GraphQL Security Basics
GraphQL lets clients ask for exactly the data they want in a single flexible query — and that flexibility creates security challenges REST does not. One endpoint exposes a whole graph of types, queries can nest arbitrarily deep, and clients can batch many operations at once. Securing GraphQL means constraining that power without losing its benefits.
What are the main GraphQL risks?#
| Risk | Cause |
|---|---|
| Denial of service | Deeply nested or complex queries exhaust resources |
| Information disclosure | Introspection reveals the whole schema |
| Broken authorization | Per-field access easy to overlook |
| Rate-limit bypass | Batching many operations in one request |
| Injection | Resolvers passing input to databases unsafely |
The DoS angle is unique to GraphQL’s design: a single query can request friends { friends { friends { ... } } } to explosive depth, so cost must be bounded.
How do you secure a GraphQL API?#
- Limit query depth and complexity — reject queries beyond a cost budget.
- Enforce authorization per field/resolver, not just at the endpoint — the access-control rules still apply to every field.
- Disable introspection in production for non-public APIs.
- Rate-limit by query cost, accounting for batching.
- Validate resolver inputs — GraphQL does not prevent SQL injection inside resolvers.
GraphQL security is API security with extra flexibility to constrain. See also REST API security and the Web Security hub.
Frequently asked questions#
What are the main GraphQL security risks?
Denial of service from deeply nested or complex queries, information disclosure via introspection, broken authorization because a single endpoint exposes many fields, and batching attacks that bypass rate limits. GraphQL’s flexibility — its strength — is also what widens its attack surface compared with fixed REST endpoints.
Should you disable GraphQL introspection in production?
Usually yes for public-facing APIs. Introspection lets clients query the entire schema, which is convenient in development but hands attackers a map of every type and field. Disabling it in production is defense in depth, though it is not a substitute for proper authorization on each field.