Data Visualizer

Terminal ASCII chart toolkit. Create bar charts, sparklines, histograms, and gauges from CSV or JSON data in the terminal.

Terminal data visualization toolkit — create ASCII bar charts, sparklines, histograms, heatmaps, gauges, treemaps from data. Process CSV/JSON files with stats summaries, correlations, normalization, and pivoting. Export to SVG and HTML.

Commands

bar

Draw a horizontal bar chart from label:value pairs.

bash

scripts/script.sh bar "Sales:42" "Revenue:87" "Profit:31"

histogram

Show frequency distribution of numeric values as a histogram.

bash

scripts/script.sh histogram 10 15 20 20 25 30 30 30 35 40

sparkline

Render an inline sparkline chart from a series of values.

bash

scripts/script.sh sparkline 4 8 15 16 23 42 38 29 18 10

heatmap

Display a color-coded heat grid from row/column data.

bash

scripts/script.sh heatmap 3 4 1 5 9 2 8 3 7 4 6 1

treemap

Show proportional blocks for part-to-whole comparisons.

bash

scripts/script.sh treemap "Chrome:65" "Safari:18" "Firefox:10" "Edge:7"

gauge

Display a gauge meter showing a value against a maximum.

bash

scripts/script.sh gauge 73 100 "CPU Usage"

matrix

Render a CSV file as a formatted matrix/table view.

bash

scripts/script.sh matrix data.csv

summarize

Compute min/max/average/median statistics for each numeric column in a CSV file.

bash

scripts/script.sh summarize sales.csv

distribution

Show the value distribution of numeric data in a CSV file across bins.

bash

scripts/script.sh distribution scores.csv 8

correlate

Compute a Pearson correlation matrix across all numeric columns in a CSV file.

bash

scripts/script.sh correlate metrics.csv

normalize

Normalize all numeric columns to 0-1 range and output as CSV.

bash

scripts/script.sh normalize raw_data.csv > normalized.csv

pivot

Group rows by a column and aggregate numeric values (sum, avg, min, max).

bash

scripts/script.sh pivot sales.csv region

from-csv

Auto-visualize a CSV file with summary statistics.

bash

scripts/script.sh from-csv data.csv

from-json

Auto-visualize a JSON file — shows structure, keys, and numeric column summaries.

bash

scripts/script.sh from-json data.json

to-svg

Export CSV data as an SVG bar chart.

bash

scripts/script.sh to-svg sales.csv

to-html

Export CSV data as an HTML table with styling.

bash

scripts/script.sh to-html report.csv

help

bash

scripts/script.sh help

version

bash

scripts/script.sh version

Examples

bash

# Quick terminal charts
scripts/script.sh bar "Q1:120" "Q2:185" "Q3:210" "Q4:170"
scripts/script.sh sparkline 10 20 30 25 40 35 50 45
scripts/script.sh gauge 78 100 "Memory"

# CSV analysis pipeline
scripts/script.sh summarize data.csv
scripts/script.sh correlate data.csv
scripts/script.sh pivot data.csv category

# Export
scripts/script.sh to-svg data.csv
scripts/script.sh to-html data.csv

Configuration

Variable	Required	Description
DATAVIZ_DIR	No	Data directory (default: ~/.local/share/data-visualizer/)

Data Storage

History logged in ~/.local/share/data-visualizer/history.log.

Requirements

• bash 4.0+
• python3 (for CSV processing, correlations, JSON parsing, SVG export)

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