API Security Testing

Discover and test your REST and GraphQL endpoints for broken authentication, excessive data exposure, missing rate limiting, and unauthenticated administrative routes.

Business Outcome:Protect the APIs powering your web app, mobile app, and partner integrations from automated scraping and unauthorised data access.

Check My Business Security Book a 1-to-1 UK Demo

Protocols

REST & GraphQL

OWASP API Top 10

Full coverage

Safe mode

Non-mutating probes

Example DetectionMedium

GraphQL Introspection Enabled & Missing Query Depth Limit in Production

Attackers can map every internal query/mutation and craft deeply nested queries that exhaust server CPU.

Verified Remediation Guidance:

const server = new ApolloServer({
  schema,
  introspection: process.env.NODE_ENV !== "production",
  validationRules: [depthLimit(6)],
});

What API Security Testing Detects

Every check is non-destructive, rate-limited, and verified to eliminate false-positive noise.

Unauthenticated API routes returning sensitive user or tenant records
GraphQL introspection enabled in production exposing full internal schema mutations
Missing rate-limiting headers and brute-force protection on login, OTP, and password reset endpoints
Verbose stack traces and internal database error leakage on malformed JSON payloads
JWT validation flaws (weak signing secrets, missing expiration checks, alg=none acceptance)

How It Works in 3 Steps

Import OpenAPI spec or auto-discover routes

Point HackGuardX at your API gateway or upload an OpenAPI/Swagger or GraphQL schema.

Test authentication & boundary controls

Verify how endpoints respond to missing tokens, expired tokens, and malformed payloads.

Enforce schema validation & rate limits

Implement strict Zod/JSON schema validation and token-bucket rate limiting.

Read our Responsible Testing & Authorisation Policy

Test Your Domain External Posture Now

Safe Passive DNS, TLS & Header Inspection

Non-intrusive public check • Active scanning requires verified ownership

Or test an instant demonstration profile: