vercel-labs__json-render/packages/ink

@json-render/ink

Ink terminal renderer for json-render. Turn JSON specs into interactive terminal UIs.

Installation

npm install @json-render/ink @json-render/core ink react

Peer dependencies: ink ^6.0.0 and react ^19.0.0.

Quick Start

1. Create a Catalog

import { defineCatalog } from "@json-render/core";
import { schema } from "@json-render/ink/schema";
import {
  standardComponentDefinitions,
  standardActionDefinitions,
} from "@json-render/ink/catalog";

export const catalog = defineCatalog(schema, {
  components: standardComponentDefinitions,
  actions: standardActionDefinitions,
});

2. Render a Spec

import { render } from "ink";
import { createRenderer, standardComponents } from "@json-render/ink";
import { catalog } from "./catalog";

const InkRenderer = createRenderer(catalog, standardComponents);

const spec = {
  root: "heading",
  elements: {
    heading: {
      type: "Heading",
      props: { text: "Hello from the terminal!", level: "h1" },
      children: [],
    },
  },
};

render(<InkRenderer spec={spec} state={{}} />);

Standard Components

Layout

Component	Description
Box	Flexbox layout container (like a terminal <div>)
Text	Text output with optional styling (color, bold, italic, etc.)
Newline	Inserts one or more blank lines
Spacer	Flexible empty space that expands to fill available room

Content

Component	Description
Heading	Section heading (h1–h4)
Divider	Horizontal separator line with optional title
Badge	Small colored inline label for status
Spinner	Animated loading spinner with optional label
ProgressBar	Horizontal progress bar (0–1)
Sparkline	Inline sparkline chart using Unicode blocks
BarChart	Horizontal bar chart with labels and values
Table	Tabular data display with headers and rows
List	Bulleted or numbered list
ListItem	Structured list row with title, subtitle, leading/trailing
Card	Bordered container with optional title
KeyValue	Key-value pair display
Link	Clickable URL
StatusLine	Status message with colored icon
Markdown	Renders markdown-formatted text with terminal styling

Interactive

Component	Description
TextInput	Text input field with two-way binding
Select	Selection menu navigated with arrow keys
MultiSelect	Multi-selection with space to toggle, enter to confirm
ConfirmInput	Yes/No confirmation prompt
Tabs	Tab bar navigation with left/right arrow keys

Generate AI Prompts

const systemPrompt = catalog.prompt({ system: "You are a terminal assistant." });

Streaming

Use useUIStream to progressively render specs from JSONL patch streams:

import { useUIStream } from "@json-render/ink";

const { spec, send, isStreaming } = useUIStream({ api: "/api/generate" });

Key Exports

Export	Purpose
createRenderer	Create an all-in-one renderer component from a catalog
Renderer	Low-level spec renderer
JSONUIProvider	Combined provider (state, visibility, validation, actions, focus)
standardComponents	Pre-built component implementations for all standard components
schema	Ink element tree schema
useStateStore	Access state context (state, get, set, update)
useStateValue	Get single value from state
useBoundProp	Two-way binding for $bindState/$bindItem expressions
useUIStream	Stream specs from an API endpoint
createStateStore	Create a framework-agnostic in-memory StateStore

Catalog Entry Points

Entry Point	Exports
@json-render/ink	Components, renderer, hooks, providers
@json-render/ink/schema	schema, InkSchema, InkSpec
@json-render/ink/catalog	standardComponentDefinitions, standardActionDefinitions
@json-render/ink/server	Server-safe re-exports (schema + catalog, no React dependency)

Documentation

• API Reference
• Renderers Overview
• Ink Chat Example