HAR File Analyzer & Waterfall
HAR File Analyzer & Waterfall: Parses HAR JSON log entries, computes request duration, DNS, TLS, and TTFB breakdown, and flags slow requests.
About this har file analyzer & waterfall
HAR File Analyzer & Waterfall — browser-based utility.
How this tool works
Implements client-side HAR File Analyzer & Waterfall operations. Parses HAR JSON log entries, computes request duration, DNS, TLS, and TTFB breakdown, and flags slow requests specifically designed for a performance engineer inspects an exported http archive (.har) to identify slow api request waterfalls.
- cURL Command Tokenization: Tokenizes shell commands, handling quoted strings, multiline backslashes, headers, and multipart form payloads.
- Protocol Semantic Parsing: Maps flags to HTTP method, target URL, query parameters, authorization credentials, and body data.
- Client Code Synthesis: Synthesizes idiomatic programming language constructs with correct asynchronous syntax and error handling.
- Security & Header Diagnostic: Checks for dangerous header combinations such as CORS wildcard '*' alongside credentialed requests.
Worked example
Scenario: A performance engineer inspects an exported HTTP Archive (.har) to identify slow API request waterfalls.
Sample input:
Processing: Parses HAR JSON log entries, computes request duration, DNS, TLS, and TTFB breakdown, and flags slow requests.
Illustrative output:
Limits and verification
Handles escaped quotes inside body strings correctly. Flags invalid HTTP methods and unsupported command-line arguments. Does not execute live HTTP requests against external endpoints from this browser session.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the HAR File Analyzer & Waterfall workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
What does HAR Analyzer calculate?+
It parses JSON and reads log.entries. For every entry it counts the response status, adds response.bodySize with JavaScript number conversion, sums time, and rounds the average time in milliseconds to the nearest integer.
What did the HAR fixture verify?+
A three-entry HAR with body sizes 20, 10 and 0, times 100, 201 and 0, and statuses 200, 404 and 200 produced 3 entries, 30 total body bytes, 100 average milliseconds, and status counts of 200: 2 and 404: 1.
What HAR details are omitted?+
The summary does not build a waterfall, inspect request URLs, timings phases, compressed transfer size, MIME data, cache state, redirects, HAR version validity, or negative and nonnumeric values beyond the implementation conversion.
Can this summary diagnose network performance alone?+
No. It only aggregates fields present in the submitted HAR text. Browser capture conditions, missing entries, clock origin, server behavior, and the cause of a slow request require separate evidence.