Added

• Added support for translation memories in text translation via
  translationMemory and translationMemoryThreshold options in
  translateText().
• Added listTranslationMemories() method to the DeepLClient class for
  listing available translation memories.

Changed

• Bumped axios dependency due to CVE-2025-62718

Fixed

• Fix write tests that broke from language expansion

Added

• Added new language constants from January 2026 API release of 81 new languages.
• Added jsonBody option to SendRequestOptions, enabling JSON-encoded API calls.
• Added support for style rules CRUD endpoints in the DeepLClient class: createStyleRule(), getStyleRule(), updateStyleRuleName(), updateStyleRuleConfiguredRules(), and deleteStyleRule().
• Added support for style rule custom instruction CRUD endpoints in theDeepLClient class: createStyleRuleCustomInstruction(), getStyleRuleCustomInstruction(), updateStyleRuleCustomInstruction(), and deleteStyleRuleCustomInstruction().
  Please refer to the README for usage instructions.

Added

• Added tagHandlingVersion parameter to translateText() to specify which version of the tag handling algorithm to use. Options are v1 and v2.

Added

• Added customInstructions parameter to translateText() to customize translation behavior with up to 10 instructions (max 300 characters each). Only supported for target languages: de, en, es, fr, it, ja, ko, zh and their variants. Note: using the customInstructions parameter will use quality_optimized model type as the default. Requests combining customInstructions and the latency_optimized model type will be rejected.

Added

• Added support for the GET /v3/style_rules endpoint in the client library, the implementation can be found in the DeepLClient class. Please refer to the README for usage instructions
• Added styleId option to translateText() which allows text and document translation with style rules.

Added

• Added extraRequestParameters option to text and document translation methods to pass arbitrary parameters in the request body. This can be used to access beta features or override built-in parameters (such as target_lang, source_lang, etc.).

Added

• Official support for Node.js versions 20, 22 and 24

Fixed

• Fixed document minification/deminification to preserve translated content. Previously, when document minification was enabled, the deminify process would use the original minified file instead of the translated version, causing translations to be lost.
• Fixed handling of documents without media files during translation. The library now correctly processes documents that don't contain embedded media.

Added

• Add new supported language codes to the translation and glossary language types.

Changed

• Upgrade axios lib due to GHSA-jr5f-v2jv-69x6

Added

• Added option to override translate path