> For the complete documentation index, see [llms.txt](https://www.i18next.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.i18next.com/misc.md).

# Misc

- [JSON Format](https://www.i18next.com/misc/json-format.md): The i18next JSON formats v1 to v4: plural and context suffixes, nesting and arrays, and how to convert between versions.
- [Creating own Plugins](https://www.i18next.com/misc/creating-own-plugins.md): Write your own i18next plugin: backend, language detector, post processor, i18n format, formatter or third-party module, with the required interface for each.
- [Migration Guide](https://www.i18next.com/misc/migration-guide.md): Breaking changes and migration steps for every major i18next release, from v19 to v26.
- [The history of i18next](https://www.i18next.com/misc/the-history-of-i18next.md): How i18next started in 2011, why version 2 became framework-independent, and why the maintainers built Locize when i18n alone was not enough.
- [Testimonials](https://www.i18next.com/misc/testimonials.md): What developers and companies say about i18next, and who runs it in production.