Why use GraphQL Query Validator?
GraphQL documents are sensitive to braces, directives, and operation names. Parse your query, mutation, or subscription locally to catch syntax errors with line and column hints before they surface as vague 400 responses from your gateway.
Practical tips
- Validate fragments and operations together exactly as the client sends them.
- If variables fail at runtime, ensure declared variables match the operation signature.
- Large documents: split into named operations to isolate parser errors faster.
Common questions
- Does this validate against my schema?
- No. It checks document syntax only. Field existence requires schema-aware tooling such as your GraphQL IDE.
- Why does the server still reject a valid parse?
- Authorization, depth limits, and custom directives can reject otherwise syntactic documents.