midGraphQL
What is Introspection in GraphQL?
Updated Apr 28, 2026
Short answer
Introspection is the ability to query the GraphQL server for information about its own schema.
Deep explanation
Clients can send queries to special meta-fields (like __schema and __type) to discover what queries, mutations, types, and fields are supported. This powers tools like GraphiQL, Apollo Studio, and automatic code generators.
Real-world example
An IDE plugin reading the API endpoint to provide real-time autocomplete and validation while you type GraphQL queries.
Common mistakes
- Leaving Introspection enabled in production. Malicious actors can download your entire schema to find undocumented or vulnerable endpoints.
Follow-up questions
- How do you disable Introspection?