ToolBox

HAR Offline Network Log Analyzer

Upload browser HAR archive logs to audit REST API responses, trace latency parameters, and inspect cookies securely offline.

Privacy Notice — Session Data Leak RisksStandard browser HAR logs contain complete cookies, active Authorization Bearer keys, credit cards, and form headers. Never upload HAR files to central online parsing web dashboards. This ToolBox Co. page decodes logs 100% inside local browser sandbox memory, keeping server logs secure.

Load browser network HAR archive

Drag and drop file here, browse locally, or click to load a sample archive log instantly.

How to Safely Analyze HAR Log Architectures Offline

A **HAR (HTTP Archive)** file is an XML/JSON standard layout tracking all resource transactions recorded by browser networking engines during a session. Developers export HAR archives to profile performance bottlenecks, debug REST API transactions, or review load waterfalls.

How to Generate HAR Archives in Chrome / Safari

  1. Open the landing page you wish to audit.
  2. Right-click anywhere and choose Inspect, then switch to the Network tab.
  3. Reload the page to start tracking all stylesheet, script, and API fetch triggers.
  4. Click the downward pointing arrow button (Export HAR) or right-click within the list and choose "Save all as HAR with Content".

Why Offline-by-Design Parsing is Essential for Audits

Standard network exports contain extensive customer login strings, API keys, session cookie headers, and sensitive JSON payload dumps. Uploading these files to remote centralized servers exposes your organization to severe security leaks.

  • Zero Server Access: This tool utilizes native JavaScript JSON.parse engines locally, ensuring network logs never leave your device.
  • Isolate API Failures: Sort by error status badges instantly to identify broken REST calls and server 500 error pages.
  • Trace Payload Latencies: Audit timing arrays with visual waterfall bars to flag blocking stylesheets or bloated script packages.