First commit.

.gitignore

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+**/.env*
+**/node_modules/*

README.md

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+# steamcmd-app-update
+
+Outputs one `app_update <app-id> [-validate]` line per game in your Steam library.
+
+A useful tool if you intend to automate the fetching of your entire
+steam library :)
+
+# Usage
+
+Configuration
+```sh
+## .env
+
+# Steam API key.
+export STEAM_API_KEY=
+
+# The profile ID to fetch the list of owned games of.
+export STEAM_PROFILE_ID=
+
+# Comma separated list of games to skip
+export SKIP_GAMES='Dota 2 Test, Metro Exodus, 1240440'
+
+# Whether to force game file validation by adding -validate
+# Any value = true, unset/empty = false
+export FORCE_VALIDATE=
+```
+
+Execution
+
+```sh
+source .env && node ./index.js
+# Or integrate this into your library updating docker container!
+```

index.js

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+#! /usr/bin/env node
+
+const STEAM_API_KEY = process.env.STEAM_API_KEY;
+
+if (!STEAM_API_KEY) {
+  console.error(
+    "The STEAM_API_KEY environment variale should contain your Steam API key."
+  );
+  console.error("See: https://steamcommunity.com/dev/apikey");
+  process.exit(1);
+}
+
+const steam = new (require("steamapi"))(STEAM_API_KEY);
+
+const STEAM_PROFILE_ID = process.env.STEAM_PROFILE_ID;
+
+if (!STEAM_PROFILE_ID) {
+  console.error("The STEAM_PROFILE_ID environment variable is required.");
+  process.exit(1);
+}
+
+const skipGames = [];
+
+if (process.env.SKIP_GAMES) {
+  process.env.SKIP_GAMES.split(",")
+    .map((game) => game.trim())
+    .forEach((game) => {
+      skipGames.push(game);
+    });
+}
+
+function shouldSkip(gameId, gameTitle) {
+  return (
+    // We could be comparing strings against numbers here, that's fine
+    skipGames.find((game) => game == gameId || game == gameTitle) !== undefined
+  );
+}
+
+const shouldValidate = !!process.env.FORCE_VALIDATE;
+
+steam.getUserOwnedGames(STEAM_PROFILE_ID).then((games) =>
+  games
+    .filter((game) => !shouldSkip(game.appID, game.name))
+    .sort((a, b) => a.appID - b.appID)
+    .forEach((game) => {
+      console.log(
+        `// ${game.name} - https://store.steampowered.com/app/${game.appID}`
+      );
+      console.log(
+        `app_update ${game.appID}${shouldValidate ? " -validate" : ""}`
+      );
+    })
+);

package-lock.json

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+{
+  "name": "steamcmd-app-update",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "steamapi": "^2.1.2"
+      }
+    },
+    "node_modules/steamapi": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/steamapi/-/steamapi-2.2.0.tgz",
+      "integrity": "sha512-2UWklLzYQruuUC0a5AUgll1dU91/CWgiAhm/7y+rqc43kbBWereGTtmwo8wr6imjC64iV5893KChXghW0zK8Gg==",
+      "dependencies": {
+        "steamid": "^2.0.0"
+      }
+    },
+    "node_modules/steamid": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/steamid/-/steamid-2.0.0.tgz",
+      "integrity": "sha512-+BFJMbo+IxzyfovLR37E7APkaNfmrL3S+88T7wTMRHnQ6LBhzEawPnjfWNKM9eUL/dH45j+7vhSX4WaGXoa4/Q==",
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    }
+  },
+  "dependencies": {
+    "steamapi": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/steamapi/-/steamapi-2.2.0.tgz",
+      "integrity": "sha512-2UWklLzYQruuUC0a5AUgll1dU91/CWgiAhm/7y+rqc43kbBWereGTtmwo8wr6imjC64iV5893KChXghW0zK8Gg==",
+      "requires": {
+        "steamid": "^2.0.0"
+      }
+    },
+    "steamid": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/steamid/-/steamid-2.0.0.tgz",
+      "integrity": "sha512-+BFJMbo+IxzyfovLR37E7APkaNfmrL3S+88T7wTMRHnQ6LBhzEawPnjfWNKM9eUL/dH45j+7vhSX4WaGXoa4/Q=="
+    }
+  }
+}

package.json

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+{
+  "dependencies": {
+    "steamapi": "^2.1.2"
+  },
+  "name": "steamcmd-app-update",
+  "description": "Outputs one `app_update <app-id> [-validate]` line per game in your Steam library.",
+  "version": "1.0.0",
+  "main": "index.js",
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "steam",
+    "steamcmd",
+    "app_update"
+  ],
+  "author": "Matt Low <matt@mlow.ca>",
+  "license": "MIT"
+}