Schema linting in GraphQL

Introduction

Schema linting helps find mistakes in your GraphQL schema before using it. It keeps your schema clean and easy to understand.

When you write or update a GraphQL schema and want to check for errors.

Before sharing your schema with teammates to ensure it follows rules.

To catch common mistakes like missing types or wrong field names.

When you want to keep your schema consistent and easy to maintain.

Syntax

GraphQL

Use a schema linting tool or command like:

graphql-schema-linter --schema schema.graphql

Or configure linting rules in a config file like .graphqlconfig or .eslintrc.yml

Schema linting tools check your schema file for errors and style issues.

You can customize rules to fit your project's needs.

Examples

Run this command in your terminal to check your schema file for errors.

GraphQL

graphql-schema-linter --schema schema.graphql

Example linting rules you can add to your config file to enforce best practices.

GraphQL

rules:
  - no-unused-types
  - no-anonymous-operations
  - unique-field-definition

Sample Program

This schema defines a simple Query and User type. Running the linting command checks for errors or warnings.

GraphQL

# schema.graphql

type Query {
  hello: String
  user(id: ID!): User
}

type User {
  id: ID!
  name: String
}

# Run linting command:
graphql-schema-linter --schema schema.graphql

Important Notes

Linting helps catch errors early, saving time later.

Always run linting after schema changes.

You can integrate linting into your code editor or build process.

Summary

Schema linting checks your GraphQL schema for mistakes and style issues.

It helps keep your schema clean, consistent, and error-free.

Use linting tools and configure rules to fit your project.