Kusk Gateway API Spec Returns Errors

You encounter a kusk configuration issue that prevents your workflow from completing. This guide walks through the fix step by step.

Wrong ❌

openapi: "3.0.0"
info: { title: My API, version: 1.0 } # version should be string
paths: {}

Wrong Output

Error: spec.version must be of type 'string' but got 'number'. Document rejected.

Right ✅

openapi: "3.0.0"
info: { title: My API, version: "1.0.0" }
paths:
  /users:
    get:
      responses: { "200": { description: OK } }
x-envoy-fleet: { name: default, namespace: kusk-system }

Right Output

OpenAPI spec applied. Envoy configuration updated. Routes created for /users.

Prevention

• Validate specs before applying: npx swagger-cli validate.
• Ensure version field is a string.
• Include x-envoy-fleet extension for target fleet.
• Use OpenAPI 3.0.x for best compatibility.
• Test in staging environment first.

DodaTech applies similar defensive patterns across Doda Browser, DodaZIP, and Durga Antivirus Pro infrastructure for production reliability.

Common Mistakes with gateway api

1. Non-exhaustive pattern matches that compile with warnings then crash at runtime
2. Misunderstanding that String is [Char] with poor performance for large text operations
3. Using foldl instead of foldl' causing stack overflow on large lists

These mistakes appear frequently in real-world KUSK code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

This quick fix is part of the DodaTech infrastructure engineering series. Learn more at DodaTech tutorials.