{"slug":"leveldb-ops","title":"leveldb-ops","summary":"Read and inspect LevelDB stores - especially Chromium/Electron app state (Local Storage, IndexedDB, Session Storage). Triggers on: leveldb, .ldb files, IndexedDB, Local Storage, Chromium storage, Electron app state, claude.ai cache, browser forensics, decode app state, claude des","platform":"Claude","tags":[],"authorName":"LLM Mart","authorSlug":"llm-mart","score":0,"source":"github","price":null,"verified":false,"createdAt":"2026-09-30T19:36:47.86094Z","repo":{"url":"https://github.com/0xDarkMatter/claude-mods","stars":43,"forks":7,"license":"MIT","updatedAt":"2026-09-30T15:18:48Z"},"bodyHtml":"
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name: leveldb-ops\ndescription: \"Read and inspect LevelDB stores - especially Chromium/Electron app state (Local Storage, IndexedDB, Session Storage). Triggers on: leveldb, .ldb files, IndexedDB, Local Storage, Chromium storage, Electron app state, claude.ai cache, browser forensics, decode app state, claude desktop state.\"\nlicense: MIT\ncompatibility: \"Pure Python via ccl_chromium_reader. Works on Windows/macOS/Linux. No native compilation.\"\nallowed-tools: \"Read Write Bash\"\nmetadata:\nauthor: claude-mods

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LevelDB Operations

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Read and decode LevelDB stores — primarily the Chromium/Electron storage layers (Local Storage, IndexedDB, Session Storage) used by every Electron app on disk: Claude Desktop, VS Code, Discord, Slack, Obsidian.

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What is LevelDB

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Embedded key-value store by Google. Sorted KV map, no SQL, no server. Format: a folder of .ldb (sorted runs), .log (write-ahead), MANIFEST-*, CURRENT, LOCK. Both keys and values are arbitrary bytes.

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Chromium layers richer formats on top:

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When This Skill Triggers

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Critical Safety Protocol

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LevelDB uses an exclusive LOCK file. A running app holds it. Trying to open a live store fails OR silently returns stale snapshots.

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Always copy before reading:

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# Copy the entire leveldb dir to a temp location\ncp -r \"$APPDATA/Claude/Local Storage/leveldb\" /tmp/probe/local-storage-db\ncp -r \"$APPDATA/Claude/IndexedDB/https_claude.ai_0.indexeddb.leveldb\" /tmp/probe/indexeddb\n\n# Remove the copied LOCK file so the reader can open it\nrm -f /tmp/probe/local-storage-db/LOCK /tmp/probe/indexeddb/LOCK\n
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The cp -r will warn Device or resource busy for the LOCK file itself — that's fine, the data files copy successfully.

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Never write to the live store while the app is running. It will corrupt the LSM and crash the app. Quit the app first if you need to mutate.

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Setup

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plyvel and similar require native compilation and lack Windows wheels. Use ccl_chromium_reader — pure Python, written for browser forensics.

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uv venv .venv --python 3.13\nsource .venv/Scripts/activate          # or .venv/bin/activate on Unix\nuv pip install \"git+https://github.com/cclgroupltd/ccl_chrome_indexeddb.git\"\n
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Not on PyPI — install direct from GitHub. Pulls in ccl-simplesnappy and brotli as transitive deps.

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Reading Local Storage

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Storage keys are origin URLs (https://claude.ai). Records are append-only — duplicate script_key entries mean older versions; the last record wins.

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import pathlib\nfrom ccl_chromium_reader import ccl_chromium_localstorage\n\nls = ccl_chromium_localstorage.LocalStoreDb(pathlib.Path(\"./local-storage-db\"))\n\n# List all origins\nfor origin in sorted(set(ls.iter_storage_keys())):\n    print(origin)\n\n# Dump one origin, latest-value-wins\nlatest = {}\nfor rec in ls.iter_records_for_storage_key(\"https://claude.ai\"):\n    latest[rec.script_key] = rec.value\nfor k, v in latest.items():\n    print(f\"{k}: {repr(v)[:200]}\")\n
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See scripts/dump_localstorage.py for the full reusable script.

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Reading IndexedDB

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IndexedDB is more complex — wrapped object stores with v8-serialized values. ccl_chromium_reader parses it cleanly:

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from ccl_chromium_reader import ccl_chromium_indexeddb\n\ndb = ccl_chromium_indexeddb.WrappedIndexDB(pathlib.Path(\"./indexeddb\"))\nfor db_id in db.database_ids:\n    wdb = db[db_id.dbid_no]\n    print(f\"DB: {wdb.name}\")\n    for store_name in wdb.object_store_names:\n        store = wdb[store_name]\n        for rec in store.iterate_records():\n            print(f\"  {rec.key!r} -> {repr(rec.value)[:200]}\")\n
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See scripts/dump_indexeddb.py.

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Common Chromium Storage Locations

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OSPath
Windows%APPDATA%\\<App>\\Local Storage\\leveldb\\
Windows%APPDATA%\\<App>\\IndexedDB\\https_<host>_0.indexeddb.leveldb\\
macOS~/Library/Application Support/<App>/Local Storage/leveldb/
Linux~/.config/<App>/Local Storage/leveldb/
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For raw browsers, <App> is Google/Chrome/User Data/Default, BraveSoftware/Brave-Browser/User Data/Default, etc.

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Mutation (Advanced)

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Writing requires either:

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  1. Quitting the app and using a leveldb writer (Node level package, or rebuild the dir manually) — or
    2. \n
  2. Patching via the app itself — many Electron apps expose DevTools. Open with the --remote-debugging-port=<n> flag, attach, and call localStorage.setItem(key, value). Survives the app's normal write path so it doesn't corrupt the LSM.
    3. \n
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For Claude Desktop specifically, see references/claude-desktop-state.md for the discovered key map.

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Decision Framework

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You want toDo
Just see what's thereCopy + ccl_chromium_reader
Find a specific valuestrings + grep first; reader if structure matters
Mutate while app runsDon't. Use DevTools remote debugging.
Mutate while app is closedQuit, then Node level package or write back via re-opened leveldb
Cross-account recoveryRead-only forensics; can't impersonate server-bound entries
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Anti-patterns

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Reference

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