GraphQL Schema Formatter (SDL)

Table of Contents

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.

How to Use

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.

Features

• 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
• Comment Preservation – 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