Browser automation CLI — wraps cdpwave and bidiwave

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Browser automation CLI — wraps cdpwave and bidiwave. No Node.js, no Chromium download. Uses your existing Chrome/Edge. 117 CLI commands, 743 backend methods, full CDP + BiDi parity.

Why wavexis?

wavexis is a command-line tool for browser automation. It wraps the cdpwave (Chrome DevTools Protocol) and bidiwave (WebDriver BiDi) libraries, exposing their capabilities through a single unified CLI. You don't need Node.js, Playwright, or a separate Chromium download — wavexis launches your existing Chrome or Edge installation directly.

Core concepts

• Backend — The browser driver that executes commands. wavexis supports two backends with full feature parity: CDP (default, via cdpwave) and BiDi (via bidiwave). Both implement all 743 methods across 60 CDP domains and 12 BiDi modules, so you can switch with --backend bidi without losing functionality.
• Action — A single operation (screenshot, eval, click, etc.). Each action maps to a CLI command or a step in a multi-action YAML config.
• Multi-action — A YAML config that chains multiple actions in sequence on a single browser session. Avoids the overhead of launching a browser per action.
• Serve mode — An HTTP API server that exposes all wavexis commands as REST endpoints with WebSocket streaming for real-time events.

Install

pip install wavexis[cdp]

Docker

Serve mode in a container with Chromium pre-installed:

docker run -p 8080:8080 ghcr.io/mathiaspaulenko/wavexis:latest

curl -X POST http://localhost:8080/screenshot \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com"}' \
  -o screenshot.png

Build locally:

docker build -t wavexis .
docker run -p 8080:8080 wavexis

Quick start

# Take a screenshot
wavexis screenshot https://example.com -o out.png

# Full-page screenshot
wavexis screenshot https://example.com -o full.png --full-page

# Screenshot of a specific element
wavexis screenshot https://example.com -o el.png --selector "h1"

# Generate a PDF
wavexis pdf https://example.com -o out.pdf --paper a4

# Evaluate JavaScript
wavexis eval https://example.com -e "document.title"

# Scrape page content
wavexis scrape https://example.com --selector "article"

# Emulate a device
wavexis device https://example.com --preset iphone-15 -o shot.png

REPL

Interactive REPL for live browser sessions. Launch a non-headless browser and execute commands in real time:

wavexis repl

Inside the REPL:

wavexis> navigate https://example.com
wavexis> screenshot
wavexis> eval document.title
wavexis> click #login-button
wavexis> type #username admin@example.com
wavexis> cookies
wavexis> url
wavexis> title
wavexis> wait 2
wavexis> back
wavexis> help
wavexis> exit

Supported commands: navigate, screenshot, eval, click, type, fill, hover, key, cookies, url, title, wait, back, forward, reload, help, exit/quit.

Init wizard

Generate a wavexis.yaml config interactively from predefined templates:

wavexis init

Or generate directly with flags:

wavexis init -t multi-step -u https://example.com -s "#login" --text "admin" -o config.yaml

List available templates:

wavexis init --list

Templates: screenshot, pdf, scrape, eval, multi-step, cookies, har.

CI assertions

Use --assert with eval to create CI gates that pass or fail based on the result:

# Equality check — exit 0 if title matches, 1 otherwise
wavexis eval https://example.com -e "document.title" --assert "== Expected Title"

# Inequality
wavexis eval https://example.com -e "document.title" --assert "!= Old Title"

# Substring
wavexis eval https://example.com -e "document.body.innerText" --assert "contains Welcome"

# Regex
wavexis eval https://example.com -e "document.title" --assert "matches Error \\d+"

Output includes assert:, result:, and status: PASS/FAIL. Exit code 0 on pass, 1 on fail.

Stealth mode

Enable anti-bot stealth mode to hide headless browser indicators. Useful for scraping protected sites:

# Global flag — applies to all commands
wavexis --stealth screenshot https://example.com -o out.png
wavexis --stealth scrape https://protected-site.com --selector "article"

Stealth mode hides navigator.webdriver, fakes plugins, languages, chrome runtime, WebGL vendor/renderer, permissions API, navigator.connection, hardwareConcurrency, deviceMemory, and platform. Works with both CDP and BiDi backends.

