jaytail Buy jaytail

Open giant JSON logs instantly, right in your terminal.

jaytail opens multi-gigabyte JSON logs in the terminal, lets you search, filter and export them, and moves a log file between two machines peer-to-peer.

Buy jaytail See it in action

macOS, Linux, Windows · one binary · no account

Get started
$ jaytail app.log
$ jaytail send app.log
10 GiB / 54M linesOpen and navigate at once
First screen < 300 msEven with a cold page cache
~10 MiB RAMWhile viewing multi-GB files
Single native binary4 MiB Minimal · 14 MiB Complete

Investigate

Find what matters. Fast.

Filter by level, component or any field. Search a field or the raw text. Export the results or pipe them to the tools you already use.

Filter by log level

A threshold or an exact level, combined with field filters like component~payments.

Explore structured logs

zerolog, zap, logrus, slog and pino look right without configuration. Time, level and message are found for you.

Inspect the full record

Open any row and read the whole object, nested fields included. Nothing is truncated.

Export selected rows

CSV, JSON, JSONL or HTML. Or use --plain=table and pipe to jq, less or your own scripts.

Share

Get the whole log, not a chat paste.

Ask a customer for their log file, or send yours to a colleague. One command on each side, encrypted end to end, no account for the other party, nothing stored anywhere.

Ask for a file

you@laptop
customer@shop-prod
You
$ jaytail requestprints a ticket and the line to send
On their server
$ curl -fsSL https://jaytail.dev/install | sh && ~/.local/bin/jaytail send jaytail1… /var/log/app.jsonl

They run it themselves, on their own machine, for the one file you asked for. No SSH, no upload portal, no screenshots.

Send a file

you@laptop
You
$ jaytail send --qr checkout.jsonlprints a ticket and a QR code
On the other machine
$ jaytail receive jaytail1…

Or photograph the QR code: jaytail receive --qr-image photo.jpg.

jaytail started with a customer pasting a backend log into Telegram, one broken page at a time. It exists so that the next time, they can run one command and I get the file.

The developer of jaytail

Browser

Prefer a browser? Same view, on your machine.

Pricing

One-time purchase. No subscription.

Pay once, use it on all your machines. Launch prices until December 31, 2026.

Minimal
$9.99$14.99

One-time purchase · Launch price

Local JSON log viewing and investigation. No network code at all.

  • Table view, search, filters, record view
  • CSV, JSON, JSONL and HTML export
  • Pipes and --plain output
  • Auditable build for locked-down environments
Buy Minimal
Complete Recommended
$29.99$49.99

One-time purchase · Launch price

Everything in Minimal plus peer-to-peer transfers: send a file, or ask a customer for one.

  • Everything in Minimal
  • jaytail send and jaytail request with tickets and QR codes
  • Resumable transfers, relay fallback
  • 12 months of updates
Buy Complete
Complete Lifetime
$79.99$129.99

One-time purchase · Launch price

Everything in Complete, with all future versions included.

  • Everything in Complete
  • All future versions, no upgrade fees
  • Use on all your machines
  • No login required
Buy Lifetime
The other side never pays. Whether you send a file or ask for one, only your license is needed.

One-time payment · perpetual license · no subscription · 12 months of updates (Lifetime: all future versions) · free for the other party · license by e-mail within one business day
Prices in USD. VAT is added at checkout where applicable.

Single binaryDownload and run. No runtime, no dependencies.
Linux, macOS, WindowsNative builds for x86-64 and arm64 (Windows: x86-64).
No account, no telemetryViewing, searching and exporting never touch the network.
Nothing uploadedYour logs stay on your machine unless you start or answer a transfer.

FAQ

Questions

Do I need an account?

No. Your license is a short text you install once with jaytail license install. jaytail checks it offline; there is nothing to log in to.

How do I receive my license?

By e-mail, within one business day of your purchase, with the install instructions.

Can I use it on more than one machine?

Yes. A license is personal and works on all the machines you use. A company buys one license per person who uses jaytail.

What happens after the 12 months of updates?

The versions you have keep working forever. Newer releases are an optional paid upgrade. Complete Lifetime includes all future versions.

Does the other side need a license?

No. Whoever creates the ticket needs Complete: jaytail send FILE to offer a file, jaytail request to ask for one. The other side answers with the free binary: jaytail receive TICKET or jaytail send TICKET FILE.

What does my customer have to install?

One line on Linux and macOS, curl -fsSL https://jaytail.dev/install | sh, which needs no sudo and installs into ~/.local/bin; on Windows, irm https://jaytail.dev/install.ps1 | iex. jaytail request prints the complete line, ticket included.

What is the difference between Minimal and Complete?

Minimal contains no network code at all, for environments where networking tools are not allowed. Complete adds transfers: jaytail send and jaytail request.

Does jaytail send my logs anywhere?

Viewing, searching and exporting never touch the network. A file moves only in a transfer you start or answer, encrypted end to end, between the two machines that share the ticket.