Installation

Peep has two parts: the client you add to your app, and the viewer where the cards appear.

1. The viewer

Pick one:

• Desktop app (macOS, Windows, Linux): download it from the releases page and open it. It brings its own PHP; nothing else is needed. It is not signed yet, so macOS and Windows need one extra step the first time: see Desktop app: install.

• peep-server.phar (needs PHP 8.5): download it from the releases page and run

  php peep-server.phar serve          # opens http://127.0.0.1:23517 in your browser

  Options: --port=9000, --open=browser|window|none, --host=0.0.0.0 (needs a token, see Docker below). Without options, the port and display mode come from the viewer's Settings.

Check the download against SHA256SUMS on the same release.

2. The client

With Composer (recommended)

composer require shibbirweb/peep --dev

The client runs on PHP 7.1 to 8.5. Laravel (5.5 to 13) picks it up on its own. Elsewhere, Composer's autoloader is all you need.

Without Composer

The global install loads Peep into every script a PHP install runs:

php peep.phar install

3. Turn it on

Peep is off until you turn it on, so it never runs by accident in production.

• Laravel: on in every environment except production. Force it with PEEP_ENABLED=true or false in .env.

• Anything else: PEEP_ENABLED=true in the environment, or a peep.php file in the project root:

  <?php
  
  return [
      'enabled' => true,
      'project' => 'shop',
  ];

4. Send something

Put this anywhere in your code, then run that code (open the page, run the command or the test):

peep('Hello from my app');
peep($user);
peep()->table($rows);

A card appears in the viewer. Nothing there? See Troubleshooting. Every method is in the API reference.

Laravel in a minute

Logs, reported exceptions, dump() and sent mail show up without any call. A few lines show the rest:

peep()->showQueries();                         // every query, with bindings and time
peep()->showSlowQueries(100);                  // queries slower than 100 ms
peep()->showDuplicateQueries();                // the same query run again (N+1)
peep()->countQueries(fn () => $order->load('items'));
peep()->showJobs()->showHttpClientRequests();
peep()->model($user);
collect($rows)->peep()->map(...);

Set MAIL_MAILER=peep to send every mail to the viewer's inbox. More in the Laravel guide.

Debugging with an AI agent

The Peep skill teaches Claude Code, Codex, Cursor and other agents to add peep() calls, read what was caught, fix the bug and clean up:

vendor/bin/peep skill --install                  # the Peep skill, for Claude Code
claude mcp add peep -- php vendor/bin/peep mcp   # optional: Peep's MCP tools

Then ask: "Use Peep to find out why checkout fails, fix it, and show me the report." See AI agents.

Docker and other machines

On Docker Desktop (macOS, Windows) and OrbStack, point the app at your machine:

PEEP_HOST=host.docker.internal
PEEP_REMOTE_PATH=/var/www/html          # the path in the container
PEEP_LOCAL_PATH=/Users/you/code/shop    # the same folder on your machine, for editor links

On Linux, and for apps on another computer, the viewer has to listen beyond your machine, which needs a token:

1. In the viewer's Settings, generate a token and save.
2. Start the viewer with --host=0.0.0.0 (or set the host in Settings and restart).
3. Give the app PEEP_TOKEN=... and PEEP_HOST (your machine's address; in Docker on Linux, start the container with --add-host=host.docker.internal:host-gateway).

Other machines can then send to the viewer, but the viewer page itself still opens only on your machine.

All client options

Option (peep.php)	Environment	Default
enabled	PEEP_ENABLED	off (Laravel: on outside production)
host	PEEP_HOST	127.0.0.1
port	PEEP_PORT	23517
project	PEEP_PROJECT	default (Laravel: APP_NAME)
remote_path, local_path	PEEP_REMOTE_PATH, PEEP_LOCAL_PATH	none
serializer	PEEP_SERIALIZER	peep; var-dumper uses Symfony VarDumper's casters
token	PEEP_TOKEN	none
log_path, log_timezone	PEEP_LOG_PATH, PEEP_LOG_TIMEZONE	none (Laravel: storage/logs and app.timezone); the folder the Logs tab shows
max_depth, max_items, max_string_length, max_nodes		5, 100, 10,000, 5,000
redact_keys		password, secret, token, api_key, authorization, cookie and more