localStorage-patterns

This skill provides a comprehensive guide to localStorage patterns for building resilient web applications with client-side persistence.

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Security score

The localStorage-patterns skill was audited on Feb 28, 2026 and we found 34 security issues across 3 threat categories. Review the findings below before installing.

Categories Tested

Security Issues

medium line 191

Template literal with variable interpolation in command context

SourceSKILL.md

191	console.log(`Usando ${usedMB} MB de ${quotaMB} MB (${(estimate.usage / estimate.quota * 100).toFixed(1)}%)`);

medium line 200

Template literal with variable interpolation in command context

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200	console.log(`- ${key}: ${(size / 1024).toFixed(2)} KB`);

medium line 364

Template literal with variable interpolation in command context

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364	const key = `plataforma-b2b_notes_${courseId}`;

medium line 370

Template literal with variable interpolation in command context

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370	console.error(`Erro ao salvar notas (${key}):`, error);

medium line 385

Template literal with variable interpolation in command context

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385	localStorage.setItem(`plataforma-b2b_notes_${courseId}`, notes); // Pode crashar!

medium line 406

Template literal with variable interpolation in command context

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406	const saved = localStorage.getItem(`plataforma-b2b_notes_${courseId}`);

medium line 422

Template literal with variable interpolation in command context

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422	localStorage.setItem(`plataforma-b2b_notes_${courseId}`, notes);

medium line 430

Template literal with variable interpolation in command context

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430	sessionStorage.setItem(`plataforma-b2b_notes_${courseId}_temp`, notes);

medium line 512

Template literal with variable interpolation in command context

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512	console.log(`Usando ${info.usedMB} MB de ${info.quotaMB} MB (${info.percentUsed}%)`);

medium line 536

Template literal with variable interpolation in command context

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536	message: `Nota muito grande (${sizeKB} KB). Limite: 50 KB.`

medium line 600

Template literal with variable interpolation in command context

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600	console.log(`Removido: ${key} (${ageInDays.toFixed(0)} dias)`);

medium line 604

Template literal with variable interpolation in command context

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604	console.warn(`Erro ao processar ${key}:`, error);

medium line 609

Template literal with variable interpolation in command context

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609	console.log(`Liberados ${freedKB} KB de armazenamento`);

medium line 666

Template literal with variable interpolation in command context

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666	console.log(`Migrado ${key} para v2`);

medium line 672

Template literal with variable interpolation in command context

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672	console.error(`Erro ao migrar ${key}:`, error);

medium line 707

Template literal with variable interpolation in command context

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707	return `plataforma-b2b_${type}_${identifier}`;

medium line 739

Template literal with variable interpolation in command context

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739	this.key = `plataforma-b2b_progress_${courseId}`;

medium line 929

Template literal with variable interpolation in command context

SourceSKILL.md

929	const key = `plataforma-b2b_notes_${courseId}`;

medium line 967

Template literal with variable interpolation in command context

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967	console.warn(`Nota muito grande: ${(sizeBytes / 1024).toFixed(2)} KB`);

medium line 994

Template literal with variable interpolation in command context

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994	sessionStorage.setItem(`${key}_temp`, notes);

medium line 1038

Template literal with variable interpolation in command context

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1038	const key = `plataforma-b2b_progress_${courseId}`;

medium line 1056

Template literal with variable interpolation in command context

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1056	console.log(`Módulo ${moduleId} já completo`);

medium line 1189

Template literal with variable interpolation in command context

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1189	localStorage.setItem(`item_${i}`, data[i]);

medium line 1295

Template literal with variable interpolation in command context

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1295	console.log(`Total usado: ${calculateTotalSize()} MB`);

medium line 1310

Template literal with variable interpolation in command context

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1310	console.log(`Removido: ${key}`);

medium line 1346

Template literal with variable interpolation in command context

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1346	console.log(`✅ ${key} válido`);

medium line 1348

Template literal with variable interpolation in command context

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1348	console.error(`❌ ${key} corrompido:`, error);

medium line 1364

Template literal with variable interpolation in command context

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1364	console.error(`Erro ao parsear ${key}:`, error);

medium line 1402

Template literal with variable interpolation in command context

SourceSKILL.md

1402	notes: (courseId) => `plataforma-b2b_notes_${courseId}`,

medium line 1403

Template literal with variable interpolation in command context

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1403	progress: (courseId) => `plataforma-b2b_progress_${courseId}`

medium line 1437

Template literal with variable interpolation in command context

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1437	console.log(`Escritas/segundo: ${writeCount}`);

low line 1174

Fetch to external URL

SourceSKILL.md

1174	await fetch('/api/auth/login', {

low line 1488

External URL reference

SourceSKILL.md

1488	- [Can I Use - localStorage](https://caniuse.com/namevalue-storage) - Suporte por browser

low line 1489

External URL reference

SourceSKILL.md

1489	- [Web.dev - Storage Limits](https://web.dev/storage-for-the-web/) - Limites detalhados

Scanned on Feb 28, 2026

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Categorydevelopment

UpdatedMay 21, 2026

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