GraphQL Playground — Schema Validator & Query Formatter
Free online GraphQL playground. Validate queries against your schema, format GraphQL queries, and inspect schema types. Works offline, no sign-up required.
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
- Paste your GraphQL schema (SDL) in the schema input area. The tool will parse and display available types.
- Write a GraphQL query in the query input area.
- Click Validate and Format to check the query against the schema and pretty-print it.
- Review any validation errors with line numbers.
- Copy 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.