data-api-builder-multisource

What problem does it solve?

Configure a single Data API Builder (DAB) instance to serve multiple databases by partitioning configs into a parent and per-database child configs, merging all entities into a unified API surface without code.

Core Features & Use Cases

• Single DAB instance serving REST, GraphQL, and MCP across multiple databases.
• Separate child configs per database containing their own data-source and entities, with a merged API surface.
• GraphQL can query across databases; REST and MCP expose entities from all sources in a unified namespace.
• Uses environment variables for per-database connections and supports mixing database types.

Quick Start

Create a parent dab-config.json listing all child configs via data-source-files, add per-database dab-config-*.json files, supply the required environment variables, and start DAB to expose multi-database APIs.