Basics

Introduction

When you connect a source to Hasura DDN using a data connector and generate Hasura metadata to represent its resources, the source becomes accessible through a unified GraphQL API. Your Hasura metadata lets you control how the data is exposed and interacted with.

Every data connector supports querying and subscribing to data out-of-the-box. Some connectors also provide auto-generated mutations for inserting, updating, or deleting data. For most connectors without auto-generated mutations, you can define custom native mutations.

Queries, subscriptions, and mutations are exposed as root-level fields, enabling you to fetch, monitor, or modify data directly through the GraphQL API.

Check out connector docs

For questions about the capabilities of individual connectors, check out their reference docs.

The sections below explain how to interact with your data using the GraphQL API.

Learn more

• Queries
• Mutations
• Subscriptions
• Global IDs
• API Versioning
• Apollo Federation
• Errors
• GraphQL Schema Diff