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The Knowledge base API gives you programmatic access to the documents that power your agent’s knowledge base. YYou can use it to create, retrieve, update, and delete documents, as well as manage their metadata and individual chunks.

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Endpoints

EndpointDescription
Document
GETSearch documentsRetrieve all documents in a project, or filter by type, page, and limit.
GETGet documentFetch a single document by ID, including its chunks and metadata.
POSTCreate documentAdd a new document to the knowledge base from a URL or integration source.
POSTUpload table documentUpload structured table data as a knowledge base document, with optional chunking and LLM processing settings.
PUTReplace documentReplace an existing document’s source and metadata entirely.
PATCHUpdate chunk metadataUpdate the metadata on a specific chunk within a document.
PATCHUpdate chunk metadata by chunk IDUpdate the metadata associated with the specified document chunk
DELDelete documentPermanently remove a document from the knowledge base by ID.

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Documents

Documents are the content sources your agent draws from when answering questions. Each document has a type — URL, PDF, DOCX, plain text, CSV, XLSX, or table — and is processed into chunks that get indexed for retrieval. You can create documents from a URL or external integration, upload structured table data directly, or replace an existing document entirely when its source changes. URL documents support a refreshRate setting (daily, weekly, monthly, or never) that controls how often Voiceflow re-fetches and re-indexes the content.

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Chunks and metadata

When a document is processed, it’s split into chunks — smaller segments of content that are individually indexed and retrieved during conversations. You can update the metadata on a specific chunk to add context that improves retrieval accuracy without modifying the document itself.