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GraphQL Formatter — Pretty-Print Queries, Mutations & SDL

Pretty-print GraphQL queries, mutations, and SDL using the official graphql/language parser.

Free No signup Client-side Privacy friendly Updated

Loading GraphQL parser...

How to use

  1. 1 Paste a GraphQL query, mutation, subscription, or SDL.
  2. 2 Beautify reformats with the official <code class="rounded bg-slate-100 px-1 text-xs dark:bg-slate-800">graphql/language</code> printer.
  3. 3 Minify strips whitespace and comments for compact transport.
  4. 4 Parse errors include the line and column.

Why use this tool

  • Powered by the official <code class="rounded bg-slate-100 px-1 text-xs dark:bg-slate-800">graphql/language</code> parse and print functions — output is canonical SDL.
  • Loaded on demand — the parser only downloads when you start typing.
  • Both directions — beautify for repo, minify for transport.
  • Pure client-side — your query never leaves the browser.

Frequently asked questions

Does this support GraphQL SDL (schema)?

Yes — SDL (Schema Definition Language) is parsed and printed identically. Use it to format full schemas including types, directives, and unions.

Why does the first format take a second?

The GraphQL parser library loads lazily on first input. Subsequent formats are instant.

Will fragments and variables be reordered?

No — the printer preserves your declaration order. Only whitespace and comma layout change.

What is GraphQL Formatter?

A GraphQL Formatter is a tool that pretty-prints GraphQL queries, mutations, and schema definition language using the official graphql/language parser. It parses the input and re-serializes it with consistent indentation and spacing, producing readable, well-structured GraphQL documents in the browser.

Features

AST-based printing

Parses with graphql-js and re-prints from the AST, so output is always syntactically valid.

Queries, mutations & SDL

Formats operations and type definitions alike, including fragments and directives.

100% private

Your GraphQL is parsed on the device and never uploaded.

Example

Input

{ user(id:1){name posts{title}} }

Output

{
  user(id: 1) {
    name
    posts {
      title
    }
  }
}

Common use cases

  1. 1

    Tidy a copied query

    Reformat a one-line or messy GraphQL query into a readable, indented form.

  2. 2

    Clean up SDL

    Normalize a schema file's spacing before committing or reviewing.

  3. 3

    Validate while formatting

    A parse error pinpoints a syntax mistake before you send the query.

Summary

Zerethon's GraphQL formatter pretty-prints queries, mutations, and schema definition language (SDL) using the official graphql-js parser. It parses the document into an AST and re-serializes it with consistent two-space indentation and spacing, so malformed input surfaces as a parse error rather than silently reformatting. Everything runs in your browser.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. GraphQL Formatter runs entirely client-side — no server upload, no logging, no tracking of your input.

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