ApiFlux – A Visual Playground to Build and Debug API Workflows

Hi HN I just launched ApiFlux, a visual tool to help backend developers build, connect, and test APIs like nodes in a flowchart – without writing glue code for every integration.

Why I built it: As a backend developer, I often stitched together multiple APIs, transformations, and error handling manually. I wanted something like Postman, but more composable, visual, and better for multi-step workflows. So I built it.

Github Link: https://github.com/complex1/webflow-app

Live: https;//apiflux.in

What it does: Add APIs and logic as nodes.

   Connect APIs using variables across steps.

   Add custom data transforms inline.

   Debug inputs/outputs visually with history.

   Test flows live with real API calls.

   Works locally in browser also.
Under the hood: Built with Node.js, Nginx, and Vue Zero config setup (no login needed)

   Entirely open-source (MIT) — self-hostable

   I'm actively working on:

   Authentication flows

   Team workspaces

   CLI and deployment support
Would love feedback from fellow developers and builders here. Especially interested in your thoughts on: What API debugging or chaining pain points you have

Whether a tool like this fits into your workflow

What you'd need before using it in production

Thanks for reading — happy to answer anything here or on GitHub! https://github.com/complex1/webflow-app

2 points | by Shubham_APIFLUX 1 day ago

1 comments

  • wdb 1 day ago
    Is this a visualiser for the Arazzo spec?
    [-]
    • Shubham_APIFLUX 19 hours ago
      no, ApiFlux is not a visualizer for the Arazzo spec, although it shares a similar philosophy around composing and testing API workflows visually

      Arazzo (if you're referring to the workflow spec concept around JSON-based API orchestration) focuses on defining flow logic in a declarative format — essentially a specification for how APIs interconnect.

      ApiFlux is a visual playground, aimed at backend developers who want to quickly prototype, test, and debug multi-step API flows using a node-based UI (like React Flow). It allows you to:

      Visually build the flow without writing orchestration specs

      Execute and test it in real time

      Transform data mid-flow

      View live inputs, outputs, and errors

      Think of it more like Postman + n8n, but purpose-built for developers testing backend logic, not automations.