{
  "name": "The Free I Ching open data catalog",
  "url": "https://thefreeiching.com/data/index.json",
  "human_page": "https://thefreeiching.com/data",
  "updated": "2026-10-07",
  "how_to_cite": "The Free I Ching, https://thefreeiching.com/data, licensed CC BY 4.0",
  "datasets": [
    {
      "name": "The 64 hexagrams",
      "description": "King Wen number, English name, Chinese name, upper and lower trigram, line pattern, nuclear, inverse and opposite hexagram, and a short contemporary judgment for each of the 64 hexagrams.",
      "license": "CC BY 4.0",
      "license_url": "https://creativecommons.org/licenses/by/4.0/",
      "rows": 64,
      "formats": [
        {
          "format": "json",
          "url": "https://thefreeiching.com/data/hexagrams.json"
        },
        {
          "format": "csv",
          "url": "https://thefreeiching.com/data/hexagrams.csv"
        }
      ]
    },
    {
      "name": "The 8 trigrams",
      "description": "Name, Chinese character, symbol, natural image, quality, family role and line pattern for each of the eight trigrams.",
      "license": "CC BY 4.0",
      "license_url": "https://creativecommons.org/licenses/by/4.0/",
      "rows": 8,
      "formats": [
        {
          "format": "json",
          "url": "https://thefreeiching.com/data/trigrams.json"
        },
        {
          "format": "csv",
          "url": "https://thefreeiching.com/data/trigrams.csv"
        }
      ]
    },
    {
      "name": "Single line change table",
      "description": "For each hexagram and each of its six lines, the relating hexagram you reach when only that line changes (384 rows).",
      "license": "CC BY 4.0",
      "license_url": "https://creativecommons.org/licenses/by/4.0/",
      "rows": 384,
      "formats": [
        {
          "format": "json",
          "url": "https://thefreeiching.com/data/line-changes.json"
        },
        {
          "format": "csv",
          "url": "https://thefreeiching.com/data/line-changes.csv"
        }
      ]
    },
    {
      "name": "Cast probabilities by method",
      "description": "Exact line, changing-line and relating-hexagram probabilities for the yarrow-weighted and three-coin methods, worked out by enumerating all 4,096 line combinations.",
      "license": "CC BY 4.0",
      "license_url": "https://creativecommons.org/licenses/by/4.0/",
      "rows": 2,
      "formats": [
        {
          "format": "json",
          "url": "https://thefreeiching.com/data/cast-probabilities.json"
        }
      ]
    },
    {
      "name": "Changing-line texts (third party, CC0)",
      "description": "The six line texts for each hexagram from the CC0 translation by Jess Hewitt and Claude, derived from Richard Wilhelm. Third-party text, public domain dedication.",
      "license": "CC0 1.0",
      "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
      "rows": 384,
      "formats": [
        {
          "format": "json",
          "url": "https://thefreeiching.com/data/hexagram-lines.json"
        },
        {
          "format": "csv",
          "url": "https://thefreeiching.com/data/hexagram-lines.csv"
        }
      ]
    }
  ]
}