Initial project setup for task-inventory

Node.js + Express 5 backend with flat NDJSON key-value store (borrowed from electronics-inventory). Sequential integer IDs per namespace. Vanilla JS SPA with filters for status, priority, and tags. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-05-17 18:05:30 +00:00
commit 1100720b03
13 changed files with 1773 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,3 @@
+node_modules/
+data/
+*.tmp
--- a/lib/ids.mjs
+++ b/lib/ids.mjs
@@ -0,0 +1,18 @@
+import { Simple_KeyValue_Store } from './kv-store.mjs';
+import { mkdirSync } from 'node:fs';
+
+mkdirSync('./data', { recursive: true });
+
+const id_store = new Simple_KeyValue_Store('./data/ids.ndjson', {
+	auto_load: true,
+	auto_store: true,
+	debounce_flush_timeout: 1000,
+});
+
+export function next_id(namespace) {
+	const key = `seq:${namespace}`;
+	const current = id_store.get(key) ?? 0;
+	const next = current + 1;
+	id_store.set(key, next);
+	return next;
+}
--- a/lib/kv-store.mjs
+++ b/lib/kv-store.mjs
@@ -0,0 +1,203 @@
+import fs from 'node:fs';
+
+function DEFAULT_SERIALIZER_FACTORY() {
+	const s = new Serializer();
+
+	//TODO - buffers and possibly typed arrays
+	s.register_constructor(BigInt, 'Bi', (raw) => raw.toString(), (stored) => BigInt(stored));
+	s.register_constructor(Buffer, 'Bu', (raw) => raw.toString('base64'), (stored) => Buffer.from(stored, 'base64'));
+	s.register_default('P', (raw) => (JSON.stringify(raw), raw), (stored) => stored);
+
+	return s;
+}
+
+class Serializer {
+	constructor(constructor_lut=new Map(), identity_lut=new Map(), type_lut=new Map()) {
+		Object.assign(this, { constructor_lut, identity_lut, type_lut, default: null });
+	}
+
+	serialize(value) {
+		const { constructor_lut, identity_lut } = this;
+
+		const by_identity = identity_lut.get(value);
+		if (by_identity) {
+			const { type_id, serialize_value } = by_identity;
+			return [ type_id, serialize_value(value) ];
+		}
+
+		const by_constructor = constructor_lut.get(value.constructor);
+		if (by_constructor) {
+			const { type_id, serialize_value } = by_constructor;
+			return [ type_id, serialize_value(value) ];
+		}
+
+		return [this.default.type_id, this.default.serialize_value(value)];
+	}
+
+	deserialize(value) {
+		if (value === undefined) {
+			throw new Error(`Deserialize called without value`);
+		}
+		const [ type_id, raw_value ] = value;
+		const { type_lut } = this;
+
+		const operation = type_lut.get(type_id);
+		if (!operation) {
+			throw new Error(`Unknown type_id: ${type_id}`);
+		}
+		const { deserialize_value } = operation;
+		return deserialize_value(raw_value);
+	}
+
+	register_default(type_id, serialize_value, deserialize_value) {
+		const { type_lut } = this;
+		const operation = { selector: 'default', type_id, serialize_value, deserialize_value };
+		type_lut.set(type_id, operation);
+		this.default = operation;
+	}
+
+	register_constructor(constructor, type_id, serialize_value, deserialize_value) {
+		const { constructor_lut, type_lut } = this;
+		const operation = { selector: 'constructor', constructor, type_id, serialize_value, deserialize_value };
+		constructor_lut.set(constructor, operation);
+		type_lut.set(type_id, operation);
+	}
+
+	register_identity(identity, type_id, serialize_value, deserialize_value) {
+		const { identity_lut, type_lut } = this;
+		const operation = { selector: 'identity', identity, type_id, serialize_value, deserialize_value };
+		identity_lut.set(identity, operation);
+		type_lut.set(type_id, operation);
+	}
+}
+
+
+
+const DEFAULT_SETTINGS = {
+	auto_load: false,
+	auto_store: false,
+	auto_store_events: [
+		'SIGINT',
+		'SIGTERM',
+		'exit',
+	],
+	debounce_flush_timeout: null,
+}
+
+
+export class Simple_KeyValue_Store {
+	#flush_debounce_timer = null
+
+	constructor(storage_path, settings=DEFAULT_SETTINGS, data=new Map(), serializer=DEFAULT_SERIALIZER_FACTORY()) {
+
+		const actual_settings = { ...DEFAULT_SETTINGS, ...settings };
+		Object.assign(this, { storage_path, data, serializer, ...actual_settings });
+
+		if (this.auto_load) {
+			this.load();
+		}
+
+		if (this.auto_store) {
