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Secure a GraphQL API: authorization, query cost and evidence
Enforce object and field rights, bound server work and test denial paths.
· 22 min
What this guide helps achieve
- Map the exposed schema
- Exercise permissions
- Bound query cost
- Verify denials
Quick check
- Can one account read another account’s object?
- Does a sensitive field follow its parent’s access decision?
- What do depth, aliases and pagination cost together?
- What details leak through errors?
- Who observes denials and abuse?
Step-by-step method
- 01
Inventory operations
List types, fields, mutations, roles, object owners and sensitive data. Include current client queries and rarely used paths.
Deliverable: operation, role, object and field matrix.
- 02
Test each access decision
Create distinct test accounts and swap object IDs, including nested objects. Resolvers must enforce authorization before returning data.
Deliverable: reproducible allowed and denied cases.
- 03
Bound server work
Measure actual cost of fields and collections. Test depth, breadth, aliases, pagination, batching and time together, then set suitable limits.
Deliverable: cost policy and adversarial query set.
- 04
Reduce unnecessary exposure
Decide on introspection for the context, hide internal error detail and remove fields that reveal more than clients need.
Deliverable: reviewed public configuration and error responses.
- 05
Observe with restraint
Log useful technical identity, operation, cost, denial and correlation while excluding secrets and sensitive arguments. Assign alert ownership.
Deliverable: dashboard and investigation procedure.
- 06
Replay after change
When a field, role or client changes, repeat authorization and load cases. Check old queries that now traverse the revised graph.
Deliverable: regression result and release decision.
Management indicators
| Indicator | What it measures | First action |
|---|---|---|
| Access | Object and field cases denied as expected | Fix the resolver |
| Cost | Heavy queries contained by policy | Adjust fields and limits |
| Errors | Public responses without internal detail | Reduce exposed detail |
| Regression | Client operations replayed after change | Block unintended breakage |
Common pitfalls
- Trusting endpoint access alone
- Limiting depth but ignoring breadth
- Forgetting nested-field authorization
- Logging arguments with sensitive data
Frequently asked questions
Does GraphQL remove ordinary API authorization?
No. Every object and field access still needs an identity and context based decision.
Is disabling introspection sufficient?
No. It may reduce schema exposure but does not fix access or query cost.
Is a depth limit enough?
No. Aliases, breadth, lists and field-specific cost also matter.
Official references
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