From 62981b22b57a847dbcf5cb37f9673e9d2b88ff76 Mon Sep 17 00:00:00 2001
From: Stephan Richter <s.richter@srsoftware.de>
Date: Wed, 18 Mar 2026 23:42:01 +0100
Subject: [PATCH] success using jspreadsheet

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>
---
 frontend/package-lock.json      | 711 +-------------------------------
 frontend/package.json           |   5 +-
 frontend/src/routes/calc.svelte |  31 +-
 3 files changed, 41 insertions(+), 706 deletions(-)

diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 05b90b1d..f2cfdc44 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -8,12 +8,11 @@
       "name": "frontend",
       "version": "0.0.0",
       "dependencies": {
-        "svelte-tiny-router": "^1.0.5",
-        "x-data-spreadsheet": "^1.1.9"
+        "jspreadsheet-ce": "^5.0.4",
+        "svelte-tiny-router": "^1.0.5"
       },
       "devDependencies": {
         "@sveltejs/vite-plugin-svelte": "^5.0.3",
-        "less": "^4.6.4",
         "svelte": "^5.28.1",
         "vite": "^6.3.5"
       }
@@ -490,6 +489,11 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@jspreadsheet/formula": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@jspreadsheet/formula/-/formula-2.0.2.tgz",
+      "integrity": "sha512-PDQYf9REQA53I7tVYkvkeyQxrd5jcjUeHgItYnRpjN2QiIQwawSqBDtGGEVQTSboTG+JwgGCuhvOpj7FxeKwew=="
+    },
     "node_modules/@rollup/rollup-android-arm-eabi": {
       "version": "4.44.1",
       "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.44.1.tgz",
@@ -823,33 +827,6 @@
         "node": ">=0.4.0"
       }
     },
-    "node_modules/ansi-escapes": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
-      "integrity": "sha512-wiXutNjDUlNEDWHcYH3jtZUhd3c4/VojassD8zHdHCY13xbZy2XbW+NKQwA0tWGBVzDA9qEzYwfoSsWmviidhw==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
-    "node_modules/ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha512-TIGnTpdo+E3+pCyAluZvtED5p5wCqLdezCyhPZzKPcxvFplEt4i+W7OONCKgeZFT3+y5NZZfOOS/Bdcanm1MYA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
-    "node_modules/ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha512-kmCevFghRiWM7HB5zTPULl4r9bVFSWjz62MhqizDGUrq2NWuNMQyuv4tHHoKJHs69M/MF64lEcHdYIocrdWQYA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/aria-query": {
       "version": "5.3.2",
       "license": "Apache-2.0",
@@ -864,73 +841,6 @@
         "node": ">= 0.4"
       }
     },
-    "node_modules/babel-polyfill": {
-      "version": "6.23.0",
-      "resolved": "https://registry.npmjs.org/babel-polyfill/-/babel-polyfill-6.23.0.tgz",
-      "integrity": "sha512-0l7mVU+LrQ2X/ZTUq63T5i3VyR2aTgcRTFmBcD6djQ/Fek6q1A9t5u0F4jZVYHzp78jwWAzGfLpAY1b4/I3lfg==",
-      "license": "MIT",
-      "dependencies": {
-        "babel-runtime": "^6.22.0",
-        "core-js": "^2.4.0",
-        "regenerator-runtime": "^0.10.0"
-      }
-    },
-    "node_modules/babel-runtime": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
-      "integrity": "sha512-ITKNuq2wKlW1fJg9sSW52eepoYgZBggvOAHC0u/CYu/qxQ9EVzThCgR69BnSXLHjy2f7SY5zaQ4yt7H9ZVxY2g==",
-      "license": "MIT",
-      "dependencies": {
-        "core-js": "^2.4.0",
-        "regenerator-runtime": "^0.11.0"
-      }
-    },
-    "node_modules/babel-runtime/node_modules/regenerator-runtime": {
-      "version": "0.11.1",
-      "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz",
-      "integrity": "sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg==",
-      "license": "MIT"
-    },
-    "node_modules/chalk": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-      "integrity": "sha512-U3lRVLMSlsCfjqYPbLyVv11M9CPW4I728d6TCKMAOJueEeB9/8o+eSsMnxPJD+Q+K909sdESg7C+tIkoH6on1A==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-styles": "^2.2.1",
-        "escape-string-regexp": "^1.0.2",
-        "has-ansi": "^2.0.0",
-        "strip-ansi": "^3.0.0",
-        "supports-color": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
-    "node_modules/chardet": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.4.2.tgz",
-      "integrity": "sha512-j/Toj7f1z98Hh2cYo2BVr85EpIRWqUi7rtRSGxh/cqUjqrnJe9l9UE7IUGd2vQ2p+kSHLkSzObQPZPLUC6TQwg==",
-      "license": "MIT"
-    },
-    "node_modules/cli-cursor": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
-      "integrity": "sha512-8lgKz8LmCRYZZQDpRyT2m5rKJ08TnU4tR9FFFW2rxpxR1FzWi4PQ/NfyODchAatHaUgnSPVcx/R5w6NuTBzFiw==",
-      "license": "MIT",
-      "dependencies": {
-        "restore-cursor": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/cli-width": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.1.tgz",
-      "integrity": "sha512-GRMWDxpOB6Dgk2E5Uo+3eEBvtOOlimMmpbFiKuLFnQzYDavtLFY3K5ona41jgN/WdRZtG7utuVSVTL4HbZHGkw==",
-      "license": "ISC"
-    },
     "node_modules/clsx": {
       "version": "2.1.1",
       "license": "MIT",
@@ -938,30 +848,6 @@
         "node": ">=6"
       }
     },
-    "node_modules/copy-anything": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/copy-anything/-/copy-anything-3.0.5.tgz",
-      "integrity": "sha512-yCEafptTtb4bk7GLEQoM8KVJpxAfdBJYaXyzQEgQQQgYrZiDp8SJmGKlYza6CYjEDNstAdNdKA3UuoULlEbS6w==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "is-what": "^4.1.8"
-      },
-      "engines": {
-        "node": ">=12.13"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/mesqueeb"
-      }
-    },
-    "node_modules/core-js": {
-      "version": "2.6.12",
-      "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.6.12.tgz",
-      "integrity": "sha512-Kb2wC0fvsWfQrgk8HU5lW6U/Lcs8+9aaYcy4ZFc6DDlo4nZ7n70dEgE5rtR0oG6ufKDUnrwfWL1mXR5ljDatrQ==",
-      "deprecated": "core-js@<3.23.3 is no longer maintained and not recommended for usage due to the number of issues. Because of the V8 engine whims, feature detection in old core-js versions could cause a slowdown up to 100x even if nothing is polyfilled. Some versions have web compatibility issues. Please, upgrade your dependencies to the actual version of core-js.",
-      "hasInstallScript": true,
-      "license": "MIT"
-    },
     "node_modules/debug": {
       "version": "4.4.1",
       "dev": true,
@@ -986,41 +872,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/encoding": {
-      "version": "0.1.13",
-      "resolved": "https://registry.npmjs.org/encoding/-/encoding-0.1.13.tgz",
-      "integrity": "sha512-ETBauow1T35Y/WZMkio9jiM0Z5xjHHmJ4XmjZOq1l/dXz3lr2sRn87nJy20RupqSh1F2m3HHPSp8ShIPQJrJ3A==",
-      "license": "MIT",
-      "dependencies": {
-        "iconv-lite": "^0.6.2"
-      }
-    },
-    "node_modules/encoding/node_modules/iconv-lite": {
-      "version": "0.6.3",
-      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
-      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
-      "license": "MIT",
-      "dependencies": {
-        "safer-buffer": ">= 2.1.2 < 3.0.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
-    "node_modules/errno": {
-      "version": "0.1.8",
-      "resolved": "https://registry.npmjs.org/errno/-/errno-0.1.8.tgz",
-      "integrity": "sha512-dJ6oBr5SQ1VSd9qkk7ByRgb/1SH4JZjCHSW/mr63/QcXO9zLVxvJ6Oy13nio03rxpSnVDDjFor75SjVeZWPW/A==",
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "dependencies": {
-        "prr": "~1.0.1"
-      },
-      "bin": {
-        "errno": "cli.js"
-      }
-    },
     "node_modules/esbuild": {
       "version": "0.25.5",
       "dev": true,
@@ -1060,15 +911,6 @@
         "@esbuild/win32-x64": "0.25.5"
       }
     },
-    "node_modules/escape-string-regexp": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.8.0"
-      }
-    },
     "node_modules/esm-env": {
       "version": "1.2.2",
       "license": "MIT"
@@ -1080,20 +922,6 @@
         "@jridgewell/sourcemap-codec": "^1.4.15"
       }
     },
-    "node_modules/external-editor": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/external-editor/-/external-editor-2.2.0.tgz",
-      "integrity": "sha512-bSn6gvGxKt+b7+6TKEv1ZycHleA7aHhRHyAqJyp5pbUFuYYNIzpZnQDk7AsYckyWdEnTeAnay0aCy2aV6iTk9A==",
-      "license": "MIT",
-      "dependencies": {
-        "chardet": "^0.4.0",
-        "iconv-lite": "^0.4.17",
-        "tmp": "^0.0.33"
-      },
-      "engines": {
-        "node": ">=0.12"
-      }
-    },
     "node_modules/fdir": {
       "version": "6.4.6",
       "dev": true,
