qdrant
You are an expert in Qdrant, the high-performance vector search engine written in Rust. You help developers build semantic search, RAG retrieval, recommendation systems, and anomaly detection with billion-scale vector collections, advanced filtering, multi-vector support, and hybrid search — providing sub-millisecond query latency with rich payload filtering that other vector DBs can't match.
What this skill does
# Qdrant — Vector Search Engine
You are an expert in Qdrant, the high-performance vector search engine written in Rust. You help developers build semantic search, RAG retrieval, recommendation systems, and anomaly detection with billion-scale vector collections, advanced filtering, multi-vector support, and hybrid search — providing sub-millisecond query latency with rich payload filtering that other vector DBs can't match.
## Core Capabilities
### Collections and Points
```typescript
import { QdrantClient } from "@qdrant/js-client-rest";
const client = new QdrantClient({ url: "http://localhost:6333" });
// Create collection
await client.createCollection("products", {
vectors: {
size: 1536, // OpenAI embedding dimension
distance: "Cosine",
},
optimizers_config: { indexing_threshold: 10000 },
});
// Upsert points with payload
await client.upsert("products", {
points: [
{
id: "prod-1",
vector: embedding1, // Float array [0.1, -0.3, ...]
payload: {
name: "Wireless Keyboard",
price: 79.99,
category: "electronics",
tags: ["wireless", "bluetooth", "ergonomic"],
in_stock: true,
rating: 4.5,
},
},
{
id: "prod-2",
vector: embedding2,
payload: {
name: "USB-C Hub",
price: 49.99,
category: "accessories",
tags: ["usb-c", "hub", "multiport"],
in_stock: true,
rating: 4.2,
},
},
],
});
```
### Search with Filtering
```typescript
// Semantic search + payload filters
const results = await client.search("products", {
vector: queryEmbedding,
limit: 10,
filter: {
must: [
{ key: "in_stock", match: { value: true } },
{ key: "price", range: { lte: 100 } },
{ key: "category", match: { value: "electronics" } },
],
should: [
{ key: "rating", range: { gte: 4.0 } },
],
},
with_payload: true,
score_threshold: 0.7, // Minimum similarity
});
results.forEach((r) => {
console.log(`${r.payload.name} — Score: ${r.score.toFixed(3)}, $${r.payload.price}`);
});
// Recommendation (find similar to these, but NOT similar to those)
const recommended = await client.recommend("products", {
positive: ["prod-1", "prod-3"], // Find similar to these
negative: ["prod-7"], // But NOT similar to this
limit: 5,
filter: { must: [{ key: "in_stock", match: { value: true } }] },
});
// Scroll (iterate over all points)
const batch = await client.scroll("products", {
filter: { must: [{ key: "category", match: { value: "electronics" } }] },
limit: 100,
with_payload: true,
with_vectors: false,
});
```
### Named Vectors (Multi-Vector)
```typescript
// Collection with multiple vector spaces
await client.createCollection("articles", {
vectors: {
title: { size: 384, distance: "Cosine" }, // Title embedding
content: { size: 1536, distance: "Cosine" }, // Content embedding
},
});
// Search by title similarity
const byTitle = await client.search("articles", {
vector: { name: "title", vector: titleEmbedding },
limit: 10,
});
// Search by content similarity
const byContent = await client.search("articles", {
vector: { name: "content", vector: contentEmbedding },
limit: 10,
});
```
## Installation
```bash
npm install @qdrant/js-client-rest
# Server
docker run -p 6333:6333 -p 6334:6334 qdrant/qdrant
```
## Best Practices
1. **Payload filtering** — Filter BEFORE vector search; Qdrant optimizes this path for fast filtered search
2. **Payload indexes** — Create indexes on frequently filtered fields; `PUT /collections/{name}/index`
3. **Named vectors** — Use multiple vectors per point for different aspects (title, content, image)
4. **Score threshold** — Set `score_threshold` to skip low-quality results; reduces noise
5. **Quantization** — Enable scalar or product quantization for 4x memory reduction; minimal quality loss
6. **Batch upsert** — Send points in batches of 100-1000; parallel upload for faster indexing
7. **Recommendations** — Use positive/negative examples for "more like this" without generating embeddings
8. **Qdrant Cloud** — Managed hosting with free tier; or self-host with Docker for full control
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