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v0.1.0 — Open Source

Schema-driven reports
for the modern web.

Design visually. Render via API. Integrate anywhere.
Open source reporting engine — from JSON to beautiful documents.

Get Started npm install @nextreport/engine

How it works // schema + data → rendered document

Input — JSON Schema report.json

{
  "type": "report",
  "locale": "tr-TR",
  "bands": [
    { "type": "header" },
    { "type": "detail", "dataBinding": "items" },
    { "type": "footer" }
  ]
}

Engine

invoice-v1.html Page 1 / 1

Acme Corp

Technology Solutions

Invoice #INV-001

12.04.2026

Item	Qty	Amount
Laptop Pro 16"	1	₺45.000
Wireless Mouse	3	₺2.250
USB-C Hub	2	₺2.400
Total		₺49.650

Components // hover to select

Visual Designer

Three-panel WYSIWYG editor. Drag & drop, live preview, undo/redo.

ready

Headless API

Stateless REST API. Send JSON, get HTML or PDF. Any language.

ready

Runtime Viewer

React component. Pagination, zoom, print, PDF export built-in.

ready

JSON Schema DSL

Human-readable, version-controllable, AI/LLM-friendly report definitions.

zod v4

Expression Engine

formatCurrency, formatDate, sum, count, if — locale-aware functions.

9 functions

Pluggable Output

HTML + PDF built-in. Add CSV, Excel, DOCX without touching core.

html + pdf

Quick Start // 5 lines of code

5 lines to your first report Install, import, render. No configuration needed.

app.ts

// npm install @nextreport/engine
import { renderReport, renderToHtml } from '@nextreport/engine'

const ir   = renderReport(schema, data)    // JSON → IR
const html = renderToHtml(ir)              // IR → HTML
const pdf  = await renderToPdf(html)       // HTML → PDF

Any language, one API

curl -X POST http://localhost:3000/api/render \
  -H 'Content-Type: application/json' \
  -d '{ "templateId": "invoice-v1", "data": {...}, "format": "pdf" }'

response = requests.post("http://localhost:3000/api/render", json={
    "templateId": "invoice-v1",{"
"}    "data": {"{"}"companyName": "Acme Corp", "items": [...]{"}"},{"
"}    "format": "pdf"{"
"}{"}"})
pdf_bytes = response.content

HttpResponse response = client.send(
    HttpRequest.newBuilder()
        .uri(URI.create("http://localhost:3000/api/render"))
        .POST(BodyPublishers.ofString(
            "{\"templateId\":\"invoice-v1\",\"format\":\"pdf\"}"))
        .build(),
    BodyHandlers.ofByteArray());
byte[] pdf = response.body();

var response = await client.PostAsJsonAsync("/api/render", new {
    templateId = "invoice-v1",{"
"}    data = new {"{"} companyName = "Acme Corp" {"}"},{"
"}    format = "pdf"{"
"}{"}"});
var pdf = await response.Content.ReadAsByteArrayAsync();

Comparison // rendered as document

We respect every tool on this list — we've used many of them for years.

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Feature Comparison Matrix REF-2026-001

Feature	NextReport	JasperReports	FastReport	Stimulsoft	jsreport	ActiveReportsJS
Open Source	Full	Partial	No	No	Partial	No
Web-Native	Yes	Java	Partial	Yes	Yes	Yes
Visual Designer	WYSIWYG	Desktop	Desktop+Web	Web	Code only	Web
API-First	Yes	No	No	Partial	Yes	Partial
AI/LLM-Ready	JSON DSL	XML	Proprietary	Proprietary	HTML tmpl	Proprietary
React-Native	Yes	None	None	Wrapper	None	Wrapper
Cost	Free	Free/Paid	Paid	Paid	5 free	Paid

Try it in your browser

Edit a JSON schema, see the rendered report instantly. No install required.

Open Playground

Schema-driven reportsfor the modern web.

Visual Designer

Headless API

Runtime Viewer

JSON Schema DSL

Expression Engine

Pluggable Output

Try it in your browser

Schema-driven reports
for the modern web.