HAR File Viewer & Analyzer
Inspect, analyze, and troubleshoot HTTP Archive (HAR) network logs online. Visualize waterfall timings, headers, cookies, and JSON payloads with 100% client-side privacy.
Drop your .har file here
How HAR File Viewer & Analyzer Works & Technical Principles
Inspect, filter, and audit HTTP Archive (HAR) network session recordings directly in your browser. All log parsing executes locally to protect confidential tokens and payloads.
Technical Overview: HTTP Archive (HAR) Waterfall & Performance Auditing
A HAR (HTTP Archive) file is an open JSON-based specification that captures complete browser network telemetry, including DNS lookups, TLS handshakes, request headers, cookies, timing breakdowns, and response payloads recorded during web interactions.
Input & Configuration
Drag and drop or browse to upload an exported .har file from Chrome, Firefox, Safari, or Edge DevTools.
Client-Side Processing
The browser parses the JSON log structure, calculates request timings (blocked, DNS, connect, send, wait, receive), and formats headers.
Instant Output & Export
Explore the interactive waterfall timeline, filter by content type (XHR, JS, CSS, Img), and inspect detailed request payloads.
Key Capabilities & Features
Comprehensive Waterfall Timeline
Visually audit time-to-first-byte (TTFB), content download durations, DNS delays, and connection latency.
Payload & Header Inspection
Inspect request and response headers, query parameters, POST data, cookies, and raw JSON response bodies.
100% In-Browser Privacy Guarantee
Large multi-megabyte HAR files containing sensitive auth cookies and session tokens never leave your computer.
Multifunctional Resource Filtering
Filter network requests by status code (2xx, 4xx, 5xx), resource type, or keyword search across URLs.
Standard JSON format specification for HTTP Archive network log interchange
Specification defining network timing metrics captured in browser telemetry