jsonantt

jsonantt turns a plain JSON file into a polished Gantt chart image in one command. No code required — describe your project in JSON, run jsonantt, get a PNG.

pip install jsonantt
jsonantt project.json chart.png

What it can do

Gantt chart	Hierarchical task bars with auto-colored phases, milestones, tick marks, and gridlines
Task table	Formatted image table of tasks with optional milestone-only or no-milestone filtering
Compare mode	Side-by-side baseline vs. actual schedule diff in both chart and table form
Burn chart	Funded burn-down chart from any numeric task field (cost, hours, points, …)
Duration scheduling	Tasks defined with duration instead of an end date (days, weeks, months, years)
Dependency chaining	not_before links automatically cascade start dates across tasks and phases
Deep nesting	Unlimited parent/child hierarchy; summary bars auto-span their children
Style control	25+ style fields covering layout, typography, colors, ticks, gridlines, and table appearance

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Getting started

• Quickstart
  • Install
  • Your first chart
  • Adding tick marks and style
  • Using durations instead of end dates
  • Chaining tasks with not_before
  • Render a task table
  • Compare two schedules
  • Burn chart
  • Next steps

Reference

• JSON Reference
  • Top-level fields
  • Task object
  • Minimal example
  • Full skeleton
• Style Guide
  • All fields at a glance
  • Layout
  • Typography
  • Colors
  • Milestones
  • Tick marks and gridlines
  • Table output
  • Full style example
• Command-Line Reference
  • Synopsis
  • Quick reference
  • Modes
  • Gantt chart
  • Task table
  • Compare mode
  • Burn chart
  • Burn table
  • Option reference
  • Exit codes

Walkthroughs

• Examples
  • simple.json — three-year project plan
  • complex.json — five-year engineering roadmap
  • dependencies.json — chained scheduling with not_before
  • Recipes