twilight ventures

tools for data explorers

The export nobody dared open, the log that goes on for miles, the vault a running app still holds, the heap a machine left behind when it stopped. Somebody made all of these and walked away, and the record is what remains of whatever happened down there. As above, so below: the files beneath reveal the truth beyond a glance at the system that wrote them. Reading them is free in the plugins and the extensions. Processing them is the part we charge for. Dive deeper into the abyss, if you dare.

At twilight ventures we make tools for data explorers. The viewers open a file in the IDE or the editor, or an attachment on a Confluence page or a Jira issue, and load only the rows you are looking at; the first page of a 10 GB Parquet dataset, a multi-gigabyte log or a 500,000-row sheet is up while the rest is still being read. From there the file can be searched, sorted and filtered, profiled, exported, converted and compared, as far as each product goes. None of the products sends a file's contents anywhere. The plugins and extensions read the file on your machine, and the two Atlassian apps read an attachment inside your own Atlassian site, as the person viewing it, and it never leaves Atlassian; the security policy has the detail.

Here, take this.

what we make

jetbrains ides

• JSONL Lens

  JSON Lines and NDJSON files of any size, gzipped included

  filter, export, stats in Pro

• Log Lens

  multi-gigabyte plain, JSON lines, logfmt and ANSI logs, followed as they grow

  filter, statistics, export in Pro

• Parquet Lens

  Parquet, Avro, TFRecord, Arrow, Feather and HDF5 datasets, straight off disk

  filter, sort, export, profile in Pro

• SQLite Lens

  browser for SQLite database files, read-only by default, no lock taken

  saved edits, SQL console, export, diff, profile in Pro

• XLSX Lens

  Excel workbooks streamed read-only, sheets of any size

  export, sort, filter, diff, profile in Pro

• Notebook Lens

  Jupyter notebooks rendered as documents, outputs included, no kernel

  diff, search, export in Pro

• DuckDB Lens

  read-only browser for DuckDB database files, every schema in a tree

  SQL console, export, diff, sort in Pro

• Heap Dump Lens

  JVM heap dumps, thread dumps and GC logs, parsed in the editor

  retained sizes in Pro

vs code

• JSONL Lens for VS Code

  JSON Lines and NDJSON files of any size as a grid

  Open VSX and the Visual Studio Marketplace

• Parquet Lens for VS Code

  Parquet, Avro, TFRecord, Arrow IPC and Feather v2 files as a table

  Open VSX and the Visual Studio Marketplace

• Log Lens for VS Code

  log files of any size as a table, the levels counted over the whole file

  Open VSX and the Visual Studio Marketplace

confluence and jira

• Lens File, Log, & Attachment Viewer for Confluence

  CSV, JSONL, Parquet, Excel and log attachments as paged tables on the page

  Atlassian Marketplace

• Lens File, Log, & Attachment Viewer for Jira

  logs, CSV, JSONL, Parquet and Excel attachments as paged tables on the issue

  Atlassian Marketplace

what opens where

Twenty-one file formats across thirteen products in one table. Pick a format to land on its row.

• JSONL
• NDJSON
• gzipped JSONL
• plain logs
• logfmt
• ANSI logs
• CSV
• TSV
• Parquet
• Avro
• TFRecord
• Arrow IPC
• Feather
• SQLite
• DuckDB
• XLSX
• XLSM
• Jupyter notebooks
• HPROF heap dumps
• thread dumps
• GC logs

what's new

• 

  JSONL Lens 2.0.0published 2026-10-27

  With 2.0.0, records can be edited in JSONL Lens. full note

• 

  XLSX Lens 1.7.0published 2026-10-27

  With 1.7.0, cells can be edited in XLSX Lens. full note

• 

  Notebook Lens 1.3.1published 2026-10-27

  The 1.3.0 cut, uploaded a second time; nothing in the plugin changed. full note

The newest note of every product, latest first.

free and pro

In the plugins and the extensions, viewing is free, and the free tier is the complete viewer rather than a demo. Pro is the paid tier of each of them and holds the heavier work: a filter or a sort over every record, the exports, the profile report on the products that have one, the SQL consoles. On the JetBrains Marketplace Pro is a subscription per plugin, and every plugin starts its own 30-day trial of it. For VS Code, Pro is one subscription from Polar that serves all three Lens extensions there, and each machine gets a 30-day trial with no key to enter. The two Atlassian apps have no Pro tier: the marketplace prices the whole app, a site of up to ten users pays nothing, and a larger site pays for every user, as the two listings show.

support and security

• support
• security policy
• privacy
• about
• guides

Write to support@twilightventures.dev about a product or a purchase, to sales@twilightventures.dev about pricing, invoices and licensing, and to security@twilightventures.dev about a security problem only.