Action caching

Cache action results to avoid re-analyzing pages when running multi-action workflows repeatedly:

# Cache results for 60 seconds
wavexis multi actions.yml --cache-ttl 60

Cacheable actions: screenshot, dom, scrape, eval, cookies, headers. Cache is keyed by URL, action type, and params hash.

WebExtension management

Install, uninstall, and list browser extensions:

# Install an unpacked extension directory
wavexis extension-install /path/to/extension/

# Install a .crx file
wavexis extension-install /path/to/extension.crx

# List installed extensions
wavexis extension-list

# Uninstall by extension ID
wavexis extension-uninstall <extension-id>

Browser preferences

Get and set browser preferences programmatically:

# Get a preference
wavexis pref-get download.default_directory

# Set a preference
wavexis pref-set download.default_directory /tmp/downloads

Performance metrics

Capture Core Web Vitals and performance data:

# Key metrics (LCP, FCP, CLS, TTFB) with human-readable summary
wavexis perf https://example.com

# CPU trace
wavexis perf https://example.com -m trace -d 5000 -o trace.json

# CPU profile
wavexis perf https://example.com -m profile -o profile.json

# JS code coverage
wavexis perf https://example.com -m coverage -o coverage.json

# CSS coverage
wavexis perf https://example.com -m css-coverage -o css-coverage.json

# Heap snapshot
wavexis perf https://example.com -m heap-snapshot -o heap.json

Metrics: metrics (default), trace, profile, heap-snapshot, coverage, css-coverage.

Core Web Vitals scoring

Measure LCP, CLS, INP with actionable ratings and a 0-100 score:

# Basic measurement
wavexis cwv https://example.com

# With CI budgets (fails if thresholds exceeded)
wavexis cwv https://example.com --budget '{"lcp_ms":2500,"cls":0.1,"inp_ms":200}'

# Save report to file
wavexis cwv https://example.com -o cwv-report.json

Ratings: good / needs-improvement / poor based on official Google thresholds.

Metric	Good	Poor
LCP	< 2500ms	> 4000ms
CLS	< 0.1	> 0.25
INP	< 200ms	> 500ms

Request modification

Intercept and modify network requests and responses in-flight:

# Modify request headers for matching URLs
wavexis modify https://example.com -p "*/api/*" --header "X-Custom: value"

# Modify response body
wavexis modify-response https://example.com -p "*/api/*" -b '{"modified":true}' -s 200

# Keep browser open for interception
wavexis modify https://example.com -p "*/api/*" --wait 10

Auth

Store and use browser credentials for authenticated scraping:

# Save credentials
wavexis auth save mysite --user admin --pass secret123

# Use saved credentials
wavexis auth use mysite --url https://example.com/login

# List saved profiles
wavexis auth list

# Delete a profile
wavexis auth delete mysite

Record & Replay

Record a browser session and replay it later:

# Record a session
wavexis record start https://example.com -o session.json

# Replay a recorded session
wavexis record replay session.json

# List recorded sessions
wavexis record list

Serve mode

HTTP API server powered by aiohttp with WebSocket streaming:

wavexis serve --host 0.0.0.0 --port 8080

# With rate limiting (60 requests/min)
wavexis serve --host 0.0.0.0 --port 8080 --rate-limit 60

curl -X POST http://localhost:8080/screenshot \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com"}' \
  -o screenshot.png

WebSocket endpoint at /ws for real-time streaming of screenshots, console events, navigation, DOM mutations, and performance metrics:

import aiohttp, json, asyncio

async def stream():
    async with aiohttp.ClientSession() as s:
        async with s.ws_connect("ws://localhost:8080/ws") as ws:
            await ws.send_json({"url": "https://example.com", "events": ["screenshot"], "interval": 2.0})
            async for msg in ws:
                data = json.loads(msg.data)
                if data["type"] == "screenshot":
                    print(f"Got frame ({len(data['data'])} bytes)")

asyncio.run(stream())

