Termalytics 📊✨

Zero-dependency, modern TypeScript library and CLI for building gorgeous terminal dashboards and visualizations.

termalytics brings high-performance data visualization to your Node.js scripts, CLIs, and servers. Built from scratch with zero runtime dependencies, TypeScript-first types, support for 24-bit Truecolor ANSI, and a powerful sub-pixel Braille canvas.

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Features

• Zero Runtime Dependencies — Tiny footprint, no install bloating.
• Braille Canvas — Renders sub-pixel lines and curves by utilizing the Unicode Braille Patterns block (2×4 pixel density per text cell).
• Horizontal Bar Charts — Smooth fractional block rendering (████▍).
• Modern Color Engine — Support for 24-bit RGB Truecolor and classic 16-color ANSI maps.
• Sparklines & Gauges — Ultra-compact visualizations for inline logs and status lines.
• Box-Drawing Tables & Heatmaps — Structured data tables with alignment controls and truecolor activity matrices.
• Grid Layout Engine — Flexibly compose widgets into responsive multi-panel dashboards.
• CLI Mode — Pipe CSV, JSON, or newlines directly to generate instant charts on standard input.
• Live Mode — Build real-time updating terminal interfaces with cursor control and alternate-screen buffering.

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Installation

Until the npm registry package is published, install the verified GitHub release tarball:

npm install https://github.com/wenn-id/termalytics/releases/download/v1.0.2/termalytics-1.0.2.tgz

For global CLI usage:

npm install -g https://github.com/wenn-id/termalytics/releases/download/v1.0.2/termalytics-1.0.2.tgz

Then verify:

termalytics --help

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Quick Start

1. In Your TypeScript/JavaScript Code

import { lineChart, barChart, gauge, table, Color, wrap } from 'termalytics';

// Line Chart (Multi-series using Braille pixels)
const seriesA = [10, 30, 45, 25, 60, 90, 80];
const seriesB = [50, 48, 55, 60, 30, 20, 45];

console.log(lineChart([seriesA, seriesB], {
  title: "Server Performance",
  width: 60,
  height: 10,
  series: [
    { label: "CPU", color: Color.Cyan },
    { label: "Memory", color: Color.Magenta }
  ]
}));

// Horizontal Bar Chart
console.log(barChart([
  { label: "Node.js", value: 92 },
  { label: "Rust", value: 85 },
  { label: "Go", value: 74 }
], { width: 50, title: "Language Adoption" }));

// Status Gauge
console.log(gauge(75.5, 100, { label: "Disk Usage", width: 30 }));

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2. Using the CLI

Termalytics automatically detects CSV, TSV, JSON, and list formats.

Line Chart

# Feed a JSON array of values
echo '[10, 24, 45, 30, 75, 90, 60]' | termalytics line --title="Hourly Requests"

# Multi-series JSON
echo '{"series": [[5, 15, 30], [25, 20, 10]]}' | termalytics line

Bar Chart

# Line-separated raw values
seq 1 10 | termalytics bar

Bordered Table

# Pipe non-numeric CSV
echo -e "Service,Status,Latency\napi-gw,healthy,12ms\nauth-svc,healthy,8ms\ndb-primary,degraded,45ms" | termalytics table

Sparkline (Inline compact logs)

echo '[20, 45, 90, 50, 30, 80]' | termalytics spark

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Visual Showcase

Multi-Series Line Chart (Braille resolution)

 Server Performance
  ● CPU  ● Memory
    90┤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⡀⠀⠀⠀⠀⠀⠀
      ┤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡠⠔⠊⠉⠑⠤⡀⠀⠀⠀⠀⠀⠀⡠⠔⠊⠁⠈⠢⡀⠀⠀⠀⠀
    60┤⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡠⠊⠀⠀⠀⠀⠀⠀⠈⠢⡀⠀⠀⢀⠔⠁⠀⠀⠀⠀⠀⠀⠑⢄⠀⠀
      ┤⠀⠀⠀⠀⠀⠀⠀⡠⠔⠉⠀⠈⠑⠤⡀⠀⠀⠀⠀⠀⢀⠜⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠢⣀⠔⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠑⢄
    30┤⢀⣀⠀⠀⠀⠀⡰⠁⠀⠀⠀⠀⠀⠀⠈⠑⠤⣀⠀⡠⠊⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
      ┤⠀⠈⠑⠢⢄⡰⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
     0┤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
      └──────────────────────────────────────────────────────────────

Smooth Bar Chart (with fractional steps)

      Rust █████████████████████████████████████▍ 89
        Go ██████████████████████████████▊ 71
TypeScript ████████████████████████████████████████ 95

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API Reference

Charts

lineChart(dataSeries: number[][], opts?: ChartOptions): string

Plots multiple dataset lines using Unicode Braille pixels.

• width: Number of text columns (default 80).
• height: Number of text rows (default 15).
• min/max: Force scale bounds (defaults to data range).
• showAxis: Draw y-axis labels and boundary grid (default true).
• series: Config arrays like { label: string, color: number }.

barChart(data: Array<{ label: string, value: number } | number>, opts?: ChartOptions): string

Creates horizontal bars.

• Automatically normalizes lengths.
• Colors negative values red.

sparkline(data: number[], opts?: { width?: number, color?: number }): string

Renders an inline line chart using 8 distinct vertical block levels ( ▂▃▄▅▆▇█).

gauge(value: number, maxValue: number, opts?: { width?: number, label?: string, color?: number }): string

A progress bar indicator. Scales color automatically from Green (low) to Yellow (medium) to Red (critical).

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Layout & Screen

panel(content: string[], opts?: PanelOptions): string

Draws a border around pre-rendered text lines with configurable title alignment, colors, and inner padding.

grid(cells: string[], opts: GridOptions): string

Arranges multiple panels side-by-side or stacked in rows. Automatically scales panel heights to align cleanly.

liveScreen(opts: ScreenOptions): { stop: () => void }

Switches the terminal to the alternate screen buffer, hides the cursor, and redraws your screen template at the configured refresh rate. Automatically handles SIGINT/SIGTERM interrupts to restore your user's shell cleanly.

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License

MIT License. Designed & developed with 💙 by Alwan Juliawan.