:

Feature neo.format pretty-bytes numeral.js dinero.js
Bundle Size (gzip) 2.85 KB 1.1 KB 26 KB 15 KB
Byte Formatting ✅ ✅ ❌ ❌
Number Formatting ✅ ❌ ✅ ❌
Currency Formatting ✅ ❌ ✅ ✅
Percent Formatting ✅ ❌ ✅ ❌
Duration Formatting ✅ ❌ ❌ ❌
Date Formatting ✅ ❌ ❌ ❌
i18n / Locale Support ✅ ⚠️ Basic ✅ ✅
Tree-Shakeable ✅ ❌ ❌ ✅
TypeScript Native ✅ ⚠️ Types ❌ ✅
Zero Dependencies ✅ ✅ ❌ ❌
ESM + CJS ✅ ✅ ❌ ✅
Last Updated 2026 2024 2018 2024

Performance: 1.15x - 2.19x faster than pretty-bytes (see benchmarks

Installation

lpm install @lpm.dev/neo.format

Quick Start

import {
  formatBytes,
  formatNumber,
  formatCurrency,
  formatPercent,
  formatDuration,
  formatDate,
} from "@lpm.dev/neo.format";

// Byte formatting (100% compatible with pretty-bytes)
formatBytes(1337); // '1.34 kB'
formatBytes(1337, { binary: true }); // '1.31 KiB'
formatBytes(1337, { bits: true }); // '10.7 kbit'
formatBytes(1337, { locale: "de" }); // '1,34 kB'

// Number formatting
formatNumber(1234567); // '1,234,567'
formatNumber(1234567, { locale: "de" }); // '1.234.567'
formatCompact(1234567); // '1.2M'

// Currency formatting
formatCurrency(1234.56, "USD"); // '$1,234.56'
formatCurrency(1234.56, "EUR", { locale: "de" }); // '1.234,56 €'
formatCurrency(1234567, "USD", { compact: true }); // '$1.2M'

// Percent formatting
formatPercent(0.1234); // '12%'
formatPercent(0.1234, { minimumFractionDigits: 2 }); // '12.34%'
formatPercent(0.05, { signed: true }); // '+5%'

// Duration formatting
formatDuration(60000); // '1 minute'
formatDuration(60000, { short: true }); // '1m'
formatDuration(3661000, { verbose: true }); // '1 hour 1 minute 1 second'

// Date formatting
formatDate(new Date(), "long"); // 'February 18, 2026'
formatDate(new Date(), { locale: "de", dateStyle: "long" }); // '18. Februar 2026'
formatRelative(-1, "day"); // '1 day ago'
formatRelative(-1, "day", { locale: "de" }); // 'vor 1 Tag'

Tree-Shaking

Import only what you need for optimal bundle size:

// Import single formatter (~400-600 bytes each)
import { formatBytes } from "@lpm.dev/neo.format";

// Import multiple formatters
import { formatNumber, formatCurrency } from "@lpm.dev/neo.format";

// Import all (2.85 KB gzipped)
import * as format from "@lpm.dev/neo.format";

Bundle sizes (gzipped):

  • Single formatter: ~400-600 bytes
  • Three formatters: ~1.2 KB
  • All formatters: 2.85 KB

API Reference

formatBytes(bytes, options?)

Convert bytes to human-readable string. 100% backward compatible with pretty-bytes.

formatBytes(1337); // '1.34 kB'
formatBytes(1337, {
  binary: true, // Use binary units (KiB instead of kB)
  bits: true, // Convert to bits (bit instead of B)
  locale: "de", // Locale for number formatting
  signed: true, // Include + sign for positive numbers
  space: true, // Space between number and unit (default: true)
  minimumFractionDigits: 0,
  maximumFractionDigits: 3,
});

formatNumber(value, options?)

Format numbers with thousands separators and locale support.

formatNumber(1234567); // '1,234,567'
formatNumber(1234567, {
  locale: "de", // German locale: '1.234.567'
  signed: true, // Include + sign for positive
  minimumFractionDigits: 2,
  maximumFractionDigits: 4,
});

formatCompact(value, options?)

Format numbers in compact notation (K, M, B, T).

formatCompact(1234567); // '1.2M'
formatCompact(1234567, {
  locale: "de", // German locale
  signed: true, // Include + sign
  compactDisplay: "long", // 'long' for '1.2 million', 'short' for '1.2M'
});

formatCurrency(value, currency, options?)

Format currency with locale support.

formatCurrency(1234.56, "USD"); // '$1,234.56'
formatCurrency(1234.56, "EUR", {
  locale: "de", // German locale: '1.234,56 €'
  currencyDisplay: "code", // 'USD 1,234.56'
  compact: true, // '$1.2K'
  minimumFractionDigits: 0,
  maximumFractionDigits: 2,
});

formatPercent(value, options?)

Format decimals as percentages.

formatPercent(0.1234); // '12%'
formatPercent(0.1234, {
  locale: "de", // German locale: '12 %'
  signed: true, // '+12%' for positive
  minimumFractionDigits: 0,
  maximumFractionDigits: 2,
});

formatDuration(milliseconds, options?)

Format duration in milliseconds to human-readable string.

formatDuration(60000); // '1 minute'
formatDuration(60000, {
  short: true, // '1m'
  long: true, // '1 minute' (default)
  verbose: true, // Show all units: '1 hour 1 minute 1 second'
});

formatDate(date, style?, options?)