@@ -1107,18 +935,6 @@
         }
       }
     },
-    "node_modules/figures": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/figures/-/figures-2.0.0.tgz",
-      "integrity": "sha512-Oa2M9atig69ZkfwiApY8F2Yy+tzMbazyvqv21R0NsSC8floSOC09BbT1ITWAdoMGQvJ/aZnR1KMwdx9tvHnTNA==",
-      "license": "MIT",
-      "dependencies": {
-        "escape-string-regexp": "^1.0.5"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/fsevents": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
@@ -1134,82 +950,6 @@
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
-    "node_modules/graceful-fs": {
-      "version": "4.2.11",
-      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.11.tgz",
-      "integrity": "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==",
-      "dev": true,
-      "license": "ISC",
-      "optional": true
-    },
-    "node_modules/has-ansi": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/has-ansi/-/has-ansi-2.0.0.tgz",
-      "integrity": "sha512-C8vBJ8DwUCx19vhm7urhTuUsr4/IyP6l4VzNQDv+ryHQObW3TTTp9yB68WpYgRe2bbaGuZ/se74IqFeVnMnLZg==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-regex": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
-    "node_modules/iconv-lite": {
-      "version": "0.4.24",
-      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
-      "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
-      "license": "MIT",
-      "dependencies": {
-        "safer-buffer": ">= 2.1.2 < 3"
-      },
-      "engines": {
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-    "node_modules/image-size": {
-      "version": "0.5.5",
-      "resolved": "https://registry.npmjs.org/image-size/-/image-size-0.5.5.tgz",
-      "integrity": "sha512-6TDAlDPZxUFCv+fuOkIoXT/V/f3Qbq8e37p+YOiYrUv3v9cc3/6x78VdfPgFVaB9dZYeLUfKgHRebpkm/oP2VQ==",
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "bin": {
-        "image-size": "bin/image-size.js"
-      },
-      "engines": {
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-    "node_modules/inquirer": {
-      "version": "3.0.6",
-      "resolved": "https://registry.npmjs.org/inquirer/-/inquirer-3.0.6.tgz",
-      "integrity": "sha512-thluxTGBXUGb8DuQcvH9/CM/CrcGyB5xUpWc9x6Slqcq1z/hRr2a6KxUpX4ddRfmbe0hg3E4jTvo5833aWz3BA==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-escapes": "^1.1.0",
-        "chalk": "^1.0.0",
-        "cli-cursor": "^2.1.0",
-        "cli-width": "^2.0.0",
-        "external-editor": "^2.0.1",
-        "figures": "^2.0.0",
-        "lodash": "^4.3.0",
-        "mute-stream": "0.0.7",
-        "run-async": "^2.2.0",
-        "rx": "^4.1.0",
-        "string-width": "^2.0.0",
-        "strip-ansi": "^3.0.0",
-        "through": "^2.3.6"
-      }
-    },
-    "node_modules/is-fullwidth-code-point": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-      "integrity": "sha512-VHskAKYM8RfSFXwee5t5cbN5PZeq1Wrh6qd5bkyiXIf6UQcN6w/A0eXM9r6t8d+GYOh+o6ZhiEnb88LN/Y8m2w==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/is-reference": {
       "version": "3.0.3",
       "license": "MIT",
@@ -1217,27 +957,19 @@
         "@types/estree": "^1.0.6"
       }
     },
-    "node_modules/is-stream": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
-      "integrity": "sha512-uQPm8kcs47jx38atAcWTVxyltQYoPT68y9aWYdV6yWXSyW8mzSat0TL6CiWdZeCdF3KrAvpVtnHbTv4RN+rqdQ==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.10.0"
+    "node_modules/jspreadsheet-ce": {
+      "version": "5.0.4",
+      "resolved": "https://registry.npmjs.org/jspreadsheet-ce/-/jspreadsheet-ce-5.0.4.tgz",
+      "integrity": "sha512-ra1JI1n+tEGgRMzTzNkPZjG0HZz8W6bFGAiTiHl+eYarXdRmS5qDc/ua3l2ev7oZ6Og9kjfrXYHVLUWiVc308w==",
+      "dependencies": {
+        "@jspreadsheet/formula": "^2.0.2",
+        "jsuites": "^5.12.0"
       }
     },
-    "node_modules/is-what": {
-      "version": "4.1.16",
-      "resolved": "https://registry.npmjs.org/is-what/-/is-what-4.1.16.tgz",
-      "integrity": "sha512-ZhMwEosbFJkA0YhFnNDgTM4ZxDRsS6HqTo7qsZM08fehyRYIYa0yHu5R6mgo1n/8MgaPBXiPimPD77baVFYg+A==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=12.13"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/mesqueeb"
