diff --git a/README.md b/README.md
index cd8d19157..3262ee87c 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,16 @@ Open `http://localhost:4000` in your favorite browser.
 
 If you encounter any issues with the above steps, please refer to the official [Jekyll](https://jekyllrb.com/docs/) documentation and this [guide on running Jekyll as a non-superuser](https://jekyllrb.com/docs/troubleshooting/#no-sudo) for more detailed installation instructions.
 
+## FSF API compatible metadata
+
+The site publishes [`api/licenses.json`](api/licenses.json) at `/api/licenses.json` after build. Regenerate it with:
+
+```bash
+script/generate_fsf_api.rb
+```
+
+The JSON follows the [FSF License Metadata API](https://wking.github.io/fsf-api/licenses-full.json) shape (`@context` + `licenses`), combining choosealicense.com rule tags with FSF identifiers where available.
+
 ## Adding a license
 
 For information on adding a license, see [the CONTRIBUTING file](https://github.com/github/choosealicense.com/blob/gh-pages/CONTRIBUTING.md#adding-a-license).
diff --git a/api/licenses.json b/api/licenses.json
new file mode 100644
index 000000000..0f89ece1d
--- /dev/null
+++ b/api/licenses.json
@@ -0,0 +1,1182 @@
+{
+  "@context": "https://wking.github.io/fsf-api/schema/licenses.jsonld",
+  "licenses": {
+    "0bsd": {
+      "name": "BSD Zero Clause License",
+      "identifiers": {
+        "spdx": [
+          "0BSD"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "liability",
+        "modifications",
+        "private-use",
+        "warranty"
+      ]
+    },
+    "afl-3.0": {
+      "name": "Academic Free License v3.0",
+      "identifiers": {
+        "spdx": [
+          "AFL-3.0"
+        ],
+        "FSF": [
+          "AcademicFreeLicense3.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#AcademicFreeLicense",
+        "http://directory.fsf.org/wiki/License:AFLv3"
+      ]
+    },
+    "agpl-3.0": {
+      "name": "GNU Affero General Public License v3.0",
+      "identifiers": {
+        "spdx": [
+          "AGPL-3.0"
+        ],
+        "FSF": [
+          "AGPLv3.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "network-use-disclose",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#AGPLv3.0",
+        "https://www.gnu.org/licenses/agpl.html"
+      ]
+    },
+    "apache-2.0": {
+      "name": "Apache License 2.0",
+      "identifiers": {
+        "spdx": [
+          "Apache-2.0"
+        ],
+        "FSF": [
+          "apache2"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#apache2",
+        "http://directory.fsf.org/wiki/License:Apache2.0"
+      ]
+    },
+    "artistic-2.0": {
+      "name": "Artistic License 2.0",
+      "identifiers": {
+        "spdx": [
+          "Artistic-2.0"
+        ],
+        "FSF": [
+          "ArtisticLicense2"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ArtisticLicense2",
+        "http://directory.fsf.org/wiki/License:ArtisticLicense2.0"
+      ]
+    },
+    "blueoak-1.0.0": {
+      "name": "Blue Oak Model License 1.0.0",
+      "identifiers": {
+        "spdx": [
+          "BlueOak-1.0.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "warranty"
+      ]
+    },
+    "bsd-2-clause-patent": {
+      "name": "BSD-2-Clause Plus Patent License",
+      "identifiers": {
+        "spdx": [
+          "BSD-2-Clause-Patent"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "warranty"
+      ]
+    },
+    "bsd-2-clause": {
+      "name": "BSD 2-Clause \"Simplified\" License",
+      "identifiers": {
+        "spdx": [
+          "BSD-2-Clause"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "private-use",
+        "warranty"
+      ]
+    },
+    "bsd-3-clause-clear": {
+      "name": "BSD 3-Clause Clear License",
+      "identifiers": {
+        "spdx": [
+          "BSD-3-Clause-Clear"
+        ],
+        "FSF": [
+          "clearbsd"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#clearbsd",
+        "http://directory.fsf.org/wiki/License:ClearBSD"
+      ]
+    },
+    "bsd-3-clause": {
+      "name": "BSD 3-Clause \"New\" or \"Revised\" License",
+      "identifiers": {
+        "spdx": [
+          "BSD-3-Clause"
+        ],
+        "FSF": [
+          "ModifiedBSD"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ModifiedBSD",
+        "http://directory.fsf.org/wiki/License:BSD_3Clause"
+      ]
+    },
+    "bsd-4-clause": {
+      "name": "BSD 4-Clause \"Original\" or \"Old\" License",
