🏷️ Tech Topics:#HAR#HARViewer#NetworkWaterfall#ChromeDevTools#HTTPPerformance#APIDebugging#SensitiveHeaders#ZeroUpload
📖

Private HAR File Analyzer Guide

Inspect a HAR export from Chrome DevTools without uploading network logs. The analyzer summarizes requests, HTTP failures, slow calls, domains, transfer size, and potentially sensitive header names locally in your browser.

✨ Key Capabilities

  • •Reads .har and JSON HAR 1.2 files only in browser memory.
  • •Builds a request-duration waterfall and filters errors, slow calls, and sensitive headers.
  • •Summarizes domains, transfer size, response status, and request methods.
  • •Flags header names such as Authorization, Cookie, Set-Cookie, and X-API-Key without showing their values.

🚀 How to Use

  1. 1In Chrome DevTools Network, export the session as a HAR file.
  2. 2Drop the .har file onto this page or click to choose it.
  3. 3Review summary cards and Findings, then filter the waterfall to focus on a problem.
  4. 4Clear the file when finished; it was never uploaded or retained by this tool.
🔒100% Client-Side Privacy Guarantee

The FileReader API reads the selected local file into browser memory and JavaScript parses the HAR log.entries array. No fetch request, server API, telemetry, or storage is used. Sensitive-header detection checks header names only, never displays header values.

💡Technical Deep-Dive & Detailed FAQ Guide

3 questions & detailed answers

Q1.Is my HAR file uploaded?

No. The file is read and analyzed entirely in the current browser tab.

Q2.Does it reveal Authorization or Cookie values?

No. The analyzer flags only sensitive header names so secrets remain out of the interface.

Q3.What counts as a slow request?

Requests lasting one second or longer are flagged as slow.