easy-string-case

TypeScript library to convert strings between different case formats.

Main Features

• Converts strings between the most common formats: camelCase, PascalCase, snake_case, kebab-case, dot.case, path/case, SCREAMING_SNAKE_CASE, COBOL-CASE, Title Case, Sentence case, UpperCamelCase.
• Does not use any external dependencies. All processing is native and portable.
• Supports input in any format: spaces, dashes, underscores, camelCase, PascalCase, etc.
• Unicode-aware: supports international and accented characters.
• Easy to use and test.

Installation

npm install easy-string-case

Basic Usage

import { StringCase } from 'easy-string-case';

StringCase.toCamelCase('hello world'); // 'helloWorld'
StringCase.toPascalCase('foo_bar-baz'); // 'FooBarBaz'
StringCase.toKebabCase('HelloWorld'); // 'hello-world'
StringCase.toSnakeCase('foo-bar baz'); // 'foo_bar_baz'
StringCase.toDotCase('snake_case-example'); // 'snake.case.example'
StringCase.toPathCase('FooBarBaz'); // 'foo/bar/baz'
StringCase.toScreamingSnakeCase('helloWorld'); // 'HELLO_WORLD'
StringCase.toCobolCase('snake_case'); // 'SNAKE-CASE'
StringCase.toTitleCase('mixedCASE input'); // 'MixedCASE Input'
StringCase.toSentenceCase('THIS_IS_A_TEST'); // 'This is a test'
StringCase.toUpperCamelCase('hello world'); // 'HelloWorld'

API

Main Methods

All methods are static and take a single argument: the string to convert.

StringCase.toCamelCase(str: string): string

Converts to camelCase. Example: "hello world" → "helloWorld"

StringCase.toPascalCase(str: string): string

Converts to PascalCase (UpperCamelCase). Example: "foo_bar-baz" → "FooBarBaz"

StringCase.toKebabCase(str: string): string

Converts to kebab-case. Example: "HelloWorld" → "hello-world"

StringCase.toSnakeCase(str: string): string

Converts to snake_case. Example: "foo-bar baz" → "foo_bar_baz"

StringCase.toDotCase(str: string): string

Converts to dot.case. Example: "snake_case-example" → "snake.case.example"

StringCase.toPathCase(str: string): string

Converts to path/case. Example: "FooBarBaz" → "foo/bar/baz"

StringCase.toScreamingSnakeCase(str: string): string

Converts to SCREAMING_SNAKE_CASE. Example: "helloWorld" → "HELLO_WORLD"

StringCase.toCobolCase(str: string): string

Converts to COBOL-CASE. Example: "snake_case" → "SNAKE-CASE"

StringCase.toTitleCase(str: string): string

Converts to Title Case. Example: "mixedCASE input" → "MixedCASE Input"

StringCase.toSentenceCase(str: string): string

Converts to Sentence case. Example: "THIS_IS_A_TEST" → "This is a test"

StringCase.toUpperCamelCase(str: string): string

Converts to UpperCamelCase (PascalCase). Example: "hello world" → "HelloWorld"

Advanced Examples

StringCase.toCamelCase('XML_http-request'); // 'xmlHttpRequest'
StringCase.toPascalCase('foo-bar_baz qux'); // 'FooBarBazQux'
StringCase.toKebabCase('some Text@ with spêcial#char'); // 'some-text-with-special-char'
StringCase.toSnakeCase('  hello  world  '); // 'hello_world'
StringCase.toDotCase('foo_bar.baz-qux'); // 'foo.bar.baz.qux'
StringCase.toPathCase('foo_bar.baz-qux'); // 'foo/bar/baz/qux'
StringCase.toScreamingSnakeCase('some Text@ with spêcial#char'); // 'SOME_TEXT_WITH_SPECIAL_CHAR'
StringCase.toCobolCase('foo-bar.baz_qux'); // 'FOO-BAR-BAZ-QUX'
StringCase.toTitleCase('foo-bar.baz_qux'); // 'Foo Bar Baz Qux'
StringCase.toSentenceCase('foo-bar.baz_qux'); // 'Foo bar baz qux'
StringCase.toUpperCamelCase('foo-bar.baz_qux'); // 'FooBarBazQux'

Implementation

The main logic is in two classes:

• CommonCase: Normalizes the input string into an array of "words" using Unicode rules, common separators, and camelCase/PascalCase detection. This allows all methods to work correctly regardless of the original format.
• StringCase: Exposes static methods to convert between the different formats, using CommonCase normalization.

No external dependencies are used. All code is pure and portable TypeScript.

Tests

The library includes unit tests with Jest for all methods and relevant cases. You can run them with:

npm run test

License

MIT