---
id: kb-2026-00085
title: IndexedDB
schema_type: TechArticle
category: computer-science
language: en
confidence: medium
last_verified: "2026-05-28"
created_date: "2026-05-22"
generation_method: human_only
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-computer-science-indexeddb-001
    statement: >-
      IndexedDB is a browser API for client-side storage of significant amounts of structured data, including files and
      blobs.
    source_title: IndexedDB API - Web APIs | MDN
    source_url: https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API
    confidence: medium
  - id: fact-computer-science-indexeddb-002
    statement: >-
      The Indexed Database API specification defines object stores, indexes, transactions, database connections, and
      asynchronous request execution.
    source_title: Indexed Database API 3.0
    source_url: https://www.w3.org/TR/IndexedDB/
    confidence: medium
  - id: fact-computer-science-indexeddb-003
    statement: MDN describes IndexedDB operations as asynchronous and notes that access follows the web same-origin policy.
    source_title: IndexedDB API - Web APIs | MDN
    source_url: https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API
    confidence: medium
completeness: 0.86
known_gaps:
  - This public sample was manually narrowed to source-backed facts on 2026-05-28.
disputed_statements: []
primary_sources:
  - title: Indexed Database API 3.0
    type: standard
    year: 2025
    url: https://www.w3.org/TR/IndexedDB/
    institution: W3C
  - title: IndexedDB API - Web APIs | MDN
    type: documentation
    year: 2026
    url: https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API
    institution: Mozilla
  - title: Using IndexedDB - Web APIs | MDN
    type: documentation
    year: 2026
    url: https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API/Using_IndexedDB
    institution: Mozilla
secondary_sources: []
updated: "2026-05-28"
---

## TL;DR

IndexedDB is an asynchronous browser database API for structured client-side storage. This repair removes vague size claims and ties the article to the W3C specification and MDN.

## Core Explanation

IndexedDB stores data in object stores and uses transactions for database work. Applications open a database, handle schema upgrades by version, and perform asynchronous requests rather than blocking the main thread.

## Further Reading

- [Indexed Database API 3.0](https://www.w3.org/TR/IndexedDB/)
- [IndexedDB API - Web APIs | MDN](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API)
- [Using IndexedDB - Web APIs | MDN](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API/Using_IndexedDB)