+			for (const event of this.auto_store_events) {
+				process.on(event, () => (this.store(), process.exit()) );
+			}
+		}
+
+	}
+
+	trigger_flush_debouncer() {
+		if (this.#flush_debounce_timer) {
+			clearTimeout(this.#flush_debounce_timer);
+			this.#flush_debounce_timer = null;
+		}
+
+		const { debounce_flush_timeout } = this;
+		if (debounce_flush_timeout) {
+			this.#flush_debounce_timer = setTimeout(() => {
+				this.#flush_debounce_timer = null;
+				this.store();
+			}, debounce_flush_timeout);
+		}
+	}
+
+
+	create_pending_filename() {
+		const suffix = process.hrtime.bigint().toString(16);
+		const { storage_path } = this;
+		return `${storage_path}-${suffix}.tmp`;
+	}
+
+	get(key) {
+		const { serializer } = this;
+		const raw_entry = this.data.get(key);
+		if (raw_entry !== undefined) {
+			return serializer.deserialize(raw_entry);
+		}
+	}
+
+	set(key, value) {
+		const { serializer } = this;
+		this.data.set(key, serializer.serialize(value));
+		this.trigger_flush_debouncer();
+	}
+
+	delete(key) {
+		const result = this.data.delete(key);
+		if (result) {
+			this.trigger_flush_debouncer();
+		}
+		return result;
+	}
+
+	load() {
+		const { data, storage_path } = this;
+		let file_contents;
+		try {
+			file_contents = fs.readFileSync(storage_path, 'utf-8');
+		} catch (e) {
+			if (e.code === 'ENOENT') { return; }
+			throw e;
+		}
+
+		for (const line of file_contents.split('\n')) {
+			if (!line) continue;
+			const [key, value] = JSON.parse(line);
+			data.set(key, value);
+		}
+
+	}
+
+	store() {
+		if (this.#flush_debounce_timer) {
+			clearTimeout(this.#flush_debounce_timer);
+			this.#flush_debounce_timer = null;
+		}
+		const { data, storage_path } = this;
+		const pending_out_path = this.create_pending_filename();
+		const out_fd = fs.openSync(pending_out_path, 'w');
+		try {
+			for (const [key, value] of data.entries()) {
+				fs.writeSync(out_fd, JSON.stringify([key, value]) + '\n');
+			}
+			fs.closeSync(out_fd);
+			fs.renameSync(pending_out_path, storage_path);
+		} finally {
+			try { fs.closeSync(out_fd); } catch {}
+			try { fs.unlinkSync(pending_out_path); } catch {}
+		}
+	}
+
+}
+
+
+/*
+const kvs = new Simple_KeyValue_Store('./data.ndjson', { auto_load: true, auto_store: true, debounce_flush_timeout: 10_000 });
+
+console.log(kvs.get('hello'), kvs.get('shello'), kvs.get('Path'));
+kvs.set('hello', 123456789n)
+
+console.log(Buffer.from([123, 10, 20]));
+kvs.set('Path', Buffer.from([123, 10, 20]));
+
+process.exit()	//Exit immediately instead of waiting for debounce_timer (this also prevents double store - we should document this properly)
+*/
--- a/lib/storage.mjs
+++ b/lib/storage.mjs
@@ -0,0 +1,34 @@
+import { mkdirSync } from 'node:fs';
+import { Simple_KeyValue_Store } from './kv-store.mjs';
+
+mkdirSync('./data', { recursive: true });
+
+const store = new Simple_KeyValue_Store('./data/tasks.ndjson', {
+	auto_load: true,
+	auto_store: true,
+	debounce_flush_timeout: 5000,
+});
+
+// --- Tasks ---
+
+export function list_tasks() {
+	const result = [];
+	for (const [key] of store.data.entries()) {
+		if (key.startsWith('task:')) {
+			result.push(store.get(key));
+		}
+	}
+	return result.sort((a, b) => b.created_at - a.created_at);
+}
+
+export function get_task(id) {
+	return store.get(`task:${id}`) ?? null;
+}
+
+export function set_task(task) {
+	store.set(`task:${task.id}`, task);
+}
+
+export function delete_task(id) {
+	return store.delete(`task:${id}`);
+}
--- a/package-lock.json
+++ b/package-lock.json
@@ -0,0 +1,846 @@
+{
+	"name": "task-inventory",
+	"version": "0.1.0",
+	"lockfileVersion": 3,
+	"requires": true,
+	"packages": {
+		"": {
+			"name": "task-inventory",
+			"version": "0.1.0",
+			"dependencies": {
+				"express": "^5.2.1"
+			},
+			"engines": {
+				"node": ">=25"
+			}
+		},
+		"node_modules/accepts": {
+			"version": "2.0.0",
+			"resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
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+			"license": "MIT",
+			"dependencies": {
+				"mime-types": "^3.0.0",
+				"negotiator": "^1.0.0"
+			},