Multi-action

Create a YAML config and run multiple actions in sequence on a single browser session:

# actions.yml
actions:
  - screenshot:
      url: https://example.com
      full_page: true
  - eval:
      url: https://example.com
      expression: document.title
  - pdf:
      url: https://example.com
      paper: a4

wavexis multi actions.yml

Watch mode

Re-execute the config automatically when the file changes. Useful for iterative config development:

wavexis multi actions.yml --watch

Dry run

Validate the config and show the planned actions without launching a browser:

wavexis multi actions.yml --dry-run

Supported action types

Action	Key parameters
screenshot	url, full_page, format
pdf	url, paper, landscape
eval	url, expression, await_promise
dom	url, action, selector
navigate	url
scrape	urls, expression
click	url, selector
type	url, selector, text
cookies	url, action (get/set/delete/clear), cookie
headers	url, action (set-headers/set-user-agent), headers, user_agent

Cookies and headers in multi

actions:
  - cookies:
      url: https://example.com
      action: get
  - headers:
      url: https://example.com
      action: set-headers
      headers:
        X-Custom-Header: my-value
  - screenshot:
      url: https://example.com

Backends

wavexis supports two backends with full feature parity:

• CDP (cdpwave) — default, Chrome DevTools Protocol. pip install wavexis[cdp]
• BiDi (bidiwave) — WebDriver BiDi protocol, uses BiDi native + JS workarounds + CDP bridge. pip install wavexis[bidi]

Select with --backend:

wavexis --backend bidi screenshot https://example.com -o out.png

Graceful backend degradation

If the preferred backend fails to initialize (e.g. dependency not installed), wavexis automatically falls back to the next available backend:

# Prefers CDP, falls back to BiDi if cdpwave is not installed
wavexis screenshot https://example.com -o out.png

# Prefers BiDi, falls back to CDP if bidiwave is not installed
wavexis --backend bidi screenshot https://example.com -o out.png

Feature parity (v2.13.0)

Both backends implement all 743 methods across 60 CDP domains and 12 BiDi modules. BiDi uses native BiDi commands, JS workarounds (script.evaluate), or the CDP bridge (browser.cdp.sendCommand) when needed. Zero uncovered methods.

