How to Monitor GraphQL APIs for Uptime and Availability

GraphQL APIs present unique monitoring challenges compared to REST APIs. A traditional REST API has multiple endpoints, each of which can be monitored individually. A GraphQL API typically exposes a single endpoint (/graphql) that handles all queries — which makes simple uptime checks less informative.

This guide covers how to set up effective GraphQL API uptime monitoring that actually confirms your API is functioning correctly, not just that your server is responding.

The GraphQL Monitoring Challenge

With a REST API, you can set up a GET check on /api/users and know that the users endpoint is up. With GraphQL, all requests go to the same URL — often via POST — and the response is always JSON. A 200 OK response from your GraphQL endpoint doesn't mean your queries are working; it could mean GraphQL received the request but every query is failing with errors.

This means GraphQL monitoring requires a slightly different approach:

1. Basic availability — is the GraphQL endpoint responding at all?
2. Query execution — is the GraphQL engine actually processing queries?
3. Data availability — are the underlying resolvers and data sources working?

Step 1: GraphQL Introspection as a Health Check

Most GraphQL APIs support introspection — a built-in mechanism for querying the schema. You can use an introspection query as a lightweight health check:

{ __typename }

This is the simplest valid GraphQL query. It returns {"data":{"__typename":"Query"}} if GraphQL is functioning. You can send this as a POST request with your monitor:

Request:

POST /graphql
Content-Type: application/json

{"query":"{ __typename }"}

Expected response:

{"data":{"__typename":"Query"}}

Configure your uptime monitor to:

• Send a POST request to your GraphQL endpoint
• Include the above JSON body
• Check for "__typename" in the response body

This confirms GraphQL is processing queries without requiring authentication or real data access.

Step 2: Add a Dedicated GraphQL Health Query

A better approach than using introspection is to add a dedicated health field to your GraphQL schema:

type Query {
  health: HealthStatus!
  # ... your other fields
}

type HealthStatus {
  status: String!
  version: String
}

// Resolver
const resolvers = {
  Query: {
    health: () => ({ status: 'ok', version: process.env.APP_VERSION })
  }
}

Your health query:

{ health { status } }

Point your monitor at this. The health resolver can check database connectivity, cache availability, or any other dependency — returning a non-ok status if something is wrong.

Step 3: Add a REST Health Endpoint Alongside GraphQL

The cleanest solution for monitoring is to add a dedicated REST health endpoint (/health) alongside your GraphQL endpoint. This endpoint:

• Uses a simple GET request (no custom body required)
• Returns 200 OK when everything is fine, 503 when something is wrong
• Can check all dependencies (database, cache, external services)

Most API monitoring tools work best with GET endpoints that return simple status codes. A REST health endpoint gives them exactly that, even if your main API is GraphQL.

Step 4: Monitor Your GraphQL Gateway

If you're using a GraphQL gateway (Apollo Federation, Hasura, Prisma, etc.), the gateway itself is a distinct component that needs monitoring. A gateway that's running but can't connect to its subgraphs will return errors on every query.

Add a health check to your gateway configuration:

• Apollo Server — add apollo-server-plugin-health-check or a custom __typename check
• Hasura — Hasura exposes a built-in /healthz endpoint
• GraphQL Yoga — supports custom health check plugins

Step 5: External HTTP Uptime Monitoring

With your health endpoint or introspection check in place:

• URL: https://yourdomain.com/health (preferred) or https://yourdomain.com/graphql
• Method: GET (for health endpoint) or POST (for introspection check)
• Interval: 1 minute for production
• Content check: verify response body contains expected string

This provides continuous external verification from outside your infrastructure.

Authentication Considerations

Many GraphQL APIs require authentication. Your health query should be unauthenticated — or use a dedicated, read-only monitoring token — so your uptime monitor doesn't need to manage session tokens.

Options:

1. Make the health field publicly accessible without authentication
2. Create a dedicated read-only API key for monitoring purposes
3. Use the __typename introspection approach if your API allows unauthenticated introspection

Monitoring GraphQL Subscriptions

If your GraphQL API uses subscriptions (WebSocket-based real-time updates), these need separate monitoring. A subscription endpoint is typically at /graphql with a WebSocket upgrade. Basic HTTP monitoring won't test WebSocket connectivity.

Consider:

• Monitoring the WebSocket endpoint with a port check on port 443/80
• Adding a health field that reports the subscription server status
• Using heartbeat monitoring on a subscription worker process

SSL and Domain Monitoring

Add SSL certificate monitoring to your GraphQL API's domain — especially important for APIs consumed by third-party clients that may not display user-friendly SSL errors.

Putting It Together

A solid GraphQL monitoring setup:

Domain Monitor supports POST-based HTTP monitoring with custom request bodies and content verification — making it suitable for GraphQL health check monitoring.

Monitor your GraphQL API uptime at Domain Monitor.

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