+      "identifiers": {
+        "spdx": [
+          "BSD-4-Clause"
+        ],
+        "FSF": [
+          "OriginalBSD"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#OriginalBSD",
+        "http://directory.fsf.org/wiki/License:BSD_4Clause"
+      ]
+    },
+    "bsl-1.0": {
+      "name": "Boost Software License 1.0",
+      "identifiers": {
+        "spdx": [
+          "BSL-1.0"
+        ],
+        "FSF": [
+          "boost"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright--source",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#boost",
+        "http://directory.fsf.org/wiki/License:Boost1.0"
+      ]
+    },
+    "cc-by-4.0": {
+      "name": "Creative Commons Attribution 4.0 International",
+      "identifiers": {
+        "spdx": [
+          "CC-BY-4.0"
+        ],
+        "FSF": [
+          "ccby"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ccby",
+        "http://creativecommons.org/licenses/by/4.0/legalcode"
+      ]
+    },
+    "cc-by-sa-4.0": {
+      "name": "Creative Commons Attribution Share Alike 4.0 International",
+      "identifiers": {
+        "spdx": [
+          "CC-BY-SA-4.0"
+        ],
+        "FSF": [
+          "ccbysa"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ccbysa",
+        "http://creativecommons.org/licenses/by-sa/4.0/legalcode"
+      ]
+    },
+    "cc0-1.0": {
+      "name": "Creative Commons Zero v1.0 Universal",
+      "identifiers": {
+        "spdx": [
+          "CC0-1.0"
+        ],
+        "FSF": [
+          "CC0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#CC0",
+        "http://directory.fsf.org/wiki/License:CC0"
+      ]
+    },
+    "cecill-2.1": {
+      "name": "CeCILL Free Software License Agreement v2.1",
+      "identifiers": {
+        "spdx": [
+          "CECILL-2.1"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "network-use-disclose",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "warranty"
+      ]
+    },
+    "cern-ohl-p-2.0": {
+      "name": "CERN Open Hardware Licence Version 2 - Permissive",
+      "identifiers": {
+        "spdx": [
+          "CERN-OHL-P-2.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "warranty"
+      ]
+    },
+    "cern-ohl-s-2.0": {
+      "name": "CERN Open Hardware Licence Version 2 - Strongly Reciprocal",
+      "identifiers": {
+        "spdx": [
+          "CERN-OHL-S-2.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "warranty"
+      ]
+    },
+    "cern-ohl-w-2.0": {
+      "name": "CERN Open Hardware Licence Version 2 - Weakly Reciprocal",
+      "identifiers": {
+        "spdx": [
+          "CERN-OHL-W-2.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license--library",
+        "warranty"
+      ]
+    },
+    "ecl-2.0": {
+      "name": "Educational Community License v2.0",
+      "identifiers": {
+        "spdx": [
+          "ECL-2.0"
+        ],
+        "FSF": [
+          "ECL2.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ECL2.0",
+        "http://directory.fsf.org/wiki/License:ECL2.0"
+      ]
+    },
+    "epl-1.0": {
+      "name": "Eclipse Public License 1.0",
+      "identifiers": {
+        "spdx": [
+          "EPL-1.0"
+        ],
+        "FSF": [
+          "EPL"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#EPL",
+        "http://directory.fsf.org/wiki/License:EPLv1.0"
+      ]
+    },
+    "epl-2.0": {
+      "name": "Eclipse Public License 2.0",
+      "identifiers": {
+        "spdx": [
+          "EPL-2.0"
+        ],
+        "FSF": [
+          "EPL2"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#EPL2",
+        "http://directory.fsf.org/wiki/License:EPLv2.0"
+      ]
+    },
+    "eupl-1.1": {
+      "name": "European Union Public License 1.1",
+      "identifiers": {
+        "spdx": [
+          "EUPL-1.1"
+        ],
+        "FSF": [
+          "EUPL-1.1"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "network-use-disclose",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#EUPL-1.1",
+        "http://directory.fsf.org/wiki/License:EUPLv1.1"
+      ]
+    },
+    "eupl-1.2": {
+      "name": "European Union Public License 1.2",
+      "identifiers": {
+        "spdx": [
+          "EUPL-1.2"
+        ],
+        "FSF": [
+          "EUPL-1.2"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "network-use-disclose",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#EUPL-1.2",
+        "http://directory.fsf.org/wiki/License:EUPLv1.2"
