string-conv

A lightweight, zero-dependency TypeScript utility for string case conversion, inspection, and manipulation. Convert strings between 18+ formats, detect case styles with validation guards, and use robust utilities for everyday string tasks. Works in both JavaScript and TypeScript projects.

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Features

• ✅ Zero dependencies — Extremely lightweight.
• ✅ Full TypeScript Support — Built-in type declarations included.
• ✅ Hybrid Package — Works seamlessly with ESM (import) and CommonJS (require).
• ✅ Robust Case Handling — Handles edge cases like multiple spaces, special characters, and mixed-case inputs.
• ✅ Case Detection — Identify case styles programmatically.
• ✅ Advanced Utilities — Built-in support for HTML stripping, palindromes, truncation, and more.

Installation

npm install string-conv

Usage

TypeScript / ESM

import {
  // Case transforms
  toUpperCase,
  toLowerCase,
  toTitleCase,
  toSentenceCase,
  toCamelCase,
  toPascalCase,
  toSnakeCase,
  toKebabCase,
  toConstantCase,
  toDotCase,
  toSlug,
  fromSlug,
  toInverseCase,
  toReverseCase,
  toTrainCase,
  toPathCase,
  toFlatCase,
  toHeaderCase,
  toSpongeCase,
  // Inspection
  detectCase,
  isCamelCase,
  isPascalCase,
  isSnakeCase,
  isKebabCase,
  isConstantCase,
  isDotCase,
  isTrainCase,
  isPathCase,
  // Utilities
  truncate,
  wordCount,
  charCount,
  countOccurrences,
  reverseWords,
  trimWords,
  padStart,
  padEnd,
  stripHtml,
  isPalindrome,
  escapeHtml,
} from "string-conv";

JavaScript (CommonJS)

const {
  toUpperCase,
  toLowerCase,
  toTitleCase,
  toSentenceCase,
  toCamelCase,
  toPascalCase,
  toSnakeCase,
  toKebabCase,
  toConstantCase,
  toDotCase,
  toSlug,
  fromSlug,
  toInverseCase,
  toReverseCase,
  toTrainCase,
  toPathCase,
  toFlatCase,
  toHeaderCase,
  toSpongeCase,
  detectCase,
  isCamelCase,
  isPascalCase,
  isSnakeCase,
  isKebabCase,
  isConstantCase,
  isDotCase,
  isTrainCase,
  isPathCase,
  truncate,
  wordCount,
  charCount,
  countOccurrences,
  reverseWords,
  trimWords,
  padStart,
  padEnd,
  stripHtml,
  isPalindrome,
  escapeHtml,
} = require("string-conv");

---

API — Case Transforms

toUpperCase(str: string): string

Converts a string to UPPERCASE.

toUpperCase("hello world"); // => "HELLO WORLD"

toLowerCase(str: string): string

Converts a string to lowercase.

toLowerCase("HELLO WORLD"); // => "hello world"

toTitleCase(str: string): string

Converts to Title Case (first letter of each word capitalized).

toTitleCase("hello world"); // => "Hello World"

toSentenceCase(str: string): string

Capitalizes only the first character.

toSentenceCase("hello world"); // => "Hello world"

toCamelCase(str: string): string

toCamelCase("hello world"); // => "helloWorld"

toPascalCase(str: string): string

toPascalCase("hello world"); // => "HelloWorld"

toSnakeCase(str: string): string

toSnakeCase("hello world"); // => "hello_world"

toKebabCase(str: string): string

toKebabCase("hello world"); // => "hello-world"

toConstantCase(str: string): string

toConstantCase("hello world"); // => "HELLO_WORLD"

toDotCase(str: string): string

toDotCase("hello world"); // => "hello.world"

toInverseCase(str: string): string

Inverts character casing.

toInverseCase("Hello World"); // => "hELLO wORLD"

toReverseCase(str: string): string

Reverses characters.

toReverseCase("hello"); // => "olleh"

toTrainCase(str: string): string

toTrainCase("hello world"); // => "Hello-World"

toPathCase(str: string): string

toPathCase("hello world"); // => "hello/world"

toFlatCase(str: string): string

toFlatCase("Hello World"); // => "helloworld"

toHeaderCase(str: string): string

toHeaderCase("content type"); // => "Content-Type"

toSpongeCase(str: string): string

toSpongeCase("hello"); // => "hElLo" (random)

---

API — Inspection

detectCase(str: string): CaseType

Detects the case style of a string.

detectCase("helloWorld"); // => "camelCase"

Possible values: "camelCase", "PascalCase", "snake_case", "kebab-case", "CONSTANT_CASE", "dot.case", "path/case", "Train-Case", "Title Case", "UPPERCASE", "lowercase", "unknown".

Validation guards

Boolean checks for specific styles: isCamelCase, isPascalCase, isSnakeCase, isKebabCase, isConstantCase, isDotCase, isTrainCase, isPathCase.

---

API — Utilities

stripHtml(str: string): string

Removes HTML tags.

stripHtml("<p>Hello <b>World</b></p>"); // => "Hello World"

isPalindrome(str: string, ignoreSpaces?: boolean): boolean

isPalindrome("racecar"); // => true

escapeHtml(str: string): string

escapeHtml("<b>Hi</b>"); // => "&lt;b&gt;Hi&lt;/b&gt;"

truncate(str: string, maxLength: number, suffix?: string): string

truncate("Hello, World!", 8); // => "Hello..."

wordCount(str: string): number

wordCount("hello world"); // => 2

reverseWords(str: string): string

reverseWords("hello world"); // => "world hello"

trimWords(str: string): string

Collapses internal whitespace.

trimWords("  hello   world  "); // => "hello world"

---

Quick Reference Table

Function	Input	Output
toUpperCase	"hello world"	"HELLO WORLD"
toLowerCase	"HELLO WORLD"	"hello world"
toTitleCase	"hello world"	"Hello World"
toSentenceCase	"hello world"	"Hello world"
toCamelCase	"hello world"	"helloWorld"
toPascalCase	"hello world"	"HelloWorld"
toSnakeCase	"hello world"	"hello_world"
toKebabCase	"hello world"	"hello-world"
toConstantCase	"hello world"	"HELLO_WORLD"
toDotCase	"hello world"	"hello.world"
toInverseCase	"Hello World"	"hELLO wORLD"
toTrainCase	"hello world"	"Hello-World"
toPathCase	"hello world"	"hello/world"
toFlatCase	"Hello World"	"helloworld"

---

License

MIT © Chetan Nada