+			"engines": {
+				"node": ">= 0.6"
+			}
+		},
+		"node_modules/body-parser": {
+			"version": "2.2.2",
+			"resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.2.2.tgz",
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+			"license": "MIT",
+			"dependencies": {
+				"bytes": "^3.1.2",
+				"content-type": "^1.0.5",
+				"debug": "^4.4.3",
+				"http-errors": "^2.0.0",
+				"iconv-lite": "^0.7.0",
+				"on-finished": "^2.4.1",
+				"qs": "^6.14.1",
+				"raw-body": "^3.0.1",
+				"type-is": "^2.0.1"
+			},
+			"engines": {
+				"node": ">=18"
+			},
+			"funding": {
+				"type": "opencollective",
+				"url": "https://opencollective.com/express"
+			}
+		},
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+			"license": "MIT",
+			"engines": {
+				"node": ">= 0.8"
+			}
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+				"node": ">= 0.4"
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+			"license": "MIT",
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+				"type": "opencollective",
+				"url": "https://opencollective.com/express"
+			}
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+			"engines": {
+				"node": ">= 0.6"
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+			"dependencies": {
+				"accepts": "^2.0.0",
+				"body-parser": "^2.2.1",
+				"content-disposition": "^1.0.0",
+				"content-type": "^1.0.5",
+				"cookie": "^0.7.1",
+				"cookie-signature": "^1.2.1",
+				"debug": "^4.4.0",
+				"depd": "^2.0.0",
+				"encodeurl": "^2.0.0",
+				"escape-html": "^1.0.3",
+				"etag": "^1.8.1",
+				"finalhandler": "^2.1.0",
+				"fresh": "^2.0.0",
+				"http-errors": "^2.0.0",
+				"merge-descriptors": "^2.0.0",
+				"mime-types": "^3.0.0",
+				"on-finished": "^2.4.1",
+				"once": "^1.4.0",
+				"parseurl": "^1.3.3",
+				"proxy-addr": "^2.0.7",
+				"qs": "^6.14.0",
+				"range-parser": "^1.2.1",
+				"router": "^2.2.0",
+				"send": "^1.1.0",
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+			"license": "ISC"
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+			},
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+			"dependencies": {
+				"call-bound": "^1.0.2",
+				"es-errors": "^1.3.0",
+				"get-intrinsic": "^1.2.5",
+				"object-inspect": "^1.13.3"
+			},
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+				"node": ">= 0.4"
+			},
+			"funding": {
+				"url": "https://github.com/sponsors/ljharb"
+			}
+		},
+		"node_modules/side-channel-weakmap": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/side-channel-weakmap/-/side-channel-weakmap-1.0.2.tgz",
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+			"license": "MIT",
+			"dependencies": {
+				"call-bound": "^1.0.2",
+				"es-errors": "^1.3.0",
+				"get-intrinsic": "^1.2.5",
+				"object-inspect": "^1.13.3",
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+			},
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+			},
+			"funding": {
+				"url": "https://github.com/sponsors/ljharb"
+			}
+		},
+		"node_modules/statuses": {
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+			"license": "MIT",
+			"engines": {
+				"node": ">= 0.8"
+			}
+		},
+		"node_modules/toidentifier": {
+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+			"integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+			"license": "MIT",
+			"engines": {
+				"node": ">=0.6"
+			}
+		},
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+			"license": "MIT",
+			"dependencies": {
+				"content-type": "^2.0.0",
+				"media-typer": "^1.1.0",
+				"mime-types": "^3.0.0"
+			},
+			"engines": {
+				"node": ">= 18"
+			},
+			"funding": {
+				"type": "opencollective",
+				"url": "https://opencollective.com/express"
+			}
+		},
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+			"version": "2.0.0",
+			"resolved": "https://registry.npmjs.org/content-type/-/content-type-2.0.0.tgz",
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+			"license": "MIT",
+			"engines": {
+				"node": ">=18"
+			},
+			"funding": {
+				"type": "opencollective",
+				"url": "https://opencollective.com/express"
+			}
+		},