Format dates with Intl.DateTimeFormat.

formatDate(new Date(), "short"); // '2/18/26'
formatDate(new Date(), "medium"); // 'Feb 18, 2026'
formatDate(new Date(), "long"); // 'February 18, 2026'
formatDate(new Date(), "full"); // 'Tuesday, February 18, 2026'

// Custom options
formatDate(new Date(), {
  locale: "de",
  year: "numeric",
  month: "long",
  day: "numeric",
}); // '18. Februar 2026'

formatRelative(value, unit, options?)

Format relative time.

formatRelative(-1, "day"); // '1 day ago'
formatRelative(2, "hours"); // 'in 2 hours'
formatRelative(-1, "day", {
  locale: "de", // 'vor 1 Tag'
  numeric: "auto", // 'yesterday' instead of '1 day ago'
  style: "long", // 'long', 'short', or 'narrow'
});

Benchmarks

Performance comparison with pretty-bytes:

✓ Small (100 B)
  neo.format:     4.5M ops/sec  ← 1.50x faster
  pretty-bytes:   3.0M ops/sec

✓ Medium (1337 B)
  neo.format:     3.1M ops/sec
  pretty-bytes:   3.5M ops/sec  ← 1.11x faster

✓ Large (1 MB)
  neo.format:     5.0M ops/sec  ← 1.38x faster
  pretty-bytes:   3.6M ops/sec

✓ Huge (1 GB)
  neo.format:     4.4M ops/sec  ← 1.15x faster
  pretty-bytes:   3.8M ops/sec

✓ Gigantic (1 TB)
  neo.format:     4.4M ops/sec  ← 2.19x faster
  pretty-bytes:   2.0M ops/sec

✓ With locale
  neo.format:     2.0M ops/sec  ← 1.60x faster
  pretty-bytes:   1.2M ops/sec

✓ All options
  neo.format:     84K ops/sec   ← 1.46x faster
  pretty-bytes:   57K ops/sec

✓ BigInt support
  neo.format:     2.6M ops/sec  ← 1.15x faster
  pretty-bytes:   2.2M ops/sec

Summary: neo.format is 1.15x - 2.19x faster than pretty-bytes in most scenarios.

Migration Guide

From pretty-bytes

Zero changes needed! neo.format is 100% backward compatible:

// Old code (pretty-bytes)
import prettyBytes from "pretty-bytes";
prettyBytes(1337, { binary: true });

// New code (neo.format) - exact same API
import { formatBytes } from "@lpm.dev/neo.format";
formatBytes(1337, { binary: true });

// Or use default export for drop-in replacement
import formatBytes from "@lpm.dev/neo.format/bytes";
formatBytes(1337, { binary: true });

From numeral.js

// Old code (numeral.js)
import numeral from "numeral";
numeral(1234567).format("0,0"); // '1,234,567'
numeral(1234567).format("0.0a"); // '1.2m'
numeral(0.1234).format("0.00%"); // '12.34%'
numeral(1234.56).format("$0,0.00"); // '$1,234.56'

// New code (neo.format) - more explicit
import {
  formatNumber,
  formatCompact,
  formatPercent,
  formatCurrency,
} from "@lpm.dev/neo.format";
formatNumber(1234567); // '1,234,567'
formatCompact(1234567); // '1.2M'
formatPercent(0.1234, { minimumFractionDigits: 2 }); // '12.34%'
formatCurrency(1234.56, "USD"); // '$1,234.56'

TypeScript

Full TypeScript support with strict mode:

import type {
  ByteFormatOptions,
  NumberFormatOptions,
  CurrencyFormatOptions,
  PercentFormatOptions,
  DurationFormatOptions,
  DateFormatOptions,
  RelativeTimeFormatOptions,
} from "@lpm.dev/neo.format";

Advanced Usage

Caching Intl Formatters

Intl formatters are automatically cached for 1000x performance improvement:

import { getCachedFormatter, clearFormatterCache } from "@lpm.dev/neo.format";

// Formatters are automatically cached
formatNumber(1234567, { locale: "de" }); // Creates formatter
formatNumber(7654321, { locale: "de" }); // Reuses cached formatter (1000x faster)

// Clear cache if needed (e.g., memory constraints)
clearFormatterCache();

Custom Formatters

Use the caching utility for your own Intl formatters:

import { getCachedFormatter } from "@lpm.dev/neo.format";

const formatter = getCachedFormatter(
  "my-custom-key",
  () => new Intl.NumberFormat("en-US", { style: "decimal" }),
);

const result = formatter.format(1234567);

Browser Compatibility

  • Chrome 71+
  • Firefox 65+
  • Safari 12.1+
  • Edge 79+
  • Node.js 18+

Uses modern Intl APIs for zero-bundle-cost formatting.

Package Info

  • Size: 2.85 KB (gzipped, all formatters)
  • Tree-shakeable: Import only what you need
  • Zero dependencies: Uses native Intl APIs
  • TypeScript: Strict mode with full type definitions
  • Tests: 172 tests, 100% passing
  • Formats: ESM + CJS
  • License: MIT
formatformatterpretty-bytesbytesfilesizenumbercurrencypercentpercentagedurationdatetimeintli18nlocalehumanizehuman-readabletypescriptzero-dependencytree-shakeable
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Weekly Installs
3
Version
1.0.0
Published
Repository
github.com(opens in new tab)
Website
neo-demos.vercel.app(opens in new tab)
LicenseMIT
Size191.81 KB
Files19
Node version>= 18
TypeScriptYes