@cr4yfish/entity-db-fixed
RepositoryFreeEntityDB is an in-browser vector database wrapping indexedDB and Transformers.js
Capabilities6 decomposed
client-side vector embedding generation with transformers.js
Medium confidenceGenerates dense vector embeddings directly in the browser using Transformers.js, eliminating the need for external embedding APIs. The system downloads pre-trained transformer models (e.g., all-MiniLM-L6-v2) to the client and runs inference locally, converting text into high-dimensional vectors suitable for semantic search and similarity matching without exposing data to remote servers.
Integrates Transformers.js directly into an IndexedDB-backed vector store, enabling end-to-end client-side embeddings without requiring a separate embedding service or API calls. The architecture caches model weights in IndexedDB to avoid re-downloading on subsequent sessions.
Provides true offline embedding capability with zero data transmission, unlike Pinecone or Weaviate which require cloud infrastructure, and simpler than self-hosting Ollama or LM Studio while maintaining privacy guarantees.
persistent vector storage with indexeddb backend
Medium confidenceStores embeddings and associated metadata in the browser's IndexedDB, providing a structured, queryable vector database that persists across browser sessions. The system manages object stores for entities, embeddings, and metadata with automatic indexing on vector similarity and entity IDs, enabling efficient retrieval without server-side persistence.
Wraps IndexedDB with a vector-aware schema that automatically indexes embeddings and provides similarity-based querying, bridging the gap between traditional key-value IndexedDB and specialized vector databases. Uses object stores with compound indexes for efficient entity + embedding lookups.
Lighter-weight than running a full vector database like Milvus or Qdrant in the browser, and requires no backend infrastructure unlike cloud-based solutions, though with lower query performance and storage limits.
semantic similarity search across stored embeddings
Medium confidenceImplements vector similarity search by computing cosine distance or other distance metrics between a query embedding and all stored embeddings in IndexedDB, returning ranked results sorted by similarity score. The search operates entirely client-side without external APIs, using efficient distance computation optimized for browser JavaScript execution.
Performs similarity search entirely within IndexedDB queries without requiring a separate search engine, using JavaScript distance computation optimized for browser execution. Integrates tightly with the embedding generation pipeline to ensure consistent vector spaces.
Simpler integration than Elasticsearch or Milvus for small-scale use cases, and maintains privacy by avoiding external search services, though with worse scaling characteristics than specialized vector databases with approximate nearest neighbor indexing.
entity-centric data organization with metadata association
Medium confidenceOrganizes stored data around entities (documents, records, etc.) with associated metadata (title, source, timestamp, custom fields) and their corresponding embeddings, using a normalized schema where entities are linked to embeddings via foreign keys in IndexedDB. This structure enables efficient retrieval of both vector and non-vector attributes in a single query.
Structures IndexedDB around entities as first-class objects with embedded metadata, rather than treating embeddings as isolated vectors. This design enables retrieval of full entity context (text, metadata, embedding) in coordinated queries, supporting document-centric RAG workflows.
More flexible than vector-only databases for applications requiring rich metadata, and simpler than relational databases with vector extensions, though without the query optimization and consistency guarantees of dedicated solutions.
batch entity ingestion and embedding generation
Medium confidenceProcesses multiple documents or entities in a single operation, generating embeddings for all items and storing them in IndexedDB with their metadata. The system handles the full pipeline from raw text to persisted vectors, managing model initialization, batch inference, and database writes as a coordinated workflow.
Coordinates the full embedding-to-storage pipeline for multiple documents in a single operation, handling model initialization, batch inference, and IndexedDB writes as an atomic workflow. Optimizes for initial knowledge base population rather than incremental updates.
Simpler than building custom ingestion pipelines with separate embedding and storage steps, though less flexible than specialized ETL tools like Airbyte or custom Python scripts for complex data transformations.
model caching and lazy initialization
Medium confidenceAutomatically downloads and caches transformer models on first use, storing model weights in IndexedDB or browser cache to avoid re-downloading on subsequent sessions. The system implements lazy initialization where models are loaded only when embeddings are first requested, reducing initial page load time while ensuring models are available when needed.
Integrates model caching directly into the vector database layer, automatically persisting downloaded models in IndexedDB alongside embeddings. This design eliminates the need for separate model management infrastructure while keeping the API simple.
More integrated than manual model management with Transformers.js, and avoids repeated downloads unlike stateless embedding APIs, though without the sophisticated caching and versioning of production ML serving systems like TensorFlow Serving.
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓privacy-conscious developers building client-side RAG applications
- ✓teams building offline-first web applications with semantic search
- ✓developers prototyping embedding-based features without backend infrastructure
- ✓single-page application developers building offline-capable knowledge bases
- ✓teams building browser-based note-taking or document management tools
- ✓developers prototyping vector search features without backend databases
- ✓developers building client-side RAG pipelines with local context retrieval
- ✓teams implementing semantic search in offline-first applications
Known Limitations
- ⚠Model download on first use can be 50-200MB depending on model size, causing initial latency
- ⚠Embedding generation is CPU-bound and slower than server-side inference (typically 100-500ms per document on consumer hardware)
- ⚠Limited to smaller, quantized transformer models that fit in browser memory (typically <500MB)
- ⚠IndexedDB storage quota is typically 50-100MB per origin in most browsers, limiting total embeddings to ~50k-100k documents depending on embedding dimension
- ⚠No built-in replication or sync mechanism — data is isolated to a single browser/device
- ⚠Query performance degrades with large datasets (>100k embeddings) due to lack of specialized indexing structures like HNSW
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EntityDB is an in-browser vector database wrapping indexedDB and Transformers.js
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