GraphQL Formatter & Validator — Free Online Beautifier — Free

How to use the GraphQL Formatter

Format and validate any GraphQL document in seconds — no installation or account needed.

Paste your GraphQL document

Copy your query, mutation, subscription, or schema definition and paste it into the editor. The tool accepts raw GraphQL SDL and executable documents, including fragments and inline directives.

Validate in real time

As you type or paste, the official graphql-js parser scans your document for syntax errors and highlights the offending line with a descriptive error message. Fix issues immediately rather than waiting for a failed API call.

Copy the formatted output

Once your document is valid, the formatter applies consistent two-space indentation, line breaks after each field selection, and proper brace alignment. Click Copy to grab the clean output and paste it back into your codebase or documentation.

When to use this tool

Use GraphQL Formatter any time readability or correctness of a GraphQL document is in question — from rapid prototyping to code review.

→Cleaning up a minified GraphQL query copied from browser DevTools network tab before sharing it with a teammate.
→Validating a hand-authored schema file for syntax errors before running a schema-first code generation step.
→Formatting a complex nested mutation with fragments so it's legible in a pull request diff.
→Quickly checking whether a GraphQL document received from a third-party API is syntactically valid.
→Preparing GraphQL examples for internal documentation or public API reference pages.
→Debugging a schema stitching issue by formatting each sub-schema side-by-side to spot structural inconsistencies.

Frequently asked questions

Q:What types of GraphQL documents can this formatter handle?

The formatter supports all standard GraphQL document types: queries, mutations, subscriptions, fragments, and Schema Definition Language (SDL) files including type definitions, interfaces, unions, enums, input types, and directives. It uses the same parser as the official graphql-js reference implementation, so coverage matches the GraphQL specification.

Q:How is this different from running Prettier with the prettier-plugin-graphql plugin?

The end formatting result is very similar — both follow the GraphQL spec's recommended style. The key advantage here is zero setup: no Node.js, no config files, no plugin installation. You paste your document and get formatted output instantly in the browser, which makes it ideal for one-off formatting tasks, quick validation, or environments where you can't run local tooling.

Q:Does the validator check semantic correctness, or only syntax?

The real-time validation checks syntax only — it will catch malformed documents like unclosed braces, invalid field names in isolation, or illegal characters. Semantic validation (e.g., querying a field that doesn't exist on a given type) requires your actual schema, which this tool doesn't require you to upload. For full semantic checks, use a schema-aware tool like GraphiQL or your IDE's GraphQL extension.

Q:Can I format a very large GraphQL schema with hundreds of types?

Yes. The formatter runs entirely in your browser with no payload size limits imposed by a server. Performance depends on your device, but typical large schemas with several hundred type definitions format in well under a second on modern hardware.

Q:Is the formatting style configurable (e.g., tab width or brace style)?

The current version applies the community-standard two-space indentation used by graphql-js and Prettier's GraphQL plugin, which is the style expected in the vast majority of GraphQL codebases. Configurable formatting options are on the roadmap for a future release.

Q:Is my GraphQL schema safe to paste here — could it be logged or stored?

Your schema and queries are processed entirely client-side in your browser using the graphql-js WASM/JS bundle. Nothing is sent to a backend server, and nothing is stored or logged. It is safe to paste internal schemas, proprietary type definitions, or sensitive query structures.