-      }
+    "node_modules/jsuites": {
+      "version": "5.13.5",
+      "resolved": "https://registry.npmjs.org/jsuites/-/jsuites-5.13.5.tgz",
+      "integrity": "sha512-cvkcpy/v5I3+IAcNPE4UP38PFCEfUQw9JI5NN61dlcXLwkD+2UTIOsRPvgMLeqI1eDWHL4AHfrbcE/+TFciUsw=="
     },
     "node_modules/kleur": {
       "version": "4.1.5",
@@ -1247,42 +979,10 @@
         "node": ">=6"
       }
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-    "node_modules/less": {
-      "version": "4.6.4",
-      "resolved": "https://registry.npmjs.org/less/-/less-4.6.4.tgz",
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-      "dev": true,
-      "license": "Apache-2.0",
-      "dependencies": {
-        "copy-anything": "^3.0.5",
-        "parse-node-version": "^1.0.1"
-      },
-      "bin": {
-        "lessc": "bin/lessc"
-      },
-      "engines": {
-        "node": ">=18"
-      },
-      "optionalDependencies": {
-        "errno": "^0.1.1",
-        "graceful-fs": "^4.1.2",
-        "image-size": "~0.5.0",
-        "make-dir": "^2.1.0",
-        "mime": "^1.4.1",
-        "needle": "^3.1.0",
-        "source-map": "~0.6.0"
-      }
-    },
     "node_modules/locate-character": {
       "version": "3.0.0",
       "license": "MIT"
     },
-    "node_modules/lodash": {
-      "version": "4.17.23",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.23.tgz",
-      "integrity": "sha512-LgVTMpQtIopCi79SJeDiP0TfWi5CNEc/L/aRdTh3yIvmZXTnheWpKjSZhnvMl8iXbC1tFg9gdHHDMLoV7CnG+w==",
-      "license": "MIT"
-    },
     "node_modules/magic-string": {
       "version": "0.30.17",
       "license": "MIT",
@@ -1290,61 +990,11 @@
         "@jridgewell/sourcemap-codec": "^1.5.0"
       }
     },
-    "node_modules/make-dir": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
-      "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "dependencies": {
-        "pify": "^4.0.1",
-        "semver": "^5.6.0"
-      },
-      "engines": {
-        "node": ">=6"
-      }
-    },
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-        "inquirer": "3.0.6",
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-        "opencollective": "dist/bin/opencollective.js"
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-      "license": "MIT",
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@@ -1500,38 +1028,6 @@
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-      "resolved": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-2.0.1.tgz",
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-      "license": "MIT",
-      "dependencies": {
-        "pinkie": "^2.0.0"
-      },
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     "node_modules/postcss": {
       "version": "8.5.6",
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@@ -1559,33 +1055,6 @@
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       }
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@@ -1624,66 +1093,6 @@
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       }
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-      "dev": true,
-      "license": "ISC",
-      "optional": true,
-      "bin": {
-        "semver": "bin/semver"
-      }
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-      "license": "BSD-3-Clause",
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       "version": "1.2.1",
       "dev": true,
@@ -1692,61 +1101,6 @@
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-      "license": "MIT",
-      "dependencies": {
-        "is-fullwidth-code-point": "^2.0.0",
-        "strip-ansi": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/string-width/node_modules/ansi-regex": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.1.tgz",
-      "integrity": "sha512-+O9Jct8wf++lXxxFc4hc8LsjaSq0HFzzL7cVsw8pRDIPdjKD2mT4ytDZlLuSBZ4cLKZFXIrMGO7DbQCtMJJMKw==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=4"
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-    "node_modules/string-width/node_modules/strip-ansi": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