Category	Methods	BiDi impl
Navigation	navigate, go_back, go_forward, reload, stop_loading, wait_for	BiDi native
Screenshots	screenshot, screenshot_selector, pdf, screencast	BiDi + CDP
Tabs	list_tabs, new_tab, close_tab, activate_tab	BiDi native
DOM	dom_get, dom_query, dom_set_attr, dom_get_attr, dom_remove, dom_focus, dom_scroll, dom_snapshot	BiDi + JS
Cookies	get_cookies, set_cookie, delete_cookie, clear_cookies	BiDi native
Network	set_headers, set_user_agent, block_requests, throttle_network, set_cache_disabled, intercept_requests, mock_response	BiDi + CDP
Emulation	emulate_device, set_viewport, set_geolocation, set_timezone, set_dark_mode, set_locale, set_touch_emulation, set_cpu_throttle, set_sensors	BiDi + CDP
Browser	browser_version, eval, raw, capture_console, capture_logs	BiDi native
Security	get_security_state, ignore_cert_errors	CDP bridge
Contexts	new_context, list_contexts, close_context, get_window_bounds, set_window_bounds	BiDi native
Input	click, type_text, fill, select_option, hover, key_press, drag, tap	JS + BiDi
Storage	storage_get, storage_set, storage_clear, storage_list	BiDi native
Dialogs	dialog_accept, dialog_dismiss, grant_permission, reset_permissions	BiDi native
Performance	perf_metrics, perf_coverage, perf_css_coverage, perf_trace, perf_profile, perf_heap_snapshot	CDP bridge
CSS	css_get_styles, css_get_computed, css_get_stylesheets, css_get_rules	JS
Overlay	overlay_highlight, overlay_clear	JS
Accessibility	a11y_tree, a11y_node, a11y_ancestors	CDP bridge
Downloads	intercept_download	CDP bridge
Debug	debug_set_breakpoint, debug_set_breakpoint_function, debug_remove_breakpoint, debug_step_over, debug_step_into, debug_step_out, debug_pause, debug_resume, debug_get_listeners	CDP bridge
Cache Storage	cache_storage_list, cache_storage_entries, cache_storage_delete	JS
IndexedDB	indexeddb_list, indexeddb_get_data, indexeddb_clear	CDP bridge
Service Workers	sw_list, sw_unregister, sw_update	JS
Animations	animation_list, animation_pause, animation_play, animation_seek	JS
HAR	capture_har	CDP bridge
WebAuthn	webauthn_add_virtual_authenticator, webauthn_remove_authenticator, webauthn_add_credential, webauthn_get_credentials	CDP bridge
WebAudio	webaudio_get_contexts, webaudio_get_context	CDP bridge
Media	media_get_players, media_get_messages	CDP bridge
Cast	cast_list, cast_start_tab, cast_stop	CDP bridge
Bluetooth	bluetooth_emulate, bluetooth_stop	CDP bridge
Extensions	extension_install, extension_uninstall, extension_list	CDP bridge
Preferences	get_pref, set_pref	CDP bridge
Stealth	stealth JS injection on launch	JS
Debugger	debugger_pause, debugger_resume, debugger_step_into, debugger_step_over, debugger_step_out, debugger_set_breakpoint, +27 more	CDP bridge
Heap Profiler	heap_profiler_take_heap_snapshot, heap_profiler_start_sampling, +10 more	CDP bridge
DOM Debugger	dom_debugger_get_event_listeners, dom_debugger_set_breakpoint, +8 more	CDP bridge
DOM Storage	dom_storage_clear, dom_storage_get_items, +5 more	CDP bridge
Event Breakpoints	event_breakpoints_set, event_breakpoints_clear, +2 more	CDP bridge
FedCM	fedcm_enable, fedcm_disable, +5 more	CDP bridge
Fetch	fetch_enable, fetch_disable, fetch_continue_request, +8 more	CDP bridge
File System	file_system_get_directory	CDP bridge
Headless	headless_begin_frame, headless_disable, headless_enable	CDP bridge
IO	io_read, io_write, io_close	CDP bridge
Layer Tree	layer_tree_enable, layer_tree_disable, +7 more	CDP bridge
Log	log_enable, log_disable, log_clear, log_start_violations, log_stop_violations	CDP bridge
Memory	memory_get_sampling_profile, memory_start_sampling, +9 more	CDP bridge
Page	page_enable, page_disable, page_reload, +62 more	CDP bridge
Profiler	profiler_start, profiler_stop, profiler_get_profile, +6 more	CDP bridge
Runtime	runtime_evaluate, runtime_compile_script, runtime_run_script, +21 more	CDP bridge
Schema	schema_get_domains	CDP bridge
Sensor	sensor_set_sensor_reading_enabled, +3 more	CDP bridge
Smart Card	smart_card_emulation_enable, smart_card_emulation_disable, +10 more	CDP bridge
System Info	system_info_get_info, system_info_get_process_info, system_info_get_feature_state	CDP bridge
Target	target_create_target, target_close_target, target_get_targets, +16 more	CDP bridge
Tethering	tethering_bind, tethering_unbind	CDP bridge
Tracing	tracing_start, tracing_end, tracing_get_categories, +3 more	CDP bridge
WebMCP	web_mcp_enable, web_mcp_disable	CDP bridge
Worker	worker_created, worker_disconnected	CDP bridge
Crash Report	crash_report_context_get_entries	CDP bridge
Device Access	device_access_enable, device_access_disable, device_access_select_device, device_access_cancel_prompt	CDP bridge
Device Orientation	device_orientation_set_orientation, device_orientation_clear_orientation	CDP bridge
Digital Credentials	digital_credentials_get_credentials	CDP bridge
Inspector	inspector_enable, inspector_disable	CDP bridge
Performance Timeline	performance_timeline_enable	CDP bridge
Preload	preload_enable, preload_disable	CDP bridge
PWA	pwa_get_install_state, pwa_install, pwa_uninstall, +4 more	CDP bridge