+      ]
+    },
+    "gfdl-1.3": {
+      "name": "GNU Free Documentation License v1.3",
+      "identifiers": {
+        "spdx": [
+          "GFDL-1.3"
+        ],
+        "FSF": [
+          "FDLv1.3"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "same-license",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#FDL",
+        "https://www.gnu.org/licenses/fdl.html",
+        "https://www.gnu.org/licenses/license-list.html#FDLOther"
+      ]
+    },
+    "gpl-2.0": {
+      "name": "GNU General Public License v2.0",
+      "identifiers": {
+        "spdx": [
+          "GPL-2.0"
+        ],
+        "FSF": [
+          "GPLv2"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "same-license",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#GPLv2",
+        "https://www.gnu.org/licenses/old-licenses/gpl-2.0.html"
+      ]
+    },
+    "gpl-3.0": {
+      "name": "GNU General Public License v3.0",
+      "identifiers": {
+        "spdx": [
+          "GPL-3.0"
+        ],
+        "FSF": [
+          "GNUGPLv3"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#GNUGPLv3",
+        "https://www.gnu.org/licenses/gpl.html"
+      ]
+    },
+    "isc": {
+      "name": "ISC License",
+      "identifiers": {
+        "spdx": [
+          "ISC"
+        ],
+        "FSF": [
+          "ISC"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ISC",
+        "http://directory.fsf.org/wiki/License:ISC"
+      ]
+    },
+    "lgpl-2.1": {
+      "name": "GNU Lesser General Public License v2.1",
+      "identifiers": {
+        "spdx": [
+          "LGPL-2.1"
+        ],
+        "FSF": [
+          "LGPLv2.1"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "same-license--library",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#LGPLv2.1",
+        "https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html"
+      ]
+    },
+    "lgpl-3.0": {
+      "name": "GNU Lesser General Public License v3.0",
+      "identifiers": {
+        "spdx": [
+          "LGPL-3.0"
+        ],
+        "FSF": [
+          "LGPLv3"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license--library",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#LGPLv3",
+        "https://www.gnu.org/licenses/lgpl.html"
+      ]
+    },
+    "lppl-1.3c": {
+      "name": "LaTeX Project Public License v1.3c",
+      "identifiers": {
+        "spdx": [
+          "LPPL-1.3c"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "private-use",
+        "warranty"
+      ]
+    },
+    "mit-0": {
+      "name": "MIT No Attribution",
+      "identifiers": {
+        "spdx": [
+          "MIT-0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "liability",
+        "modifications",
+        "private-use",
+        "warranty"
+      ]
+    },
+    "mit": {
+      "name": "MIT License",
+      "identifiers": {
+        "spdx": [
+          "MIT"
+        ],
+        "FSF": [
+          "Expat"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#Expat",
+        "http://directory.fsf.org/wiki/License:Expat"
+      ]
+    },
+    "mpl-2.0": {
+      "name": "Mozilla Public License 2.0",
+      "identifiers": {
+        "spdx": [
+          "MPL-2.0"
+        ],
+        "FSF": [
+          "MPL-2.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license--file",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#MPL-2.0",
+        "http://directory.fsf.org/wiki/License:MPLv2.0"
+      ]
+    },
+    "ms-pl": {
+      "name": "Microsoft Public License",
+      "identifiers": {
+        "spdx": [
+          "MS-PL"
+        ],
+        "FSF": [
+          "ms-pl"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ms-pl",
+        "http://directory.fsf.org/wiki/License:MsPL"
+      ]
+    },
+    "ms-rl": {
+      "name": "Microsoft Reciprocal License",
+      "identifiers": {
+        "spdx": [
+          "MS-RL"
+        ],
+        "FSF": [
+          "ms-rl"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "include-copyright",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license--file",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ms-rl",
+        "http://directory.fsf.org/wiki/License:MsRL"
+      ]
+    },
+    "mulanpsl-2.0": {
+      "name": "Mulan Permissive Software License, Version 2",
+      "identifiers": {
+        "spdx": [
+          "MulanPSL-2.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "trademark-use",
+        "warranty"
+      ]
