[!NOTE] This is one of 210 standalone projects, maintained as part of the @thi.ng/umbrella monorepo and anti-framework.

🚀 Please help me to work full-time on these projects by sponsoring me on GitHub. Thank you! ❤️

• About
  • General
  • Numeric formatters
  • Casing
  • Slugify
  • ANSI
  • Word wrapping
  • Padding / wrapping
  • Indentation
  • Char range presets / lookup tables
  • Units
  • Miscellaneous
• Status
• Installation
• Dependencies
• Usage examples
• API
  • Basic usage examples
• Authors
• License

About

Various (~100) string formatting, word wrapping & utility functions, some higher-order, some memoized.

Partially based on Clojure version of thi.ng/strf.

General

• defFormat / format
• interpolate / interpolateKeys
• escape / unescape
• join / splice / split
• repeat
• stringify

Numeric formatters

• currency / chf / eur / gpb / usd / yen
• radix
• int / intLocale
• float / floatFixedWidth
• maybeParseFloat / maybeParseInt
• percent
• uuid
• vector
• B8 / B16 / B32 - fixed size binary formatters
• U8 / U16 / U24 / U32 / U64 - fixed size hex formatters
• Z2 / Z3 / Z4 - fixed sized zero padded number formatters

Casing

• lower / upper / capitalize
• camel / kebab / snake / upperSnake

Slugify

• slugify / slugifyGH

ANSI

• isAnsi / isAnsiEnd / isAnsiStart
• stripAnsi
• lengthAnsi

Word wrapping

• wordWrap / wordWrapLine / wordWrapLines
• SPLIT_PLAIN / SPLIT_ANSI

Padding / wrapping

• center
• padLeft / padRight
• truncate / truncateLeft / truncateRight
• trim
• wrap

Indentation

• spacesToTabs / spacesToTabsLine
• tabsToSpaces / tabsToSpacesLine

Char range presets / lookup tables

• charRange
• ALPHA / ALPHA_NUM / DIGITS / LOWER / UPPER / HEX
• BOM / ESCAPES / ESCAPES_REV
• WS / PUNCTUATION

Units

• units
• bits / bytes
• grams
• meters
• seconds
• ruler / grid

Miscellaneous

• hstr - Hollerith strings
• computeCursorPos

Status

STABLE - used in production

Search or submit any issues for this package

Installation

yarn add @thi.ng/strings

ESM import:

import * as str from "@thi.ng/strings";

Browser ESM import:

<script type="module" src="https://esm.run/@thi.ng/strings"></script>

JSDelivr documentation

For Node.js REPL:

const str = await import("@thi.ng/strings");

Package sizes (brotli'd, pre-treeshake): ESM: 5.54 KB

Dependencies

• @thi.ng/api
• @thi.ng/errors
• @thi.ng/hex
• @thi.ng/memoize

Note: @thi.ng/api is in most cases a type-only import (not used at runtime)

Usage examples

Eight projects in this repo's /examples directory are using this package:

Screenshot	Description	Live demo	Source
	ASCII art raymarching with thi.ng/shader-ast & thi.ng/text-canvas	Demo	Source
	Large ASCII font text generator using @thi.ng/rdom	Demo	Source
	Basic crypto-currency candle chart with multiple moving averages plots	Demo	Source
	Basic SPA example with atom-based UI router	Demo	Source
	Mastodon API feed reader with support for different media types, fullscreen media modal, HTML rewriting	Demo	Source
	Generative audio synth offline renderer and WAV file export	Demo	Source
	rstream based spreadsheet w/ S-expression formula DSL	Demo	Source
	XML/HTML/SVG to hiccup/JS conversion	Demo	Source

API

Generated API docs

Basic usage examples

import { defFormat, float, percent } from "@thi.ng/strings";

// create a custom string formatter
const fmt = defFormat([
    "Price: ",
    { usd: "$", gbp: "£", eur: "€" },
    float(2),
    " (",
    percent(2),
    " off)"
]);

// use format
fmt("usd", 1.2345, 0.5);
// Price: $1.23 (50.00% off)

fmt("eur", 1.2345, 0.25)
// Price: €1.23 (25.00% off)

Authors

• Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

@misc{thing-strings,
  title = "@thi.ng/strings",
  author = "Karsten Schmidt",
  note = "https://thi.ng/strings",
  year = 2015
}

License

© 2015 - 2025 Karsten Schmidt // Apache License 2.0