v1.28.1

Security

• Bumped axios to ^1.20.0 and adm-zip to ^0.6.1 to resolve
  high-severity npm audit advisories in production dependencies.

v1.28.0

Added

• Added support for using multiple glossaries in text and document translation
  via the glossaryIds option (up to 5 glossary IDs) in TranslateTextOptions
  and DocumentTranslateOptions.
• Added support for style rules in document translation via the styleRule
  option in DocumentTranslateOptions.
• Added support for translation memories in document translation via the
  translationMemory and translationMemoryThreshold options in
  DocumentTranslateOptions.
• Added support for the translation memory management APIs:
  getTranslationMemory(), listTranslationMemorySegments(),
  deleteTranslationMemory(), createTranslationMemoryImport(),
  uploadTranslationMemoryFile(), createTranslationMemoryExport(),
  getTranslationMemoryJob(), isTranslationMemoryJobComplete(), and
  downloadTranslationMemoryExport(), along with the
  importTranslationMemoryFromFilepath() and
  exportTranslationMemoryToFilepath() convenience functions that create the
  job, transfer the TMX file, and wait for the job to finish. Because the API
  detects the file upload asynchronously, an import job keeps reporting
  awaiting_input for a while after the upload; the wait loop polls through
  that status and accepts an optional timeoutMs to bound the wait.
• Added the TranslationMemorySegments, TranslationMemorySegment,
  TranslationMemoryTargetSegment, TranslationMemorySegmentsOptions,
  TranslationMemoryImport, TranslationMemoryExport, TranslationMemoryJob,
  TranslationMemoryJobResult, and TranslationMemoryJobStatus types.
• Added optional creationTime and updatedTime fields to
  TranslationMemoryInfo.

Changed

• Requests to the pre-signed storage URLs used for translation memory import and export now
  go through a separate HTTP client that is constructed without the DeepL Authorization
  header, instead of stripping it per request. Headers supplied via TranslatorOptions.headers
  are no longer sent to those URLs either — only the User-Agent and the per-request
  Content-Type. Proxy settings are unaffected.

Fixed

• The debug log helper no longer crashes when axios error fields return a non-primitive from toString or Symbol.toPrimitive.

Security

• Bumped axios to ^1.19.0, form-data to ^3.0.5, and adm-zip to
  ^0.6.0 to resolve high-severity npm audit advisories in production
  dependencies.

v1.26.0

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

v1.25.0

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.

v1.24.0

Added

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

v1.23.0

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.

v1.22.0

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.

v1.21.0

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.).

v1.20.0

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.

v1.19.0

Added

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