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Compare HAR files.

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// repository documentation

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# Compare HAR files
Make it easier to find regressions by comparing your [HAR](http://www.softwareishard.com/blog/har-12-spec/) files. Test it out https://compare.sitespeed.io.

![Logo](https://raw.githubusercontent.com/sitespeedio/compare/main/img/compare.png)

## First: Shout out!
We couldn't have built compare without the support or inspiration from the following people:
 * Thank you [Patrick Meenan](https://twitter.com/patmeenan) :bow:. The waterfall is rendered with Pat's [waterfall-tools](https://github.com/pmeenan/waterfall-tools), and the WebPageTest HAR compare viewer is what inspired the blend slider.
 * Thank you [Michael Mrowetz](https://twitter.com/MicMro) :bow:. Earlier versions of compare used Michael's [PerfCascade](https://github.com/micmro/PerfCascade) and it carried us for years.

If you like our project, please give them also some extra love :)

## Comparing
![Compare two different HAR files](https://raw.githubusercontent.com/sitespeedio/compare/main/docs/img/compare.png)

## How it works
As long as your HAR files follow the [HAR specification](http://www.softwareishard.com/blog/har-12-spec/) you can use them in compare. Standard HARs give you the basics; HARs from WebPageTest and sitespeed.io/Browsertime unlock the extras.

The result page is the same for every HAR — sections that don't apply silently stay hidden, so a plain Chrome HAR doesn't show a half-empty "filmstrip" or "CPU" block.

### What you get for every HAR
* A **stacked waterfall** rendered by [waterfall-tools](https://github.com/pmeenan/waterfall-tools). Both HARs share the same time axis so widths are comparable at a glance. A **blend slider** fades HAR2 over HAR1, and a per-result toggle switches between **side-by-side** and **overlay**. Hovering a request highlights its peer in the other waterfall.
* A **Page X-ray** table (powered by [PageXray](https://github.com/sitespeedio/pagexray)) grouped into sections — Content, Render blocking, Visual metrics, Core Web Vitals, CPU and First/Third party. A **Δ column** shows the HAR2−HAR1 delta with regressions in red and improvements in green. An **"Only differences"** toggle hides rows where the two HARs match.
* A **request/response diff** when both HARs are for the same URL — added requests, removed requests, and (per-request) size, status and timing changes. Tick **"Strip version parameters"** on the start page (or set `"stripVersion": true` in your config) to ignore cache-busting query strings.
* A **domains** breakdown.
* Chrome HARs with priority hints also produce a **Render blocking** row (blocking / potentially blocking / in-body parser blocking).
* `.har` and `.har.gz` are both accepted on drag/drop and via URL.

### Extras for WebPageTest HARs
SpeedIndex, FirstVisualChange and, if the run was captured on Chrome with the CPU profile enabled, CPU timings.

### Extras for sitespeed.io / Browsertime HARs
* **Visual progress chart** with a line per HAR and vertical timing markers (First Visual Change, FCP, LCP and Speed Index) so a regressed metric shows up as two side-by-side guide lines.
* A **filmstrip** section sampled from the VisualProgress change points, with a lightbox for full-size frames, plus a small thumbnail strip under the visual-progress chart.
* The full set of visual metrics (FirstVisualChange, LargestImage, Logo, Heading, Speed Index, LastVisualChange, Visual Readiness).
* **Core Web Vitals**: First Contentful Paint, Largest Contentful Paint, Total Blocking Time, Cumulative Layout Shift.
* CPU details when sitespeed.io ran Lighthouse: Long Tasks, Total Blocking Time, Max Potential FID.

If you deploy your sitespeed.io result with **--resultBaseURL**, compare will pick up the screenshot, video and a link to the result page.

PageXray auto-detects first-party hosts from the page URL. If you want to override it (e.g. multi-domain sites), pass a regex via **--firstParty** when running sitespeed.io, or set `"firstParty"` in the config below; the result page then shows a first-vs-third party breakdown.

![First Party vs Third Party!](https://raw.githubusercontent.com/sitespeedio/compare/main/docs/img/firstparty.png)

## How to use it
You can either upload two HAR files (drag/drop) or give the URL to two URLs hosted online. If your HAR got multiple pages/runs, you can use just one HAR file.

