Build and test GraphQL queries against a custom schema. Define types in SDL, write queries or mutations, and get instant mock responses. Everything runs in your browser — no server required.
Schema (SDL)
Define a schema to get started
Query
Write a query and press Run
Response
// Run a query to see results here
About GraphQL Playground
GraphQL is a powerful query language for APIs that gives clients the ability to request exactly the data they need. This playground lets you experiment with GraphQL schemas and queries without setting up a server.
Define your types using SDL (Schema Definition Language), write queries or mutations in the editor, and the tool will validate them against your schema and generate realistic mock responses based on field types.
Features
Define custom schemas with types, queries, and mutations
Validate queries against the schema in real time
Generate mock responses with realistic sample data
Pre-built templates for common GraphQL patterns
Variables support for parameterized queries
Export queries and variables as JSON
100% client-side — your data never leaves your browser
What is GraphQL and how does it differ from REST?▼
GraphQL is a query language for APIs that lets clients request exactly the data they need. Unlike REST, which exposes fixed endpoints returning predefined data structures, GraphQL uses a single endpoint where clients specify the shape and fields of the response. This eliminates over-fetching and under-fetching, reduces the number of network requests, and gives front-end developers more flexibility.
What is a GraphQL schema and SDL?▼
A GraphQL schema defines the types, fields, and relationships available in your API. SDL (Schema Definition Language) is the human-readable syntax used to write schemas. It includes type definitions (type User { id: ID!, name: String }), query entry points (type Query), mutations for write operations (type Mutation), and supports features like enums, interfaces, and input types.
Does this playground make real API requests?▼
No. This GraphQL playground runs entirely in your browser with no server calls. It parses your SDL schema locally, validates queries against the defined types, and generates realistic mock responses based on field types. This makes it ideal for learning GraphQL, prototyping schemas, and testing query structures before connecting to a real API.
Keyboard Shortcuts
Ctrl+Enter Run query Ctrl+Shift+C Copy query Ctrl+L Clear