+    },
+    "ncsa": {
+      "name": "University of Illinois/NCSA Open Source License",
+      "identifiers": {
+        "spdx": [
+          "NCSA"
+        ],
+        "FSF": [
+          "NCSA"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#NCSA",
+        "http://directory.fsf.org/wiki/License:IllinoisNCSA"
+      ]
+    },
+    "odbl-1.0": {
+      "name": "Open Data Commons Open Database License v1.0",
+      "identifiers": {
+        "spdx": [
+          "ODbL-1.0"
+        ],
+        "FSF": [
+          "ODbl"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ODbl",
+        "http://directory.fsf.org/wiki/License:ODbl"
+      ]
+    },
+    "ofl-1.1": {
+      "name": "SIL Open Font License 1.1",
+      "identifiers": {
+        "spdx": [
+          "OFL-1.1"
+        ],
+        "FSF": [
+          "SILOFL-1.1"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "same-license",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#SILOFL",
+        "http://directory.fsf.org/wiki/SIL_Open_Font_License_1.1"
+      ]
+    },
+    "osl-3.0": {
+      "name": "Open Software License 3.0",
+      "identifiers": {
+        "spdx": [
+          "OSL-3.0"
+        ],
+        "FSF": [
+          "OSL-3.0"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "network-use-disclose",
+        "patent-use",
+        "private-use",
+        "same-license",
+        "trademark-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#OSL",
+        "http://directory.fsf.org/wiki/License:OSLv3.0"
+      ]
+    },
+    "postgresql": {
+      "name": "PostgreSQL License",
+      "identifiers": {
+        "spdx": [
+          "PostgreSQL"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "modifications",
+        "private-use",
+        "warranty"
+      ]
+    },
+    "unlicense": {
+      "name": "The Unlicense",
+      "identifiers": {
+        "spdx": [
+          "Unlicense"
+        ],
+        "FSF": [
+          "Unlicense"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#Unlicense",
+        "http://directory.fsf.org/wiki/License:TheUnlicense"
+      ]
+    },
+    "upl-1.0": {
+      "name": "Universal Permissive License v1.0",
+      "identifiers": {
+        "spdx": [
+          "UPL-1.0"
+        ],
+        "FSF": [
+          "UPL"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "include-copyright",
+        "liability",
+        "libre",
+        "modifications",
+        "patent-use",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#UPL",
+        "http://directory.fsf.org/wiki/License:Universal_Permissive_License"
+      ]
+    },
+    "vim": {
+      "name": "Vim License",
+      "identifiers": {
+        "spdx": [
+          "Vim"
+        ],
+        "FSF": [
+          "Vim"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "disclose-source",
+        "distribution",
+        "document-changes",
+        "include-copyright",
+        "libre",
+        "modifications",
+        "private-use",
+        "same-license"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#Vim",
+        "http://directory.fsf.org/wiki/License:Vim7.2"
+      ]
+    },
+    "wtfpl": {
+      "name": "Do What The F*ck You Want To Public License",
+      "identifiers": {
+        "spdx": [
+          "WTFPL"
+        ],
+        "FSF": [
+          "WTFPL"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "libre",
+        "modifications",
+        "private-use"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#WTFPL",
+        "http://sam.zoy.org/wtfpl/COPYING"
+      ]
+    },
+    "zlib": {
+      "name": "zlib License",
+      "identifiers": {
+        "spdx": [
+          "Zlib"
+        ],
+        "FSF": [
+          "ZLib"
+        ]
+      },
+      "tags": [
+        "commercial-use",
+        "distribution",
+        "document-changes",
+        "include-copyright--source",
+        "liability",
+        "libre",
+        "modifications",
+        "private-use",
+        "warranty"
+      ],
+      "uris": [
+        "https://www.gnu.org/licenses/license-list.html#ZLib",
+        "http://directory.fsf.org/wiki/License:Zlib"
+      ]
+    }
+  }
+}
diff --git a/script/generate_fsf_api.rb b/script/generate_fsf_api.rb
new file mode 100755
index 000000000..3262c0747
--- /dev/null
+++ b/script/generate_fsf_api.rb
@@ -0,0 +1,57 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# Generates api/licenses.json in FSF License Metadata API compatible form.