-      "integrity": "sha512-4XaJ2zQdCzROZDivEVIDPkcQn8LMFSa8kj8Gxb/Lnwzv9A8VctNZ+lfivC/sV3ivW8ElJTERXZoPBRrZKkNKow==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-regex": "^3.0.0"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/strip-ansi": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-      "integrity": "sha512-VhumSSbBqDTP8p2ZLKj40UjBCV4+v8bUSEpUb4KjRgWk9pbqGF4REFj6KEagidb2f/M6AzC0EmFyDNGaw9OCzg==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-regex": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
-    "node_modules/supports-color": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-      "integrity": "sha512-KKNVtd6pCYgPIKU4cp2733HWYCpplQhddZLBUryaAHou723x+FRzQ5Df824Fj+IyyuiQTRoub4SnIFfIcrp70g==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=0.8.0"
-      }
-    },
     "node_modules/svelte": {
       "version": "5.34.8",
       "license": "MIT",
@@ -1777,12 +1131,6 @@
         "svelte": ">=5.0.0"
       }
     },
-    "node_modules/through": {
-      "version": "2.3.8",
-      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
-      "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg==",
-      "license": "MIT"
-    },
     "node_modules/tinyglobby": {
       "version": "0.2.14",
       "dev": true,
@@ -1798,18 +1146,6 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
-    "node_modules/tmp": {
-      "version": "0.0.33",
-      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
-      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
-      "license": "MIT",
-      "dependencies": {
-        "os-tmpdir": "~1.0.2"
-      },
-      "engines": {
-        "node": ">=0.6.0"
-      }
-    },
     "node_modules/vite": {
       "version": "6.3.5",
       "dev": true,
@@ -1900,17 +1236,6 @@
         }
       }
     },
-    "node_modules/x-data-spreadsheet": {
-      "version": "1.1.9",
-      "resolved": "https://registry.npmjs.org/x-data-spreadsheet/-/x-data-spreadsheet-1.1.9.tgz",
-      "integrity": "sha512-wk7knDBYdHjtWiHUVQryZMy00dsGNCF+6wMb5ykwEFcAtBYkYZakJCOCHpEo8onC0Lb/q2gIynWpbQxA4qakyg==",
-      "hasInstallScript": true,
-      "license": "MIT",
-      "dependencies": {
-        "opencollective": "^1.0.3",
-        "opencollective-postinstall": "^2.0.2"
-      }
-    },
     "node_modules/zimmerframe": {
       "version": "1.1.2",
       "license": "MIT"
diff --git a/frontend/package.json b/frontend/package.json
index 5d4e9977..1e71a667 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -10,12 +10,11 @@
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^5.0.3",
-    "less": "^4.6.4",
     "svelte": "^5.28.1",
     "vite": "^6.3.5"
   },
   "dependencies": {
-    "svelte-tiny-router": "^1.0.5",
-    "x-data-spreadsheet": "^1.1.9"
+    "jspreadsheet-ce": "^5.0.4",
+    "svelte-tiny-router": "^1.0.5"
   }
 }
diff --git a/frontend/src/routes/calc.svelte b/frontend/src/routes/calc.svelte
index 01ed13ad..fb9df880 100644
--- a/frontend/src/routes/calc.svelte
+++ b/frontend/src/routes/calc.svelte
@@ -1,19 +1,30 @@
 <script>
 	import { onMount } from 'svelte';
-	import Spreadsheet from "x-data-spreadsheet";
-
+	import jspreadsheet from "jspreadsheet-ce";
+    import "jspreadsheet-ce/dist/jspreadsheet.css";
+    //import 'jsuites/dist/jsuites.min.css'; // required UI styles
 	function load(){
-const s = new Spreadsheet("#example-table")
-  .loadData({}) // load data
-  .change(data => {
-    // save data to db
-  });
 
-// data validation
-s.validate()
+jspreadsheet(document.getElementById('spreadsheet'), {
+    worksheets: [{
+            data: [
+                ["1","Sum of A:","=SUM(A1:A99)"],
+                ["2"],
+                ["3"],
+                ["4"]
+            ],
+            columns: [
+                { type: 'autonumber', title: 'amount' },
+                { type: 'text', width: '350px', title: 'description', align: 'right' },
+                { type: 'text', width: '250px', title: 'value' },
+            ],
+            // Name of the worksheet
+            worksheetName: 'Albums'
+    }]
+});
 	}
 
 	onMount(load);
 </script>
 
-<div id="example-table"></div>
+<div id="spreadsheet"></div>
\ No newline at end of file