Js Reverse MCP

Tools Js Reverse MCP exposes (24)

Listed by the server itself during our scan of commit bf7dc50.

• break_on_xhr

  Sets a URL-substring breakpoint for a future XHR/Fetch when runtime request arguments, local variables, or payload construction must be inspected. For an already captured request, call get_request_initiator first because it is non-pausing; use this only when that evidence is insufficient. Set it bef

• clear_network_requests

  Discard captured HTTP(S) evidence for the currently selected page after confirm=true. Use this immediately before reproducing an action when a clean network capture window is needed; do not use it to reset login, cookies, cache, or other browser state. It irreversibly clears the in-memory request qu

• clear_site_data

  Irreversibly clear browser state after confirm=true to create a clean replay environment for the selected page. Use this before replaying login, session creation, storage initialization, or other state-dependent flows; do not use it to inspect cookies or determine which response set one. For cookie

• click_element

  Performs one verified, auditable click in the currently selected frame. Use it when the task requires activating a known button, link, or control after selecting the correct page/frame and identifying a CSS selector; it is the preferred minimal interaction primitive over arbitrary evaluate_script co

• evaluate_script

  Evaluates one focused JavaScript function for DOM/page state, web storage, page-defined globals, a paused-frame expression, or browser-side processing of one local file. Use it when those runtime values are the goal and no narrower evidence tool applies. Do not use document.cookie or page evaluation

• get_paused_info

  Inspects the current call stack, source locations, and selected call-frame scopes after a code/XHR breakpoint or explicit pause has stopped execution. It neither creates a pause nor resumes one. Returned frameIndex values and callFrameIds belong only to the current pause and expire after any step or

• get_request_initiator

  Non-pausing first action for tracing which JavaScript initiated a retained HTTP request when CDP initiator evidence was active. Pass the reqid from list_network_requests; because initiator capture starts lazily and is not retroactive, an older request may have no stack—in that case reproduce the act

• get_script_source

  Reads a small source region around a search match, paused location, or known statement without executing or pausing the page. Select by URL when available because URL-backed scripts can be resolved again after navigation; use the debugger-context-scoped scriptId only for current inline/eval scripts.

• get_websocket_messages

  Inspect captured bidirectional WebSocket connections and frame payloads for the selected page. Use this for WebSocket, socket, live-update, push, streaming, or realtime message flows; use list_network_requests for ordinary HTTP/XHR/fetch traffic and WebSocket upgrade request headers. WebSocket captu

• list_breakpoints

  Inspects code and XHR/Fetch breakpoints managed by this MCP session before reproducing an action or cleaning up debugger state. Returns current code breakpointIds and the exact XHR URL patterns needed by remove_breakpoint; URL-backed definitions are restored after navigation when possible, but a reb

• list_console_messages

  Inspects console messages and uncaught page errors captured for the selected page. Use it to diagnose runtime failures, warnings, application logs, or values already emitted by page code; use search_in_sources for source text and list_network_requests for HTTP evidence instead. Without msgid it list

• list_network_requests

  Inspect captured HTTP(S) traffic for the currently selected page. Use this for API calls, request or response headers and bodies, redirects, authentication/session flows, replay or signing inputs, and determining which response created, refreshed, rotated, overwritten, or deleted a cookie. Without r

• list_scripts

  Discovers JavaScript currently loaded in the selected debugger context—the main frame by default, or the frame chosen with select_frame. Use select_frame first for iframe-specific source/debugger work. Includes external, inline, and eval scripts in that context; if you already know a function name,

• navigate_page

  Navigates, reloads, or moves through history in the currently selected page. Use it to reproduce requests, trigger configured breakpoints, refresh scripts, or continue a workflow in the same tab; use new_page when a separate tab is required. It does not clear cookies, storage, cache, or site data, s

• new_page

  Opens a separate browser page for a URL, reusing an existing about:blank startup tab when available. Use this when the task needs another tab or should preserve the currently selected page; use navigate_page to change the URL in the existing selected page instead. It waits for DOMContentLoaded, not

• pause_or_resume

  Explicitly requests an immediate pause or resumes an existing paused execution; it never toggles implicitly. Use a code breakpoint or break_on_xhr instead when a specific statement/request should stop, and use get_paused_info before resuming if evidence must be collected. Resuming invalidates curren

• remove_breakpoint

  Removes a known code breakpoint, XHR/Fetch breakpoint, or every MCP-managed breakpoint after explicit confirmation. Use breakpointId from set_breakpoint_on_text/list_breakpoints for remove_code, or reuse the exact URL pattern from break_on_xhr/list_breakpoints for remove_xhr. Removal does not resume

• save_script_source

  Saves one complete JavaScript or WASM source for local inspection when an inline snippet is insufficient, especially for large or minified bundles. Prefer get_script_source for a small known region and search_in_sources to locate text across loaded scripts first. With format=true, destinations using

• search_in_sources

  Finds a known function name, endpoint, string literal, token, or code pattern in JavaScript loaded by the selected debugger context—the main frame by default, or the frame chosen with select_frame. It searches external, inline/eval, and minified sources in that context without executing or pausing t

• select_frame

  Lists or selects frames, including iframes, within the current page. Use it when the target element, page-defined global, script, or execution context may live in an iframe: first list frames, then pass frameIdx before click_element or evaluate_script. Omitting frameIdx lists 20 frames per page with

• select_page

  Lists or selects open browser pages. Use it without pageIdx to identify the active page or choose the correct tab before inspecting network traffic, scripts, frames, or console output; pass pageIdx to make one listed page the shared target for later tools. It does not navigate or create pages: use n

• set_breakpoint_on_text

  Sets a restorable URL-backed breakpoint when distinctive code text is known and its runtime values must be observed. Call it directly when the user already supplies precise text plus any URL/occurrence disambiguation; use search_in_sources/get_script_source first only when the location is unknown or

• step

  Advances JavaScript execution by one debugger operation from an existing pause and returns the next stopped call frame with concise source context. Use after get_paused_info or evaluate_script when control flow still needs tracing; it cannot start from running execution. Each advance invalidates pri

• take_screenshot

  Captures the visual state of the currently selected page. Use it to verify page layout, visible UI state, selector targets, in-page dialogs/modals, or the effect of a navigation/click; it is not a substitute for DOM values, network evidence, or script inspection. By default it returns the visible vi

At a glance

Stars

3k

Forks

393

Language

TypeScript

License

Apache-2.0

Created

Nov 2025

Last update

Sep 3, 2026

Type

MCP Server

Price

Free

Topics

Questions about Js Reverse MCP

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