Test GraphQL queries with variables. Format queries and variables, and preview formatted responses for development and debugging. Code never leaves your device — formatting and validation run locally in your browser.
Content reviewed October 2026 · About Toolzum
Format GraphQL queries with consistent indentation — fragments, variables, and nested selections normalized for readable, reviewable APIs.
Provides an interactive environment where users can write a regular expression pattern, test it against sample strings, and view real-time match. Code never leaves your device — formatting and validation run locally in your browser.
Test JavaScript template literals live — ${} interpolation, nesting, and escaping, evaluated instantly with instant error highlighting.
Preview font size, line-height, letter-spacing, and weight combos live before committing CSS. Test a 32px/1.5 bold hero in seconds — free, local, no signup.
Measures your internet connection’s download speed and latency by downloading a test file from a CDN. Upload speed is not currently measured.
Paste a GraphQL query and optional JSON variables, then preview the formatted query and expected response structure. It validates syntax and formats the query for readability.
No. The tester formats and validates queries locally. It does not make network requests to GraphQL servers. Use it for query preparation and debugging.
Yes. Paste JSON variables alongside your query. The tester parses both, validates variable types against the query, and shows the complete request as it would be sent.
Yes. If you paste a sample response JSON, it formats and validates it, showing the structure with proper indentation for easy inspection.
No. All testing happens locally in your browser. No query or variable data is sent to any server.
GraphQL Query Formatter
Format GraphQL queries with consistent indentation — fragments, variables, and nested selections normalized for readable, reviewable APIs.
GraphQL Variables Formatter
Format GraphQL variables JSON with validation against query structure. Stop malformed-variables errors before sending — local processing, free, no signup.