> ## Documentation Index
> Fetch the complete documentation index at: https://docs.responsivevoice.org/llms.txt
> Use this file to discover all available pages before exploring further.

# API Reference

Reference documentation generated from the TypeScript source of each published package. For
install instructions and a first working example, start with
[Installation](/getting-started/installation/).

## Pick a package

Most projects need exactly one of these two.

- [@responsivevoice/core](/api/core/src/) — Text-to-speech in the browser. Native voices with automatic server fallback, streaming, and the web player. This is the package behind the CDN bundle.
- [@responsivevoice/api-client](/api/api-client/src/) — REST client for the ResponsiveVoice API. Use it from Node.js or any server-side runtime, where the Web Speech API does not exist.

## Supporting packages

These ship as dependencies of the packages above, so you rarely install them directly.

- [@responsivevoice/features](/api/features/src/) — The page-level speech features — web player, speak-on-select, paragraph navigation, and the rest. core re-exports all of them.
- [@responsivevoice/types](/api/types/src/) — Zod schemas and the TypeScript types inferred from them. api-client re-exports the common ones.
- [@responsivevoice/text](/api/text/src/) — Text chunking, duration estimation, and normalization shared by the packages above.

## Other references

- [REST API](/rest-api/) — The HTTP endpoints themselves — call them from any language.
- [Browser Support](/guides/browser-support/) — Minimum browser and Node.js versions for each package.