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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.

AI developer workflow fit

Use GraphQL Playground — Schema Validator & Query Formatter while building with AI coding assistants, agents, and LLM workflows: validate generated output, transform payloads, debug integrations, and prepare reliable inputs without leaving your browser.

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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

  1. Paste your GraphQL schema (SDL) in the schema input area. The tool will parse and display available types.
  2. Write a GraphQL query in the query input area.
  3. Click Validate and Format to check the query against the schema and pretty-print it.
  4. Review any validation errors with line numbers.
  5. 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.

FAQ

What problem does GraphQL Playground — Schema Validator & Query Formatter solve?
Free online GraphQL playground. Validate queries against your schema, format GraphQL queries, and inspect schema types. Works offline, no sign-up required.
Can I use GraphQL Playground — Schema Validator & Query Formatter with AI-generated output?
Yes. It is useful for checking, cleaning, converting, or validating examples produced by AI coding assistants before you rely on them in real projects.
Does this tool upload my data?
The tool is designed to run in the browser whenever possible. Tools that require a backend or AI service are labeled separately.