+		"node_modules/unpipe": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+			"integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+			"license": "MIT",
+			"engines": {
+				"node": ">= 0.8"
+			}
+		},
+		"node_modules/vary": {
+			"version": "1.1.2",
+			"resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+			"integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+			"license": "MIT",
+			"engines": {
+				"node": ">= 0.8"
+			}
+		},
+		"node_modules/wrappy": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+			"integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+			"license": "ISC"
+		}
+	}
+}
--- a/package.json
+++ b/package.json
@@ -0,0 +1,14 @@
+{
+	"name": "task-inventory",
+	"version": "0.1.0",
+	"type": "module",
+	"engines": {
+		"node": ">=25"
+	},
+	"scripts": {
+		"start": "node server.mjs"
+	},
+	"dependencies": {
+		"express": "^5.2.1"
+	}
+}
--- a/public/app.mjs
+++ b/public/app.mjs
@@ -0,0 +1,267 @@
+import * as api from './lib/api.mjs';
+import { qs, clone, set_text, show, hide } from './lib/dom.mjs';
+
+// ---------------------------------------------------------------------------
+// State
+// ---------------------------------------------------------------------------
+
+class App_State {
+	constructor() {
+		this.tasks = [];
+		this.filter_status = 'open';
+		this.filter_priority = '';
+		this.filter_tag = '';
+		this.search = '';
+	}
+}
+
+const state = new App_State();
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+function filtered_tasks() {
+	return state.tasks.filter(t => {
+		if (state.filter_status && t.status !== state.filter_status) { return false; }
+		if (state.filter_priority && t.priority !== state.filter_priority) { return false; }
+		if (state.filter_tag && !t.tags.includes(state.filter_tag)) { return false; }
+		if (state.search) {
+			const q = state.search.toLowerCase();
+			if (!t.title.toLowerCase().includes(q) && !t.body.toLowerCase().includes(q)) { return false; }
+		}
+		return true;
+	});
+}
+
+function all_tags() {
+	const tags = new Set();
+	for (const t of state.tasks) {
+		for (const tag of t.tags) { tags.add(tag); }
+	}
+	return [...tags].sort();
+}
+
+// ---------------------------------------------------------------------------
+// Task dialog
+// ---------------------------------------------------------------------------
+
+class Task_Dialog {
+	constructor() {
+		const el = clone('t-task-dialog');
+		document.body.appendChild(el);
+		this.dialog = el;
+		this.form = el.querySelector('form');
+		this.on_save = null;
+
+		el.querySelector('.btn-cancel').addEventListener('click', () => el.close());
+		this.form.addEventListener('submit', (e) => {
+			e.preventDefault();
+			if (this.on_save) { this.on_save(this._read_form()); }
+			el.close();
+		});
+	}
+
+	_read_form() {
+		const fd = new FormData(this.form);
+		const tags_raw = fd.get('tags').trim();
+		return {
+			title: fd.get('title').trim(),
+			body: fd.get('body').trim(),
+			status: fd.get('status'),
+			priority: fd.get('priority'),
+			tags: tags_raw ? tags_raw.split(',').map(s => s.trim()).filter(Boolean) : [],
+		};
+	}
+
+	open(title_text, initial = {}, on_save) {
+		set_text(this.dialog, '.dialog-title', title_text);
+		this.form.elements['title'].value    = initial.title    ?? '';
+		this.form.elements['body'].value     = initial.body     ?? '';
+		this.form.elements['status'].value   = initial.status   ?? 'open';
+		this.form.elements['priority'].value = initial.priority ?? 'normal';
+		this.form.elements['tags'].value     = (initial.tags ?? []).join(', ');
+		this.on_save = on_save;
+		this.dialog.showModal();
+	}
+}
+
+const task_dialog = new Task_Dialog();
+
+// ---------------------------------------------------------------------------
+// Render
+// ---------------------------------------------------------------------------
+
+function render_tasks(container) {
+	container.innerHTML = '';
+
+	// Toolbar
+	const toolbar = document.createElement('div');
+	toolbar.className = 'toolbar';
+	toolbar.innerHTML = '<h2>Tasks</h2>';
+	const add_btn = document.createElement('button');
