Sentence Case

Transform text into Sentence case format where the first word is capitalized and the rest are lowercase, separated by spaces.

🚀 Features

• Lightweight - Only ~450B minified + gzipped
• Type-safe - Full TypeScript support with comprehensive type definitions
• Zero dependencies - No external dependencies
• Tree-shakeable - ES modules support
• Universal - Works in browsers, Node.js, and serverless environments
• Well-tested - Comprehensive test suite with edge cases
• Customizable - Flexible options for advanced use cases

📦 Installation

# npm
npm install text-sentence-case

# yarn
yarn add text-sentence-case

# pnpm
pnpm add text-sentence-case

# bun
bun add text-sentence-case

🎯 Quick Start

import { sentenceCase } from "text-sentence-case";

console.log(sentenceCase("hello world")); // "Hello world"
console.log(sentenceCase("userProfileData")); // "User profile data"
console.log(sentenceCase("backgroundColor")); // "Background color"

📖 Usage

ES Modules (Recommended)

import { sentenceCase } from "text-sentence-case";

console.log(sentenceCase("hello world")); // "Hello world"

CommonJS

const { sentenceCase } = require("text-sentence-case");

console.log(sentenceCase("hello world")); // "Hello world"

TypeScript

import { sentenceCase, Options } from "text-sentence-case";

const result: string = sentenceCase("hello world");
console.log(result); // "Hello world"

🔄 Transformation Examples

Basic Transformations

import { sentenceCase } from "text-sentence-case";

// From different cases
sentenceCase("hello world"); // "Hello world"
sentenceCase("Hello World"); // "Hello world"
sentenceCase("HELLO WORLD"); // "Hello world"
sentenceCase("camelCase"); // "Camel case"
sentenceCase("PascalCase"); // "Pascal case"
sentenceCase("snake_case"); // "Snake case"
sentenceCase("kebab-case"); // "Kebab case"
sentenceCase("dot.case"); // "Dot case"

// Complex examples
sentenceCase("XMLHttpRequest"); // "Xml http request"
sentenceCase("iPhone"); // "I phone"
sentenceCase("version 1.2.3"); // "Version 1 2 3"
sentenceCase("userProfileData"); // "User profile data"

Advanced Options

import { sentenceCase } from "text-sentence-case";

// Custom word splitting
sentenceCase("XMLHttpRequest", {
  splitRegexp: /([a-z])([A-Z])/g,
}); // "Xml http request"

// Custom character stripping
sentenceCase("hello@world.com", {
  stripRegexp: /[@.]/g,
}); // "Hello world com"

// Custom transformation function
sentenceCase("api-v2-endpoint", {
  transform: (word, index) => {
    if (index === 0) {
      if (word === "api") return "API";
      return word.charAt(0).toUpperCase() + word.slice(1).toLowerCase();
    }
    if (word === "v2") return "V2";
    return word.toLowerCase();
  },
}); // "API v2 endpoint"

🌍 Real-World Examples

Content Headings

import { sentenceCase } from "text-sentence-case";

// Article headings
sentenceCase("gettingStarted"); // "Getting started"
sentenceCase("bestPractices"); // "Best practices"
sentenceCase("troubleshooting"); // "Troubleshooting"
sentenceCase("frequentlyAskedQuestions"); // "Frequently asked questions"
sentenceCase("advancedConfiguration"); // "Advanced configuration"

Form Labels

import { sentenceCase } from "text-sentence-case";

// Form field labels
sentenceCase("firstName"); // "First name"
sentenceCase("emailAddress"); // "Email address"
sentenceCase("phoneNumber"); // "Phone number"
sentenceCase("dateOfBirth"); // "Date of birth"
sentenceCase("billingAddress"); // "Billing address"

Error Messages

import { sentenceCase } from "text-sentence-case";

// Error message formatting
sentenceCase("invalidEmailFormat"); // "Invalid email format"
sentenceCase("passwordTooShort"); // "Password too short"
sentenceCase("userNotFound"); // "User not found"
sentenceCase("accessDenied"); // "Access denied"
sentenceCase("sessionExpired"); // "Session expired"

Documentation Sections

import { sentenceCase } from "text-sentence-case";

// Documentation sections
sentenceCase("apiReference"); // "Api reference"
sentenceCase("installationGuide"); // "Installation guide"
sentenceCase("migrationNotes"); // "Migration notes"
sentenceCase("performanceTips"); // "Performance tips"
sentenceCase("securityConsiderations"); // "Security considerations"

Content Processing

import { sentenceCase } from "text-sentence-case";

// Process content titles
const contentSections = [
  "userManagement",
  "dataVisualization",
  "reportGeneration",
  "systemConfiguration",
  "backupAndRestore",
];

const formattedSections = contentSections.map(sentenceCase);
console.log(formattedSections);
// [
//   "User management",
//   "Data visualization",
//   "Report generation",
//   "System configuration",
//   "Backup and restore"
// ]

Notification Messages

import { sentenceCase } from "text-sentence-case";

function formatNotification(type, message) {
  return `${sentenceCase(type)}: ${sentenceCase(message)}`;
}

console.log(formatNotification("successMessage", "dataUpdatedSuccessfully"));
// "Success message: Data updated successfully"

console.log(formatNotification("warningAlert", "sessionWillExpireSoon"));
// "Warning alert: Session will expire soon"

