What Is GraphQL?
GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. Unlike REST APIs that return fixed data structures, GraphQL lets clients request exactly the data they need. A GraphQL schema defines the types, queries, and mutations available in an API, using a Schema Definition Language (SDL).
How to Use This GraphQL Playground
- 1Paste your GraphQL schema (SDL) in the schema input area. The tool will parse and display available types.
- 2Write a GraphQL query in the query input area.
- 3Click Validate and Format to check the query against the schema and pretty-print it.
- 4Review any validation errors with line numbers.
- 5Copy the formatted query with the Copy button.
Common Use Cases
Validate Queries Before Deployment
Check that your GraphQL queries are valid against the schema before shipping code.
Format and Clean Queries
Pretty-print messy or minified GraphQL queries for readability.
Explore Schema Structure
Quickly browse available types, fields, and their relationships in a GraphQL schema.
Frequently asked questions
Can I execute queries against a real API?
No. This is an offline schema validator and query formatter. It does not make network requests. For live API queries, use tools like GraphiQL or Apollo Studio.
Do I need a schema to format queries?
No. You can format (pretty-print) queries without a schema. The schema is only needed for validation.