Commands

wavexis provides 117 CLI commands organized into categories:

Category	Commands
Capture	screenshot, pdf, screencast, scrape
Navigate	navigate, back, forward, reload, stop, tabs
Console	console (with --capture, --format), logs, har
Cookies	cookies (get/set/delete/clear)
Network	headers, user-agent, block, throttle, cache, intercept, mock
Browser	open, close, version
Emulation	device, viewport, geolocation, timezone, dark-mode
Input	click, type, fill, select, hover, key, drag, tap
CSS	css-styles, css-computed, css-rules
Debug	debug-break, debug-step, debug-pause, debug-resume
Performance	perf (metrics, trace, profile, coverage, heap-snapshot, css-coverage), cwv (Core Web Vitals scoring)
Storage	storage (get/set/clear/list), indexeddb
Advanced	sw, animation, record, replay, webauthn, cast, bluetooth, extension-install, extension-uninstall, extension-list
Preferences	pref-get, pref-set
Auth	auth save, auth use, auth list, auth delete
Serve	serve (HTTP API server)
Interactive	repl (live browser REPL), init (config wizard)
Network inspection	inspect, modify, modify-response, har-replay
Tracing	trace (start/stop unified tracing)
Accessibility	axe (accessibility audit)
Events	events (subscribe/unsubscribe to browser events)
Natural language	nl (click/fill/find using natural language selectors)
Shadow DOM	shadow (click/fill/eval inside shadow roots)
Batch	batch (process multiple URLs from file)
Crawl	crawl (crawl website collecting titles and links)
Utility	multi (with --watch, --dry-run, --parallel, --cache-ttl), raw, backends, install_check, completions, plugins

Run wavexis --help for the full list.

Comparison

Feature	wavexis	shot-scraper	Playwright
Language	Python	Python	Multi
Node.js required	No	Yes	Yes
Chromium download	No	Yes	Yes
CDP backend	Yes	Yes	Yes
BiDi backend	Yes	No	No
BiDi/CDP parity	Yes	N/A	No
CLI-first	Yes	Yes	No
Multi-action YAML	Yes	No	No
Device emulation	Yes	Yes	Yes
HAR capture	Yes	No	Yes
PDF generation	Yes	Yes	Yes
Network throttling	Yes	No	Yes
Cookie management	Yes	No	Yes
Session recording	Yes	No	No
Auth profiles	Yes	No	No
Serve mode (HTTP API)	Yes	No	No
Debug breakpoints	Yes	No	No
WebAuthn	Yes	No	No
Shell completions	Yes	No	No
Interactive REPL	Yes	No	No
Config wizard	Yes	No	No
CI assertions	Yes	No	No
Performance metrics	Yes	No	No
Watch mode	Yes	No	No
Action caching	Yes	No	No
Stealth mode	Yes	No	No
WebExtension management	Yes	No	No
Browser preferences	Yes	No	No
Live event streaming	Yes	No	No
Core Web Vitals scoring	Yes	No	No
Request modification	Yes	No	No
Rate limiting (serve)	Yes	No	No
Backend degradation	Yes	No	No
Site crawling	Yes	No	No
Accessibility audit	Yes	No	No
WebSocket inspection	Yes	No	No
Visual diff	Yes	No	No
Full CDP domain coverage (60 domains)	Yes	No	No
Heap profiler	Yes	No	No
Smart card emulation	Yes	No	No
System info	Yes	No	No
Tethering	Yes	No	No
WebMCP	Yes	No	No

Documentation

Full docs at mathiaspaulenko.github.io/wavexis.

License

MIT