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
• GitHub Bot
• GitHub Actions
• Docker Image

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.

# CLI
yarn add @graphql-inspector/cli

# Core API for programmatic usage
yarn add @graphql-inspector/core

Compares schemas and finds breaking or dangerous changes.

CLI:

$ graphql-inspector diff OLD_SCHEMA NEW_SCHEMA

API:

import {diff, Change} from '@graphql-inspector/core';

const changes: Change[] = diff(schemaA, schemaB);

Finds similar / duplicated types.

CLI:

$ graphql-inspector similar SCHEMA

API:

import {similar, SimilarMap} from '@graphql-inspector/core';

const similar: SimilarMap = similar(schema, typename, threshold);

Schema coverage based on documents. Find out how many times types and fields are used in your application.

CLI:

$ graphql-inspector coverage DOCUMENTS SCHEMA

API:

import {coverage, SchemaCoverage} from '@graphql-inspector/core';

const schemaCoverage: SchemaCoverage = coverage(schema, documents);

Validates documents against a schema and looks for deprecated usage.

CLI:

$ graphql-inspector validate DOCUMENTS SCHEMA

API:

import {validate, InvalidDocument} from '@graphql-inspector/core';

const invalid: InvalidDocument[] = validate(documentsGlob, schema);

Serves a GraphQL server with faked data and GraphQL Playground

CLI:

$ graphql-inspector serve SCHEMA

✅ Serving the GraphQL API on http://localhost:4000/

Introspects a GraphQL Server and writes the result to a file

CLI:

$ graphql-inspector introspect SCHEMA --write schema.json

✅ Introspection result saved to schema.json

Have a per-repository, self-hosted GraphQL Inspector service or deploy it with Docker.

# install
yarn global add @graphql-inspector/actions

# use

$ graphql-inspector-github

{
  "name": "app",
  "scripts": {
    "precommit": "graphql-inspector introspect schema.js --write schema.graphql && git add schema.graphql"
  },
  "graphql-inspector": {
    "diff": true,
    "schema": {
      "ref": "master",
      "path": "schema.graphql"
    }
  }
}

Get GitHub annotations in your PRs.

Path to a CommonJS or ES Module that exports an object

Example:

graphql-inspector coverage ./src/documents.js ./src/schema.js

Example with TypeScript:

graphql-inspector coverage ./src/documents.ts ./src/schema.ts --require ts-node/register

// String
export default `
  type Query {
    hello: String
  }
`

// GraphQLSchema
export default makeExecutableSchema({...});

// GraphQL Document
export default gql`
  type Query {
    hello: String
  }
`

// IntrospectionQuery result
export default {
  data: {
    __schema: {
      ...
    }
  }
}

Pointer to a Git repository

Example:

graphql-inspector diff git:origin/master:schema.graphql ./schema.graphql

Pattern:

git:ref:path/to/file

Pointer to a GitHub repository

Example:

graphql-inspector coverage ./src/documents.ts github:kamilkisiela/graphql-inspector-example#master:schema.graphql

Pattern:

github:owner/name#ref:path/to/file

GraphQL File

Example:

graphql-inspector coverage documents.js schema.graphql
graphql-inspector coverage documents.js schema.gql

JSON File

Example:

graphql-inspector coverage documents.js introspected-schema.json

URL to a GraphQL endpoint

Example:

graphql-inspector coverage documents.js https://localhost:3000/graphql

Glob pattern

Example:

graphql-inspector validate ./src/**/*.{js,jsx,tsx,graphql} https://localhost:3000/graphql

Supports TypeScript, JavaScript and GraphQL Files (Extensions: ts,tsx,js,jsx,graphql,gql,graphqls).

Find out what the CLI is capable of:

graphql-inspector --help
graphql-inspector similar --help

Some part of the library was ported to NodeJS from Ruby's GraphQL Schema Comparator

MIT © Kamil Kisiela