Or you can just copy/paste your HAR file into the start page of [compare.sitespeed.io](https://compare.sitespeed.io/).

If you host your sitespeed.io result pages, you can copy/paste the URL to a page or to a specific run and Compare will automagically find the URL to the HAR file.

### Configuration
You can use a configuration JSON to choose which HAR files that will be tested. The minimal configuration needed:

```json
{
  "har1": {
    "url": "https://www.url.com/page1.har"
  },
  "har2": {
    "url": "https://www.url.com/page2.har"
  }
}
```

But you can also add some extra sugar. All the extras are optional:
```json
{
  "har1": {
    "url": "https://www.url.com/page1.har",
    "label": "Before change",
    "run": 1
  },
  "har2": {
    "url": "https://www.url.com/page2.har",
    "label": "After change",
    "run": 2
  },
  "title": "The page title used in the title bar",
  "firstParty" : " (.*wikipedia.*||.*wikimedia.*)", // RegEx that defines first party requests
  "stripVersion": true, // ignore query-string version params when diffing requests
  "comments": {
    "intro": "Extra information put at the top of the page",
    "waterfall": "Text displayed at top of the waterfall",
    "visualProgress": "Text displayed at the top of visual progress",
    "domains": "Text displayed at the top of domains",
    "requestDiff": "Text displayed at the top of request/response diff",
    "firstParty": "Text displayed at the top of first/third party"
  }
}
```

And then you can use your configuration file in different ways. You can copy/paste the configuration into the start page of [compare.sitespeed.io](https://compare.sitespeed.io).

Or you can use it like this: https://compare.sitespeed.io/?config=https://URL_TO_THE_CONFIG_FILE

Make sure that your server has correct [CORS settings](https://en.wikipedia.org/wiki/Cross-origin_resource_sharing) so that compare.sitespeed.io can get the HAR file.

### Github gist
You can also use host your configuration file on a [Github gist](https://gist.github.com/) and use the gist id https://compare.sitespeed.io?gist=GIST_ID to get the configuration file.

You can checkout out our example:
[https://gist.github.com/soulgalore/94e4d997a78e03b32b939fcea63eae8e](https://gist.github.com/soulgalore/94e4d997a78e03b32b939fcea63eae8e)

You can also copy/paste gist id (or the full URL to the gist) into [compare.sitespeed.io](https://compare.sitespeed.io).

Thank you [Matt Hobbs](https://github.com/Nooshu) for sharing the gist idea!

### Compare on the fly
You can also compare two HAR files on the fly without using a configuration file.

Add the parameters **?har1=FULL_URL1&har2=FULL_URL2&compare=1** and the two HAR files will be compared.

## Developers

The project is built with [Vite](https://vitejs.dev/). Compare uses a small Vite-bundled entry (`src/main.js`, which pulls in the CSS and the waterfall-tools wrapper) plus a set of classic-script modules in `public/js/compare/` that share globals on `window`. Vite serves `public/` verbatim in both dev and production, so editing a file under `public/js/compare/` is a hard reload away from running.

Run the dev server:
```
npm run develop
```

Send us a PR / create an issue. If you have a big change coming up, please discuss it with us in an issue first.

## Deploy your own version
Deploying your own version is easy:
1. Clone the repo: `git clone git@github.com:sitespeedio/compare.git`
2. Build: `cd compare && npm install && npm run build`
3. Copy everything in `dist/` to your server.

The build version-stamps the classic compare scripts so a new deploy invalidates any stale copies cached by visitors.

## Privacy
We take your privacy really serious: We do not use any tracking software at all (no Google Analytics or any other tracking software) in [compare.sitespeed.io](https://compare.sitespeed.io). The page do no call home.

And you can deploy your own version of [compare.sitespeed.io](https://compare.sitespeed.io) if you want to be 100% in control.

### Be kind
If you deploy your own version: please keep the original logo and the link to the project. We have spent a lot of our free time to work on this!

## The logo
The compare logo (and the rest of the sitespeed.io logos) are made by [Mochamad Arief](https://twitter.com/mochawalk),
you can find his stuff at http://www.mochawalk.com/.

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