Online GraphQL Schema Viewer & SDL Inspector
Open, inspect, and analyze GraphQL Schema Definition Language (.graphql, .gql) files in your browser. Root query audits, type hierarchy exploration, input validation, and 100% in-memory client privacy.
- user(id: ID!): User
- products(limit, category): [Product!]!
- orders(status): [Order!]!
- createProduct(input): Product!
- updateOrderStatus(orderId, status): Order!
- id: ID!
- name: String!
- email: String!
- role: UserRole!
- orders: [Order!]!
- id: ID!
- title: String!
- priceUsd: Float!
- inventory: Int!
- category: ProductCategory!
- id: ID!
- buyer: User!
- items: [Product!]!
- totalAmount: Float!
- status: OrderStatus!
The Complete Guide to GraphQL Schema Definition Language (SDL) & API Type Design
GraphQL is an open-source query language for APIs and a runtime for fulfilling those queries with your existing data. Developed by Meta and maintained by the GraphQL Foundation, GraphQL allows client applications to request precisely the data fields they require, preventing over-fetching and under-fetching.
A GraphQL API is defined by its Schema Definition Language (SDL), specifying strictly typed object types, fields, scalar primitives (String, Int, Float, Boolean, ID), relationships, and execution arguments. The HiFi Toolkit Online GraphQL Schema Viewer parses these definitions into interactive cards, making API documentation and schema reviews fast and intuitive.
Core GraphQL Type System Primitives
How to View and Inspect GraphQL Schemas Online
- Upload File: Click Open GraphQL Schema or paste your
.graphqlSDL code. - Browse Types: Switch to
Types Overviewto inspect fields, arguments, and enums. - Copy Schema: Use the copy button to export clean SDL code for your project.