+	add_btn.className = 'btn-primary';
+	add_btn.textContent = '+ New task';
+	add_btn.addEventListener('click', () => open_add_dialog());
+	toolbar.appendChild(add_btn);
+	container.appendChild(toolbar);
+
+	// Filter bar
+	const filter_bar = document.createElement('div');
+	filter_bar.className = 'filter-bar';
+
+	const status_sel = document.createElement('select');
+	for (const [val, label] of [['', 'All statuses'], ['open', 'Open'], ['deferred', 'Deferred'], ['done', 'Done'], ['cancelled', 'Cancelled']]) {
+		const opt = document.createElement('option');
+		opt.value = val; opt.textContent = label;
+		if (val === state.filter_status) { opt.selected = true; }
+		status_sel.appendChild(opt);
+	}
+	status_sel.addEventListener('change', () => { state.filter_status = status_sel.value; render(); });
+	filter_bar.appendChild(status_sel);
+
+	const priority_sel = document.createElement('select');
+	for (const [val, label] of [['', 'All priorities'], ['high', 'High'], ['normal', 'Normal'], ['low', 'Low']]) {
+		const opt = document.createElement('option');
+		opt.value = val; opt.textContent = label;
+		if (val === state.filter_priority) { opt.selected = true; }
+		priority_sel.appendChild(opt);
+	}
+	priority_sel.addEventListener('change', () => { state.filter_priority = priority_sel.value; render(); });
+	filter_bar.appendChild(priority_sel);
+
+	const tag_sel = document.createElement('select');
+	const all_opt = document.createElement('option');
+	all_opt.value = ''; all_opt.textContent = 'All tags';
+	tag_sel.appendChild(all_opt);
+	for (const tag of all_tags()) {
+		const opt = document.createElement('option');
+		opt.value = tag; opt.textContent = tag;
+		if (tag === state.filter_tag) { opt.selected = true; }
+		tag_sel.appendChild(opt);
+	}
+	tag_sel.addEventListener('change', () => { state.filter_tag = tag_sel.value; render(); });
+	filter_bar.appendChild(tag_sel);
+
+	const search_input = document.createElement('input');
+	search_input.type = 'text';
+	search_input.placeholder = 'Search…';
+	search_input.value = state.search;
+	search_input.addEventListener('input', () => { state.search = search_input.value; render(); });
+	filter_bar.appendChild(search_input);
+
+	container.appendChild(filter_bar);
+
+	// Task list
+	const tasks = filtered_tasks();
+	const list = document.createElement('div');
+	list.className = 'task-list';
+
+	if (tasks.length === 0) {
+		const empty = document.createElement('div');
+		empty.className = 'empty-state';
+		empty.textContent = 'No tasks.';
+		list.appendChild(empty);
+	}
+
+	for (const task of tasks) {
+		const row = clone('t-task-row');
+		row.dataset.priority = task.priority;
+		row.dataset.status   = task.status;
+
+		set_text(row, '.task-id', `#${task.id}`);
+
+		const status_el = row.querySelector('.task-status');
+		status_el.textContent = task.status;
+		status_el.dataset.val = task.status;
+
+		const priority_el = row.querySelector('.task-priority');
+		priority_el.textContent = task.priority;
+		priority_el.dataset.val = task.priority;
+
+		set_text(row, '.task-title', task.title);
+
+		const tags_el = row.querySelector('.task-tags');
+		for (const tag of task.tags) {
+			const span = document.createElement('span');
+			span.className = 'tag';
+			span.textContent = tag;
+			tags_el.appendChild(span);
+		}
+
+		row.querySelector('.btn-edit').addEventListener('click', () => open_edit_dialog(task));
+		row.querySelector('.btn-delete').addEventListener('click', () => confirm_delete(task));
+
+		list.appendChild(row);
+	}
+
+	container.appendChild(list);
+}
+
+function render() {
+	const main = document.getElementById('main');
+	render_tasks(main);
+}
+
+// ---------------------------------------------------------------------------
+// Actions
+// ---------------------------------------------------------------------------
+
+function open_add_dialog() {
+	task_dialog.open('New task', {}, async (data) => {
+		try {
+			const { task } = await api.create_task(data);
+			state.tasks.unshift(task);
+			render();
+		} catch (err) {
+			alert(err.message);
+		}
+	});
+}
+
