nyasa

See who is really in the browser — humans, scripted automation, headless runtimes, and LLM-style agents leave different traces. nyasa collects behavioral, fingerprint, and network signals in the page, runs client-side detection rules, and posts a structured payload to your endpoint so you can score or route the session.

browser-sdk · behavioral-signals · bot-detection · llm-agents · fraud-adjacent

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The problem

Automation does not announce itself. Bots and agents often look like a normal browser session once traffic reaches your API. You lose timing and environment detail that only exists on the client. nyasa runs in the page: it attaches collectors across the document and your chosen container, evaluates detections locally, and uses sendBeacon to forward a payload you can score or route—without asking visitors for extra steps.

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What you get

Area	What
Identity, not intent	Surfaces who or what is likely operating the session. Business and risk rules stay on your side.
Documented signals	Behavioral, fingerprint, and network pillars described in the docs—so you know what each field implies.
Flows beyond a single form	Attach to a wrapper element (checkout, login, onboarding, agent surface) or scale up; many collectors already run at document scope.
Two ways to load	ESM for bundlers and an IIFE build for a script tag (Quickstart).
Try it live	Docs, API reference, and an interactive demo at nyasa-beta.vercel.app.

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Documentation

Start here → Quickstart · Docs home · Demo

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Install

npm install @devanshhq/nyasa

Package: @devanshhq/nyasa ·

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Minimal example

import { collect } from "@devanshhq/nyasa";

// Pass a form, a div around a wizard, a section, or document.body — see Quickstart.
const handle = collect("#your-flow-root", {
  endpoint: "https://your-api.example.com/ingest",
  sessionId: crypto.randomUUID(),
});

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Monorepo

Path	Role
apps/sdk/	Published @devanshhq/nyasa — npm run build → dist/ (ESM + IIFE + types)
apps/web/	Next.js — marketing site, /docs, /demo

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Development

npm install
npm run web        # site + docs + demo
npm run build      # SDK only
npm run typecheck  # all workspaces