CLI Installation

Install

go install github.com/peteretelej/nasa/cmd/nasa@latest

Verify

nasa --help

Expected output:

Usage: nasa <command> [flags]

Commands:
  apod       Astronomy Picture of the Day
  neo        Near-Earth Object Web Service
  donki      Space Weather (DONKI)
  images     NASA Image and Video Library
  ssd        Small-Body Database (SSD/CNEOS)
  eonet      Earth Observatory Natural Event Tracker

Flags:
  --version  Print version and exit
  --help     Show this help message

API Key

Set your API key via environment variable:

export NASA_API_KEY="your-registered-key"

The CLI also accepts NASAKEY as a fallback. Without either, it uses NASA’s DEMO_KEY (30 requests/hour).

Most commands also accept --api-key to override per-invocation:

nasa apod --api-key="your-key"

Output Formats

All commands default to formatted table output. Add --json for machine-readable JSON:

nasa apod --json
nasa neo feed --json