+function open_edit_dialog(task) {
+	task_dialog.open('Edit task', task, async (data) => {
+		try {
+			const { task: updated } = await api.update_task(task.id, data);
+			const idx = state.tasks.findIndex(t => t.id === task.id);
+			if (idx !== -1) { state.tasks[idx] = updated; }
+			render();
+		} catch (err) {
+			alert(err.message);
+		}
+	});
+}
+
+function confirm_delete(task) {
+	if (!confirm(`Delete task #${task.id}: "${task.title}"?`)) { return; }
+	api.delete_task(task.id).then(() => {
+		state.tasks = state.tasks.filter(t => t.id !== task.id);
+		render();
+	}).catch(err => alert(err.message));
+}
+
+// ---------------------------------------------------------------------------
+// Init
+// ---------------------------------------------------------------------------
+
+async function init() {
+	// Inject templates
+	const tmpl_res = await fetch('/templates.html');
+	const tmpl_html = await tmpl_res.text();
+	const tmpl_container = document.createElement('div');
+	tmpl_container.innerHTML = tmpl_html;
+	for (const tmpl of tmpl_container.querySelectorAll('template')) {
+		document.body.appendChild(tmpl);
+	}
+
+	// Load data
+	const { tasks } = await api.get_tasks();
+	state.tasks = tasks;
+
+	render();
+}
+
+init().catch(err => {
+	console.error('Init failed:', err);
+	document.getElementById('main').textContent = 'Failed to load: ' + err.message;
+});
--- a/public/index.html
+++ b/public/index.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+	<meta charset="UTF-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
+	<title>Task Inventory</title>
+	<link rel="stylesheet" href="/style.css">
+</head>
+<body>
+	<header>
+		<h1>Task Inventory</h1>
+		<nav>
+			<button data-nav="tasks" class="nav-btn active">Tasks</button>
+		</nav>
+	</header>
+	<main id="main"></main>
+	<script type="module" src="/app.mjs"></script>
+</body>
+</html>
--- a/public/lib/api.mjs
+++ b/public/lib/api.mjs
@@ -0,0 +1,16 @@
+async function req(method, path, body) {
+	const opts = { method, headers: {} };
+	if (body !== undefined) {
+		opts.headers['Content-Type'] = 'application/json';
+		opts.body = JSON.stringify(body);
+	}
+	const res = await fetch(path, opts);
+	const data = await res.json();
+	if (!data.ok) { throw new Error(data.error ?? 'Request failed'); }
+	return data;
+}
+
+export const get_tasks    = ()          => req('GET',    '/api/tasks');
+export const create_task  = (body)      => req('POST',   '/api/tasks', body);
+export const update_task  = (id, body)  => req('PUT',    `/api/tasks/${id}`, body);
+export const delete_task  = (id)        => req('DELETE', `/api/tasks/${id}`);
--- a/public/lib/dom.mjs
+++ b/public/lib/dom.mjs
@@ -0,0 +1,16 @@
+export function qs(scope, selector) {
+	if (typeof scope === 'string') { return document.querySelector(scope); }
+	return scope.querySelector(selector);
+}
+
+export function clone(template_id) {
+	return document.getElementById(template_id).content.cloneNode(true).firstElementChild;
+}
+
+export function set_text(el, selector, text) {
+	const target = typeof selector === 'string' ? el.querySelector(selector) : selector;
+	target.textContent = text;
+}
+
+export function show(el) { el.hidden = false; }
+export function hide(el) { el.hidden = true; }
--- a/public/style.css
+++ b/public/style.css
@@ -0,0 +1,204 @@
+*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
+
+body {
+	font-family: system-ui, sans-serif;
+	font-size: 14px;
+	background: #1a1a1a;
+	color: #e0e0e0;
+	min-height: 100vh;
+}
+
+header {
+	display: flex;
+	align-items: center;
+	gap: 1.5rem;
+	padding: 0.75rem 1.25rem;
+	background: #242424;
+	border-bottom: 1px solid #333;
+}
+
+header h1 {
+	font-size: 1rem;
+	font-weight: 600;
+	color: #fff;
+}
+
+nav { display: flex; gap: 0.5rem; }
+
+.nav-btn {
+	padding: 0.3rem 0.75rem;
+	border: 1px solid #444;
+	border-radius: 4px;
+	background: transparent;
+	color: #aaa;
+	cursor: pointer;
+	font-size: 13px;
+}
+
+.nav-btn.active, .nav-btn:hover {
+	background: #333;
+	color: #fff;
+	border-color: #555;
+}
+
+main { padding: 1.25rem; }
+
+/* Toolbar */
+.toolbar {
+	display: flex;
