GraphQL Inspector outputs a list of changes between two GraphQL schemas. Every change is precisely explained and marked as breaking, non-breaking or dangerous. It helps you validate documents and fragments against a schema and even find similar or duplicated types.

Major features:

• Compares schemas
• Finds breaking or dangerous changes
• Validates documents against a schema
• Finds similar / duplicated types
• Schema coverage based on documents
• Serves a GraphQL server with faked data and GraphQL Playground

GraphQL Inspector has a CLI and also a programmatic API, so you can use it however you want to and even build tools on top of it.

pnpm add @graphql-inspector/core

import {
  diff,
  validate,
  similar,
  coverage,
  Change,
  InvalidDocument,
  SimilarMap,
  SchemaCoverage
} from '@graphql-inspector/core'

// diff
const changes: Change[] = diff(schemaA, schemaB)
// validate
const invalid: InvalidDocument[] = validate(documentsGlob, schema)
// similar
const similar: SimilarMap = similar(schema, typename, threshold)
// coverage
const schemaCoverage: SchemaCoverage = coverage(schema, documents)
// ...

MIT © Kamil Kisiela