Menu Item Processing

import { sentenceCase } from "text-sentence-case";

const menuItems = [
  { key: "userProfile", icon: "user" },
  { key: "accountSettings", icon: "settings" },
  { key: "billingInformation", icon: "credit-card" },
  { key: "securityOptions", icon: "shield" },
  { key: "privacySettings", icon: "lock" },
];

const formattedMenu = menuItems.map((item) => ({
  ...item,
  label: sentenceCase(item.key),
}));

console.log(formattedMenu);
// [
//   { key: "userProfile", icon: "user", label: "User profile" },
//   { key: "accountSettings", icon: "settings", label: "Account settings" },
//   { key: "billingInformation", icon: "credit-card", label: "Billing information" },
//   { key: "securityOptions", icon: "shield", label: "Security options" },
//   { key: "privacySettings", icon: "lock", label: "Privacy settings" }
// ]

Help Text Generation

import { sentenceCase } from "text-sentence-case";

function generateHelpText(fieldName, validationRule) {
  const field = sentenceCase(fieldName);
  const rule = sentenceCase(validationRule);
  return `${field} ${rule}`;
}

console.log(generateHelpText("emailAddress", "mustBeValidFormat"));
// "Email address must be valid format"

console.log(generateHelpText("password", "mustContainSpecialCharacters"));
// "Password must contain special characters"

Status Message Processing

import { sentenceCase } from "text-sentence-case";

class StatusProcessor {
  static formatStatus(status) {
    return sentenceCase(status);
  }

  static createStatusMessage(action, status) {
    const formattedAction = sentenceCase(action);
    const formattedStatus = sentenceCase(status);
    return `${formattedAction} ${formattedStatus}`;
  }
}

console.log(StatusProcessor.formatStatus("dataProcessingComplete"));
// "Data processing complete"

console.log(StatusProcessor.createStatusMessage("fileUpload", "inProgress"));
// "File upload in progress"

📖 API Reference

sentenceCase(input, options?)

Converts a string to Sentence case format.

Parameters

• input (string): The string to convert
• options (Options, optional): Configuration options

Returns

• string: The Sentence case formatted string

Options

interface Options {
  // Custom transform function for word processing
  transform?: (word: string, index: number, words: string[]) => string;

  // Regex to strip characters before processing
  stripRegexp?: RegExp;

  // Custom split function
  split?: (value: string) => string[];
}

🔧 Advanced Configuration

Custom Word Splitting

import { sentenceCase } from "text-sentence-case";

// Split on specific patterns
sentenceCase("XMLHttpRequest", {
  splitRegexp: /([a-z])([A-Z])/g,
}); // "Xml http request"

// Split on numbers
sentenceCase("user123data", {
  splitRegexp: /([a-zA-Z])(\d)/g,
}); // "User 123 data"

Custom Character Stripping

import { sentenceCase } from "text-sentence-case";

// Strip specific characters
sentenceCase("hello@world.com", {
  stripRegexp: /[@.]/g,
}); // "Hello world com"

// Strip all non-alphanumeric
sentenceCase("hello!@#world", {
  stripRegexp: /[^a-zA-Z0-9]/g,
}); // "Hello world"

Custom Transform Functions

import { sentenceCase } from "text-sentence-case";

// Preserve acronyms in first position
sentenceCase("xml-http-request", {
  transform: (word, index) => {
    const acronyms = ["xml", "http", "api", "url", "html", "css", "js"];
    if (index === 0 && acronyms.includes(word.toLowerCase())) {
      return word.toUpperCase();
    }
    if (index === 0) {
      return word.charAt(0).toUpperCase() + word.slice(1).toLowerCase();
    }
    return word.toLowerCase();
  },
}); // "XML http request"

// Custom business logic
sentenceCase("user-v2-api", {
  transform: (word, index) => {
    if (index === 0) {
      return word.charAt(0).toUpperCase() + word.slice(1).toLowerCase();
    }
    if (word === "v2") return "V2";
    if (word === "api") return "API";
    return word.toLowerCase();
  },
}); // "User V2 API"

📊 Bundle Size

This package is optimized for minimal bundle size:

• Minified: ~450B
• Gzipped: ~250B
• Tree-shakeable: Yes
• Side effects: None

🌍 Browser Support

• Modern browsers: ES2015+ (Chrome 51+, Firefox 54+, Safari 10+)
• Node.js: 12+
• TypeScript: 4.0+
• Bundle formats: UMD, ESM, CommonJS

🧪 Testing

# Run tests
pnpm test

# Run tests in watch mode
pnpm test --watch

# Run tests with coverage
pnpm test --coverage

# Type checking
pnpm typecheck

# Linting
pnpm lint

🔗 Related Packages

• text-title-case - Convert to Title Case
• text-capital-case - Convert to Capital Case
• text-upper-case-first - Make first character uppercase
• text-no-case - Convert to no case
• text-case - All case transformations in one package

📜 License

MIT © Dmitry Selikhov

🤝 Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

🆘 Support

• 📧 Email: selikhov.dmitrey@gmail.com
• 🐛 Issues: GitHub Issues
• 💬 Discussions: GitHub Discussions
• 📖 Documentation: Full Documentation

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Made with ❤️ by Dmitry Selikhov