GraphQL Schema Diff Checker

How to use this developer tool

1. Paste the two sdl schemas separated by --- or load the built-in sample.
2. Adjust any available option for this analysis.
3. Select Compare Schemas or press Ctrl/Cmd + Enter.
4. Review the summary and download the output if needed.

What this developer tool does

GraphQL Schema Diff Checker produces a focused result from the supplied GraphQL material. The output panel is formatted for copying, while the counters provide a compact review of what was detected.

Results are syntax-oriented. When deployment safety matters, confirm the output with the GraphQL implementation and schema used by your server.

Example

Input

type Query { user(id: ID!): User }
type User { id: ID! name: String }
---
type Query { user(id: ID!): User users: [User!]! }
type User { id: ID! displayName: String }

Result

Run the sample to see the exact generated output and counts.

Use cases

• Review generated client operations before committing them.
• Prepare a concise inventory for documentation or code review.
• Investigate a query or schema without connecting to an endpoint.

Tips for reliable output

• Use complete operation or type definitions where possible.
• Keep fragment definitions in the same document as their operations.
• Compare downloaded output before replacing source files.
• Use the server schema for final compatibility checks.

Processing details

Parsing is performed with balanced-delimiter scanning and task-specific GraphQL token patterns. Strings are skipped while matching braces so braces inside values do not close a selection set.

This browser utility does not execute resolvers, contact an endpoint, or perform full validation against a GraphQL schema.