@graphql-inspector/core

What is @graphql-inspector/core?

@graphql-inspector/core is a powerful tool for GraphQL schema management. It helps developers detect changes, validate schemas, and compare different versions of GraphQL schemas. This package is particularly useful for maintaining the integrity of GraphQL APIs over time.

What are @graphql-inspector/core's main functionalities?

Schema Comparison

This feature allows you to compare two GraphQL schemas and detect changes between them. The code sample demonstrates how to use the `diff` function to find differences between an old schema and a new schema.

const { diff } = require('@graphql-inspector/core');
const oldSchema = `type Query { hello: String }`;
const newSchema = `type Query { hello: String, goodbye: String }`;
const changes = diff(oldSchema, newSchema);
console.log(changes);

Schema Validation

This feature helps you validate a GraphQL schema to ensure it adheres to the GraphQL specification. The code sample shows how to use the `validate` function to check a schema for errors.

const { validate } = require('@graphql-inspector/core');
const schema = `type Query { hello: String }`;
const errors = validate(schema);
console.log(errors);

Schema Coverage

This feature allows you to check how well your GraphQL queries cover your schema. The code sample demonstrates how to use the `coverage` function to analyze the coverage of a schema based on provided documents.

const { coverage } = require('@graphql-inspector/core');
const schema = `type Query { hello: String }`;
const documents = [{ content: `{ hello }` }];
const result = coverage(schema, documents);
console.log(result);

Other packages similar to @graphql-inspector/core

graphql

The `graphql` package is the reference implementation of GraphQL for JavaScript. It provides the core functionality for building GraphQL schemas and executing queries. While it does not offer schema comparison or validation out of the box, it is a fundamental building block for any GraphQL-related tool.

graphql-tools

The `graphql-tools` package provides a set of utilities for building and manipulating GraphQL schemas. It includes features for schema stitching, mocking, and schema transformations. While it overlaps with some of the functionality of @graphql-inspector/core, it is more focused on schema construction and manipulation rather than inspection and validation.

apollo-server

The `apollo-server` package is a popular GraphQL server implementation that includes tools for schema creation, query execution, and performance monitoring. It provides some validation and schema management features, but its primary focus is on serving GraphQL APIs rather than inspecting and comparing schemas.

README

GraphQL Inspector

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.

Features

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.

Installation

pnpm add @graphql-inspector/core

Examples

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)
// ...

License

MIT © Kamil Kisiela