Parse SDL format schema definitions, visualize types, queries, mutations, and subscriptions
Zero Dependencies Β· Works Offlineπ Import Schema
What Can the GraphQL Schema Viewer Do?
The GraphQL Schema Viewer is a free online developer tool for parsing and visualizing GraphQL Schema definitions. Supports SDL (Schema Definition Language) format input, automatically identifying all type definitions including Object Type, Query, Mutation, Subscription, Enum, Input Type, Interface, and Scalar. After parsing, it displays type structures and field information in intuitive card format with search filtering and category browsing.
Core Features
- SDL Parsing: Automatically parses GraphQL Schema Definition Language, identifying all type definitions and fields
- Type Visualization: Displays all types by category, including field names, types, arguments, and descriptions
- Category Filtering: Browse by Object/Query/Mutation/Subscription/Enum/Input/Interface
- Search: Real-time search by type name or field name to quickly locate target definitions
- Detail Expansion: Click type cards to expand full field lists and argument information
- Drag & Drop Import: Drag .graphql files onto the editor area for automatic parsing
How to Use
1. Paste GraphQL Schema SDL content in the text box, or drag a .graphql file to import.
2. Click "Parse" to automatically identify all type definitions.
3. View type counts in the stats section. Use category tags to filter specific types.
4. Click type cards to expand and view full field lists, arguments, and descriptions.
5. Use the search box to quickly find types or fields. Ctrl+Enter to parse, Ctrl+Shift+C to copy results.
Use Cases
Case 1: API Documentation Review
Frontend developers quickly browse Schema definitions before integrating GraphQL APIs, understanding available queries and type structures.
Case 2: Schema Design Review
Backend teams visually check type relationships and field definitions when designing GraphQL Schemas, ensuring sound design.
Case 3: Learning GraphQL
Beginners parse example Schemas to intuitively understand GraphQL's type system, query entry points, and data relationships.
Case 4: Schema Migration
Developers compare old and new Schemas by quickly viewing type changes, confirming field additions/deletions and type modifications.
Extended Knowledge
The GraphQL Schema is the core of a GraphQL API, defining the type system and operation entry points. SDL is GraphQL's type definition language using concise text syntax. Schemas contain three root operation types: Query (read data), Mutation (modify data), and Subscription (real-time updates). The type system supports Object Type, Interface, Union, Enum, Input Type, and Scalar. Fields can have arguments, ! marks non-null types, and [Type] denotes list types. Introspection queries allow clients to retrieve Schema information at runtime.
What is a GraphQL Schema?
A GraphQL Schema is the API's type definition using SDL to describe data types, query entry points, mutations, and subscriptions as the client-server contract.
What is SDL format?
SDL is GraphQL's type definition language using concise text syntax, e.g., type User { id: ID! name: String! }.
Which GraphQL types are supported?
All standard types: Object Type, Interface, Union, Enum, Input Type, Scalar, and Query/Mutation/Subscription root types.
Is my data safe?
Completely safe. All parsing and display runs locally in your browser. No data is uploaded.
How do I view type details?
Click a type card to expand details showing fields, arguments, return types, and descriptions.
Can I search types?
Yes. Type a type name or field name in the search box for real-time filtering.
Is file drag-and-drop supported?
Yes. Drag a .graphql file onto the editor area to auto-parse.