+	align-items: center;
+	gap: 0.75rem;
+	margin-bottom: 1rem;
+}
+
+.toolbar h2 { font-size: 1rem; flex: 1; }
+
+/* Filter bar */
+.filter-bar {
+	display: flex;
+	gap: 0.5rem;
+	margin-bottom: 0.75rem;
+	flex-wrap: wrap;
+}
+
+.filter-bar select, .filter-bar input {
+	padding: 0.3rem 0.5rem;
+	background: #2a2a2a;
+	border: 1px solid #444;
+	border-radius: 4px;
+	color: #e0e0e0;
+	font-size: 13px;
+}
+
+/* Task list */
+.task-list { display: flex; flex-direction: column; gap: 1px; }
+
+.task-row {
+	display: grid;
+	grid-template-columns: 2.5rem 5rem 4.5rem 1fr auto auto;
+	align-items: center;
+	gap: 0.5rem;
+	padding: 0.5rem 0.75rem;
+	background: #242424;
+	border-radius: 4px;
+	border-left: 3px solid transparent;
+}
+
+.task-row[data-priority='high']   { border-left-color: #e05555; }
+.task-row[data-priority='normal'] { border-left-color: #5588e0; }
+.task-row[data-priority='low']    { border-left-color: #555; }
+
+.task-row[data-status='done']      { opacity: 0.5; }
+.task-row[data-status='cancelled'] { opacity: 0.4; text-decoration: line-through; }
+
+.task-id    { color: #666; font-size: 12px; }
+.task-title { font-weight: 500; }
+
+.task-status, .task-priority {
+	font-size: 11px;
+	padding: 0.15rem 0.4rem;
+	border-radius: 3px;
+	text-align: center;
+	text-transform: uppercase;
+	letter-spacing: 0.03em;
+}
+
+.task-status[data-val='open']      { background: #1e3a5f; color: #6ab0f5; }
+.task-status[data-val='done']      { background: #1a3a1a; color: #6ad06a; }
+.task-status[data-val='cancelled'] { background: #2a1a1a; color: #c06060; }
+.task-status[data-val='deferred']  { background: #2a2a1a; color: #c0b060; }
+
+.task-priority[data-val='high']   { background: #3a1a1a; color: #e08080; }
+.task-priority[data-val='normal'] { background: transparent; color: #777; }
+.task-priority[data-val='low']    { background: transparent; color: #555; }
+
+.task-tags { display: flex; gap: 0.25rem; flex-wrap: wrap; }
+
+.tag {
+	font-size: 11px;
+	padding: 0.1rem 0.35rem;
+	background: #2a2a3a;
+	border-radius: 3px;
+	color: #8899cc;
+}
+
+.task-actions { display: flex; gap: 0.4rem; }
+
+/* Buttons */
+button {
+	cursor: pointer;
+	border: none;
+	border-radius: 4px;
+	font-size: 13px;
+	padding: 0.3rem 0.7rem;
+	background: #333;
+	color: #ccc;
+}
+
+button:hover { background: #444; color: #fff; }
+
+.btn-primary {
+	background: #2a4a7a;
+	color: #8bb8f0;
+}
+
+.btn-primary:hover { background: #335a90; color: #c0d8ff; }
+
+.btn-danger { background: #4a1a1a; color: #e08080; }
+.btn-danger:hover { background: #5a2020; color: #ffaaaa; }
+
+.btn-edit  { font-size: 12px; padding: 0.2rem 0.5rem; }
+.btn-delete { font-size: 12px; padding: 0.2rem 0.5rem; }
+
+/* Dialog */
+dialog {
+	background: #242424;
+	border: 1px solid #444;
+	border-radius: 8px;
+	color: #e0e0e0;
+	padding: 1.5rem;
+	width: 480px;
+	max-width: 95vw;
+}
+
+dialog::backdrop { background: rgba(0,0,0,0.6); }
+
+dialog h2 { margin-bottom: 1rem; font-size: 1rem; }
+
+dialog label {
+	display: flex;
+	flex-direction: column;
+	gap: 0.3rem;
+	margin-bottom: 0.75rem;
+	font-size: 12px;
+	color: #999;
+}
+
+dialog input, dialog textarea, dialog select {
+	padding: 0.4rem 0.6rem;
+	background: #1a1a1a;
+	border: 1px solid #444;
+	border-radius: 4px;
+	color: #e0e0e0;
+	font-size: 13px;
+	font-family: inherit;
+	resize: vertical;
+}
+
+dialog input:focus, dialog textarea:focus, dialog select:focus {
+	outline: none;
+	border-color: #5588e0;
+}
+
+.dialog-buttons {
+	display: flex;
+	gap: 0.5rem;
+	justify-content: flex-end;
+	margin-top: 1rem;
+}
+
+.empty-state {
+	color: #555;
+	padding: 2rem;
+	text-align: center;
+}
--- a/public/templates.html
+++ b/public/templates.html
@@ -0,0 +1,51 @@
+<!-- Task list item -->
+<template id="t-task-row">
+	<div class="task-row">
+		<span class="task-id"></span>
+		<span class="task-status"></span>
+		<span class="task-priority"></span>
+		<span class="task-title"></span>
+		<span class="task-tags"></span>
+		<div class="task-actions">
+			<button class="btn-edit">Edit</button>
+			<button class="btn-delete">Delete</button>
+		</div>
+	</div>
+</template>
