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GraphQL Schema Formatter (SDL)

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GraphQL Schema Formatter

Format and validate your GraphQL Schema Definition Language (SDL) with consistent indentation, proper styling, and syntax highlighting. Paste your schema or upload a .graphql file to instantly clean up type definitions, queries, mutations, and directives.

使い方

Paste your GraphQL SDL schema into the input area or upload a .graphql/.gql file. Click Format to apply consistent formatting with proper indentation. Optionally enable alphabetical sorting for fields and types. The formatter validates your schema syntax and highlights any errors with line numbers.

特徴

SDL Parsing – Handles all GraphQL SDL elements: types, interfaces, unions, enums, inputs, scalars, directives, and schema definitions
Syntax Validation – Reports schema errors with line numbers for quick debugging
Consistent Formatting – Applies 2-space indentation and clean style rules across your entire schema
Syntax Highlighting – Color-coded output for keywords, types, fields, directives, and comments
Alphabetical Sorting – Optionally sort fields and types alphabetically for consistent ordering
コメントの保持 – Keeps your documentation comments and descriptions intact
Federation Support – Preserves @key, @external, and other federation directives
File Download – Export formatted schema as a .graphql file

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What is GraphQL Schema Definition Language (SDL)?

GraphQL SDL is a human-readable syntax for defining GraphQL schemas. It describes the types, fields, queries, mutations, and relationships available in a GraphQL API. SDL files typically use .graphql or .gql extensions and serve as the contract between API providers and consumers.

What is the difference between GraphQL SDL and GraphQL queries?

SDL defines the structure and capabilities of a GraphQL API — the types, fields, and operations available. Queries are requests made against that schema to fetch or modify data. Think of SDL as the blueprint and queries as the instructions that use that blueprint.

What are GraphQL directives and how do they work?

Directives are annotations prefixed with @ that modify the behavior of schema elements. Built-in directives include @deprecated for marking fields as obsolete and @skip/@include for conditional field resolution. Custom directives extend schema capabilities — for example, Apollo Federation uses @key and @external to define entity relationships across services.

Why is consistent schema formatting important in GraphQL projects?

Consistent formatting reduces merge conflicts in version control, makes code reviews faster, and improves readability across teams. When multiple developers contribute to a schema, standardized indentation and ordering prevent unnecessary diffs and make it easier to spot actual changes during pull request reviews.

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