LanceDB · JSON Structure

Lancedb Table Structure

JSON Structure for a LanceDB table with strict typed fields covering identity, schema, versioning, and indexing surface.

Type: object Properties: 10 Required: 3

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LancedbTable is a JSON Structure definition published by LanceDB, describing 10 properties, of which 3 are required. It conforms to the https://json-structure.org/draft/2025-09/schema meta-schema.

Properties

name namespace location version createdAt updatedAt schema stats indexes tags

Meta-schema: https://json-structure.org/draft/2025-09/schema

JSON Structure

{
  "$schema": "https://json-structure.org/draft/2025-09/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/lancedb/main/json-structure/lancedb-table-structure.json",
  "name": "LancedbTable",
  "type": "object",
  "description": "JSON Structure for a LanceDB table with strict typed fields covering identity, schema, versioning, and indexing surface.",
  "properties": {
    "name": { "type": "string" },
    "namespace": {
      "type": "array",
      "items": { "type": "string" }
    },
    "location": { "type": "uri" },
    "version": { "type": "int64" },
    "createdAt": { "type": "date-time" },
    "updatedAt": { "type": "date-time" },
    "schema": {
      "type": "object",
      "properties": {
        "fields": {
          "type": "array",
          "items": { "type": { "$ref": "#/definitions/Field" } }
        }
      }
    },
    "stats": {
      "type": "object",
      "properties": {
        "numRows": { "type": "int64" },
        "numFragments": { "type": "int64" },
        "sizeBytes": { "type": "int64" }
      }
    },
    "indexes": {
      "type": "array",
      "items": { "type": { "$ref": "#/definitions/Index" } }
    },
    "tags": {
      "type": "map",
      "values": { "type": "int64" }
    }
  },
  "required": ["name", "namespace", "schema"],
  "definitions": {
    "Field": {
      "type": "object",
      "properties": {
        "name": { "type": "string" },
        "arrowType": { "type": "string" },
        "nullable": { "type": "boolean" },
        "vectorDimension": { "type": "int32" }
      },
      "required": ["name", "arrowType"]
    },
    "Index": {
      "type": "object",
      "properties": {
        "name": { "type": "string" },
        "column": { "type": "string" },
        "indexType": {
          "type": "string",
          "enum": ["BTREE", "BITMAP", "LABEL_LIST", "FTS", "IVF_FLAT", "IVF_PQ", "IVF_HNSW_SQ", "IVF_HNSW_PQ"]
        },
        "metric": {
          "type": "string",
          "enum": ["l2", "cosine", "dot"]
        },
        "status": {
          "type": "string",
          "enum": ["PENDING", "BUILDING", "READY", "FAILED"]
        }
      },
      "required": ["name", "column", "indexType"]
    }
  }
}