+
+<!-- Task form dialog -->
+<template id="t-task-dialog">
+	<dialog class="task-dialog">
+		<form method="dialog">
+			<h2 class="dialog-title"></h2>
+			<label>Title
+				<input name="title" type="text" required autocomplete="off">
+			</label>
+			<label>Body
+				<textarea name="body" rows="4"></textarea>
+			</label>
+			<label>Status
+				<select name="status">
+					<option value="open">Open</option>
+					<option value="deferred">Deferred</option>
+					<option value="done">Done</option>
+					<option value="cancelled">Cancelled</option>
+				</select>
+			</label>
+			<label>Priority
+				<select name="priority">
+					<option value="high">High</option>
+					<option value="normal" selected>Normal</option>
+					<option value="low">Low</option>
+				</select>
+			</label>
+			<label>Tags (comma-separated)
+				<input name="tags" type="text" autocomplete="off">
+			</label>
+			<div class="dialog-buttons">
+				<button type="submit" class="btn-save">Save</button>
+				<button type="button" class="btn-cancel">Cancel</button>
+			</div>
+		</form>
+	</dialog>
+</template>
--- a/server.mjs
+++ b/server.mjs
@@ -0,0 +1,82 @@
+process.on('unhandledRejection', (reason) => { console.error('[unhandledRejection]', reason); });
+process.on('uncaughtException',  (err)    => { console.error('[uncaughtException]',  err);    process.exit(1); });
+
+import express from 'express';
+import { next_id } from './lib/ids.mjs';
+import { list_tasks, get_task, set_task, delete_task } from './lib/storage.mjs';
+
+const app = express();
+app.use(express.json());
+app.use(express.static(new URL('./public/', import.meta.url).pathname));
+
+const PORT = process.env.PORT ?? 3025;
+const BIND_ADDRESS = process.env.BIND_ADDRESS ?? 'localhost';
+
+function ok(res, data = {}) { res.json({ ok: true, ...data }); }
+function fail(res, msg, status = 400) { res.status(status).json({ ok: false, error: msg }); }
+
+// ---------------------------------------------------------------------------
+// Tasks
+// ---------------------------------------------------------------------------
+
+app.get('/api/tasks', (req, res) => {
+	ok(res, { tasks: list_tasks() });
+});
+
+app.post('/api/tasks', (req, res) => {
+	const { title, body = '', status = 'open', priority = 'normal', tags = [] } = req.body;
+	if (!title?.trim()) { return fail(res, 'title is required'); }
+	const now = Date.now();
+	const task = {
+		id: next_id('task'),
+		title: title.trim(),
+		body: body.trim(),
+		status,
+		priority,
+		tags: Array.isArray(tags) ? tags : [],
+		created_at: now,
+		updated_at: now,
+	};
+	set_task(task);
+	ok(res, { task });
+});
+
+app.get('/api/tasks/:id', (req, res) => {
+	const task = get_task(Number(req.params.id));
+	if (!task) { return fail(res, 'not found', 404); }
+	ok(res, { task });
+});
+
+app.put('/api/tasks/:id', (req, res) => {
+	const existing = get_task(Number(req.params.id));
+	if (!existing) { return fail(res, 'not found', 404); }
+	const { title, body, status, priority, tags } = req.body;
+	const updated = { ...existing, updated_at: Date.now() };
+	if (title !== undefined) { updated.title = title.trim(); }
+	if (body !== undefined) { updated.body = body.trim(); }
+	if (status !== undefined) { updated.status = status; }
+	if (priority !== undefined) { updated.priority = priority; }
+	if (tags !== undefined && Array.isArray(tags)) { updated.tags = tags; }
+	set_task(updated);
+	ok(res, { task: updated });
+});
+
+app.delete('/api/tasks/:id', (req, res) => {
+	if (!delete_task(Number(req.params.id))) { return fail(res, 'not found', 404); }
+	ok(res);
+});
+
+// SPA fallback
+const INDEX_HTML = new URL('./public/index.html', import.meta.url).pathname;
+app.get('/{*path}', (req, res) => res.sendFile(INDEX_HTML));
+
+app.use((err, req, res, next) => {
+	console.error(`[express error] ${req.method} ${req.path}`, err);
+	if (!res.headersSent) {
+		res.status(500).json({ ok: false, error: err.message ?? 'Internal server error' });
+	}
+});
+
+app.listen(PORT, BIND_ADDRESS, () => {
+	console.log(`Task Inventory running on http://${BIND_ADDRESS}:${PORT}`);
+});