The developer's guide to API mocking, testing, and test data generation toolshttps://devxtools.dev/en-ushttps://devxtools.dev/blog/why-i-built-mockifyer/https://devxtools.dev/blog/why-i-built-mockifyer/The story behind Mockifyer: record real HTTP traffic, switch scenarios, mock React Native backends and trace calls across services. By its creator.Fri, 16 Oct 2026 00:00:00 GMThttps://devxtools.dev/comparisons/k6-vs-jmeter/https://devxtools.dev/comparisons/k6-vs-jmeter/k6 vs JMeter compared with real scripts: CI thresholds, exit codes, protocols, resource use, distributed load, licensing, plus Locust, Gatling, Artillery.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/comparisons/msw-vs-nock-vs-polly/https://devxtools.dev/comparisons/msw-vs-nock-vs-polly/MSW, Nock and Polly.js compared for JS/TS HTTP mocking: interception model, runtimes, record/replay and 2026 maintenance status, plus which to pick.Wed, 14 Oct 2026 00:00:00 GMThttps://devxtools.dev/comparisons/msw-vs-nock/https://devxtools.dev/comparisons/msw-vs-nock/Compare MSW and Nock with code: browser + Node vs Node-only, native fetch, Jest/Vitest setup, MSW 3 changes, and when to use each, or both.Wed, 14 Oct 2026 00:00:00 GMThttps://devxtools.dev/comparisons/opentelemetry-vs-prometheus/https://devxtools.dev/comparisons/opentelemetry-vs-prometheus/OpenTelemetry vs Prometheus explained: instrumentation standard vs metrics database, push vs pull, OTLP ingestion, and a Node.js setup using both together.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/comparisons/pino-vs-winston/https://devxtools.dev/comparisons/pino-vs-winston/Pino vs Winston compared with code: performance, JSON output, transports, redaction, child loggers, NestJS/Fastify setup and OpenTelemetry correlation.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/comparisons/pollyjs-alternatives/https://devxtools.dev/comparisons/pollyjs-alternatives/Polly.js hasn't had a core release since 2023. Compare record/replay alternatives: nock.back, Talkback, MSW + HAR, Playwright HAR, Mockifyer and more.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/guides/faker-js-test-data-factories/https://devxtools.dev/guides/faker-js-test-data-factories/Generate realistic, deterministic test data in TypeScript with Faker.js and Fishery factories: seeding, traits, associations, MSW mocks and DB seeds.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/guides/keploy-and-mockifyer/https://devxtools.dev/guides/keploy-and-mockifyer/Keploy records backend traffic and replays it as API regression tests. Mockifyer records fetch and axios calls in Node.js and in React Native/Expo. When to use each, and both.Tue, 10 Nov 2026 00:00:00 GMThttps://devxtools.dev/guides/mock-api-calls-jest/https://devxtools.dev/guides/mock-api-calls-jest/Mock API calls in Jest four ways: jest.mock your API module, mock axios, mock fetch, or intercept the network with MSW. TypeScript and Vitest included.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/guides/mock-api-react-native/https://devxtools.dev/guides/mock-api-react-native/Mock APIs in React Native with MSW (Jest and the simulator), plus Mirage, Expo setup, and how mocking works in Detox and Maestro E2E tests.Wed, 14 Oct 2026 00:00:00 GMThttps://devxtools.dev/guides/openapi-mock-server-prism/https://devxtools.dev/guides/openapi-mock-server-prism/Run a Prism OpenAPI mock server from your spec: static vs dynamic examples, Docker, CI, request validation, proxy mode, and when to use Mockoon instead.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/guides/pact-contract-testing-javascript/https://devxtools.dev/guides/pact-contract-testing-javascript/A Pact contract testing example in TypeScript: consumer test, pact file, provider verification, Pact Broker, can-i-deploy, and keeping MSW mocks honest.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/guides/wanderweird-mockifyer-demo/https://devxtools.dev/guides/wanderweird-mockifyer-demo/A walkthrough of the WanderWeird demo: seven Node services and an Expo app recorded and replayed with Mockifyer, plus Atlas and dashboard hop tracing.Wed, 21 Oct 2026 00:00:00 GMThttps://devxtools.dev/observability/datadog-alternatives/https://devxtools.dev/observability/datadog-alternatives/Independent Datadog alternatives: open-source and cheaper options for APM, logs, metrics and errors, with pricing models and an OpenTelemetry-first plan.Thu, 15 Oct 2026 00:00:00 GMThttps://devxtools.dev/testing/best-api-testing-tools/https://devxtools.dev/testing/best-api-testing-tools/Independent list of the best API testing tools for 2026, grouped by job: API clients, CI test frameworks, contract tests, mocking, schema fuzzing and load.Thu, 15 Oct 2026 00:00:00 GMT