+# Usage: script/generate_fsf_api.rb
+
+require 'json'
+require 'yaml'
+require 'open-uri'
+
+FSF_URL = 'https://wking.github.io/fsf-api/licenses-full.json'
+CONTEXT = 'https://wking.github.io/fsf-api/schema/licenses.jsonld'
+
+def fsf_by_spdx
+  object = JSON.parse(OpenURI.open_uri(FSF_URL).read)
+  map = {}
+  object['licenses'].each do |fsf_id, meta|
+    next unless meta.dig('identifiers', 'spdx')
+
+    meta['identifiers']['spdx'].each do |spdx|
+      map[spdx.downcase] ||= { 'fsf_id' => fsf_id, 'meta' => meta }
+    end
+  end
+  map
+end
+
+fsf_map = fsf_by_spdx
+licenses = {}
+
+Dir['_licenses/*.txt'].sort.each do |path|
+  slug = File.basename(path, '.txt')
+  parts = File.read(path).split(/^---$/, 3)
+  meta = YAML.safe_load(parts[1], permitted_classes: [Date, Time], aliases: true)
+  spdx_id = meta['spdx-id']
+  fsf = fsf_map[spdx_id.downcase]
+
+  tags = []
+  tags.concat(meta['permissions'] || [])
+  tags.concat(meta['conditions'] || [])
+  tags.concat(meta['limitations'] || [])
+  tags << 'libre' if fsf && fsf['meta']['tags']&.include?('libre')
+  tags.uniq!
+
+  entry = {
+    'name' => meta['title'],
+    'identifiers' => { 'spdx' => [spdx_id] },
+    'tags' => tags
+  }
+  if fsf
+    entry['identifiers']['FSF'] = [fsf['fsf_id']]
+    entry['uris'] = fsf['meta']['uris'] if fsf['meta']['uris']
+  end
+  licenses[slug] = entry
+end
+
+payload = { '@context' => CONTEXT, 'licenses' => licenses }
+File.write('api/licenses.json', JSON.pretty_generate(payload))
diff --git a/spec/fsf_api_spec.rb b/spec/fsf_api_spec.rb
new file mode 100644
index 000000000..ee081db6f
--- /dev/null
+++ b/spec/fsf_api_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'json'
+
+describe 'FSF API export' do
+  let(:api_path) { File.expand_path '../api/licenses.json', __dir__ }
+  let(:payload) { JSON.parse(File.read(api_path)) }
+
+  it 'uses the FSF API context' do
+    expect(payload['@context']).to eq('https://wking.github.io/fsf-api/schema/licenses.jsonld')
+  end
+
+  it 'includes every catalog license' do
+    expect(payload['licenses'].keys.sort).to eq(licenses.map { |l| l['spdx-lcase'] }.sort)
+  end
+
+  licenses.each do |license|
+    it "exports #{license['spdx-id']} with spdx identifiers and tags" do
+      entry = payload['licenses'][license['spdx-lcase']]
+      expect(entry['name']).to eq(license['title'])
+      expect(entry.dig('identifiers', 'spdx')).to include(license['spdx-id'])
+      expect(entry['tags']).to be_a(Array)
+      expect(entry['tags']).to include(*license['permissions'])
+    end
+  end
+end