API Testing · /// Visual Flow Editor
API testing without scripts. Without compromise.
A visual flow editor with 28 node types and OpenAPI import. Author end-to-end API journeys in minutes — replay as load tests AND as continuous synthetic checks. Per knowledge-base §7.2: LoadGen is the only EUC/VDI testing platform we’re aware of with a visual API flow editor — Login VSI, ControlUp, NeoLoad do not ship this.
28 node typesOpenAPI importLoad + monitoring on one engine
Visual flow editor — 28 node types, drag-drop, OpenAPI import.
The Problem
API testing usually means scripts.
Most API testing tools require scripting — Postman collections, k6 JavaScript files, LoadRunner VuGen projects, NeoLoad scripts. The script becomes the asset; the asset becomes the maintenance burden.
Script-as-asset gets brittle.
Scripts depend on environment-specific URLs, hard-coded values, and brittle setup steps. Six months in, the script library is more maintenance than the API it tests.
Load vs monitoring split.
The script that runs as a load test rarely fires as a monitoring check — and vice versa. Two scripts, two tools, two definitions of "working".
Non-developers can’t contribute.
When the API author has to be a developer fluent in the scripting language, the test library lives behind a knowledge wall. Product, QA, and ops teams can’t inspect or extend.
Why no-code API testing matters
Drag, drop, replay. Across modes.
A visual flow with 28 node types — HTTP, REST, SQL, branching, loops, assertions, custom code, OpenAPI import. Author once, replay as load test AND as continuous synthetic check. Non-developers can author flows the same way developers do.
28 node types, drag-drop
HTTP, REST, SQL, branching, loops, assertions, custom code, conditional logic — drag node, connect arrows, save. Flow authoring in minutes, not in a script project.
OpenAPI import
Drop in an OpenAPI / Swagger spec; the flow editor scaffolds operations automatically. Author the user journey across the imported endpoints visually.
Load + monitoring, same flow
The flow authored once replays as a load test AND as a continuous synthetic check. One asset, two operational modes — no re-authoring across tools.
Author once, replay everywhere
The flow that ran as a load test also fires every minute.
Most API tools require separate scripts for load vs monitoring. LoadGen unifies both — the visual flow authored in the editor replays as a load test AND as a continuous synthetic check. One asset library, two operational modes.
- Flow authored visually — replayable as load AND as synthetic monitoring.
- No JavaScript / VuGen script to maintain.
- 28 node types: HTTP, REST, SQL, branching, loops, assertions, custom code, OpenAPI import.
- Same Analytics + AI surface across both modes.
Flow canvas — multi-node visual API journey.
Capability
What ships with API Testing.
Visual flow editor (28 node types)
HTTP, REST, SQL, branching, loops, assertions, custom code, OpenAPI import. Drag-drop authoring, version-controlled flows.
Learn moreAPI debugger
Step through a flow live — see request, response, assertions, branching decisions per node. Debugging without running the full test.
Learn moreOpenAPI scaffolding
Import an OpenAPI / Swagger spec; the flow editor scaffolds operations. Author the user journey across the imported endpoints.
Learn moreLoad + monitoring replay
Same flow runs as load test AND as continuous synthetic monitoring check. No re-authoring across modes.
Learn moreAssertions + alerting
Per-step assertions on response payload, status code, latency. Alerts route to Email / Webhook / SMS / WhatsApp on failure.
Learn moreAnalytics & AI
AI-flagged response-time drift, error-rate anomalies, per-step regression scoring across every API execution.
Learn moreStep-through debugging
See each node execute, live.
The API debugger walks the flow node-by-node — see the request, the response, the assertion result, the branching decision. Debug without running the full test.
- Per-node request / response inspection.
- Assertion results visible inline — no separate test-result viewer.
- Branching decision traces — see why the flow took which path.
- Debug in the editor; deploy the same flow to load + monitoring.
API debugger — per-node step-through.
Outcomes
What no-code API testing looks like.
Before
Scripts
After
Visual flow
Before
Two scripts
After
One flow
Before
Hand-authored
After
Imported
Before
Developer-only
After
Cross-team
Where API testing lives
Three API-testing jobs.
OpenAPI-driven API validation
Import the spec; the flow editor scaffolds operations. Validate the API journey end-to-end across imported endpoints — replay as load AND as monitoring.
See use caseContinuous API monitoring
The same flow that validated the API as a load test fires every minute as a synthetic check. Per-step latency, error rate, response-payload assertion — alerted on regression.
See use caseCI/CD-gated API regression
Wire the flow into the deploy pipeline — block deploys on assertion failure, latency drift, or error-rate regression.
See use caseAuthor an API flow on your own stack.
We’ll drag-drop a flow against your API in the visual editor on a call, fire it as a load test, and walk you through replay as a synthetic monitoring check.
Questions
Frequently asked.
What node types does the flow editor support?
28 node types: HTTP, REST, SQL, branching, loops, assertions, custom code, OpenAPI import, and more. The full library covers end-to-end user journeys across REST APIs, SQL data layers, and HTTP services.
Can the same flow run as load and monitoring?
Yes — that’s the primary design choice. The flow authored once replays as a load test (50–25k vUsers) AND as a continuous synthetic monitoring check (every minute). No re-authoring across modes.
How does OpenAPI import work?
Drop in an OpenAPI / Swagger spec; the flow editor scaffolds operations automatically — each endpoint becomes a node template. Author the user journey across imported endpoints visually.
Can non-developers author flows?
Yes. The visual editor uses drag-drop authoring — product, QA, and ops teams can inspect and extend flows without scripting expertise. Custom-code nodes are available for cases that need them.
What does no-code API testing cost?
API Testing is part of the LoadGen platform. Load Testing tier is €1,099 per week at 50 vUsers; Monitoring is €899 per Agent per month. API Testing is included in the multi-module bundles — quoted on a call.
How does this compare to Postman / k6?
Postman focuses on developer-driven API testing in a desktop client; k6 uses JavaScript scripts. LoadGen ships a visual flow editor (no scripts), replays as load AND monitoring on the same engine, and is integrated with the EUC platform (Citrix HDX + AVD ARM scenarios in the same vendor).
