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How the diff gets from Cypress into the report
There are two separate jobs in this workflow. A visual-diff plugin captures a page, compares it with a saved baseline, and writes a difference image. Mochawesome records test results and context. The report will not automatically discover every PNG in your snapshots directory: connect the jobs by adding the diff path to the test that produced it.
- Run a visual comparison, such as
cypress-image-snapshot‘s image-match command. - Find the diff PNG produced by that run.
- While the relevant test is still active, pass its path to
cy.addTestContext(). - Generate or merge the report, keeping the referenced image available or enabling embedding.
This is distinct from calling cy.screenshot(). A screenshot captures an image; it does not compare that image with a baseline or create a diff. Cypress’s visual-testing guidance also distinguishes capture from comparison and describes hosted visual-testing alternatives.
Set up the direct reporter integration
For Cypress 10 and later, a typical setup registers the Mochawesome reporter plugin in the Cypress configuration and registers both Cypress-side commands in the support file. Confirm that the installed reporter and Cypress versions are compatible: the reporter’s compatibility table changes by major version.
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Configure the reporter
// cypress.config.js
const { defineConfig } = require('cypress');
module.exports = defineConfig({
reporter: 'cypress-mochawesome-reporter',
reporterOptions: {
embeddedScreenshots: true,
inlineAssets: true
},
e2e: {
setupNodeEvents(on, config) {
require('cypress-mochawesome-reporter/plugin')(on);
return config;
}
}
});embeddedScreenshots: true tells the reporter to embed external screenshots into the HTML using base64. inlineAssets: true can be used when you want a single HTML file rather than an HTML report that relies on separate assets. The reporter is described by its README as a zero-configuration Mochawesome reporter for Cypress with screenshots attached to tests; manually adding a diff path is still the key step for this generated image.
Register commands in the support file
// cypress/support/e2e.js
import 'cypress-mochawesome-reporter/register';
import { addMatchImageSnapshotCommand } from 'cypress-image-snapshot/command';
addMatchImageSnapshotCommand();Keep the support-file imports in the file Cypress actually loads for the relevant test type. If your project uses a different support-file path or module format, apply the same registrations there using the syntax your project already uses.
Generate the diff, then attach its path
cypress-image-snapshot compares a new screenshot with a saved baseline and writes the resulting diff under cypress/snapshots/__diff_output__ by default. The exact filename depends on the test and plugin version. Do not assume a remembered filename is correct; confirm the path from the run output or the plugin configuration, especially if the project sets a custom diff directory.
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// In the test, after the image-match command has produced the diff:
cy.addTestContext({
title: 'Image snapshot diff',
value: 'cypress/snapshots/__diff_output__/login.png'
});The filename above is an example of the default directory structure, not a guaranteed output name. Replace it with the actual path for that run. Attach the context after the visual comparison command so the diff has been produced, and before the test’s results are written out. The reporter API takes the title and value in the context object; the value should identify the image file you intend to include.
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A path that works on a developer’s machine can fail in CI if it points into a temporary runner directory or if the file is discarded before report generation. Ensure the artifact is still present in the workspace at the time Mochawesome processes the test context. If the HTML will be opened without its image files, enable embedded screenshots. If it must be distributed as one standalone HTML file, enable inline assets as well.
Use plain Mochawesome when you need a merge pipeline
If the project uses the plain mochawesome reporter instead of cypress-mochawesome-reporter, Cypress’s reporter guidance shows emitting JSON per run and then merging and rendering it. Configure the reporter in the Cypress configuration:
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reporter: 'mochawesome',
reporterOptions: {
reportDir: 'cypress/results',
overwrite: false,
html: false,
json: true
}Run the specs so they produce JSON files, merge those files, then render the HTML:
npx mochawesome-merge cypress/results/*.json -o mochawesome.json
npx marge mochawesome.jsonThe test context containing the diff reference needs to be in the JSON before the merge and render steps. If the context is absent from the per-spec results, the merged HTML cannot recover the reference merely because the PNG exists in the workspace. When specs run separately, overwrite: false preserves each run’s JSON for the merge rather than replacing earlier output.
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Choose the report workflow that matches your CI
| Approach | Attachment and report behavior | Good fit | Trade-off to plan for |
|---|---|---|---|
cypress-mochawesome-reporter |
Attach test context with cy.addTestContext(); reporter options support embedding screenshots and inlining assets. |
Projects that want Cypress screenshots and manually attached context in a direct reporter workflow. | Diff output paths still need to be valid at report-generation time, and reporter compatibility depends on installed versions. |
| Plain Mochawesome plus merge and render | Write per-run JSON, merge it with mochawesome-merge, then render with marge. |
CI jobs that produce separate results for specs and need an explicit merge stage. | Context must survive in the JSON inputs, and referenced images must be retained or embedded for later viewing. |
| Hosted visual testing | Hosted integrations can centralize screenshot and diff review. | Teams that want centralized review rather than only locally generated report artifacts. | This changes retention, access, and cost characteristics; confirm those terms for the service selected. |
The first choice is usually the shortest path when the report itself is the destination. A JSON merge pipeline is useful when independently run specs must become one report. Hosted review is a separate operating model, not just another way to attach a local PNG; decide based on where results need to live and who must be able to access them.
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Troubleshoot a diff that is missing from Mochawesome
The diff PNG was never created
Check the visual-diff command’s run output and look in the configured diff directory. The default for cypress-image-snapshot is a sibling __diff_output__ directory under cypress/snapshots; a custom customDiffDir changes that location. If no file exists, solve the comparison or plugin setup first. Adding a context entry cannot create a diff image.
The report shows a broken image or no image
- Check that the context value points to the actual generated file, not a guessed test-name filename.
- Check that the path resolves in the CI workspace during report generation and remains available with the published artifact.
- Enable
embeddedScreenshots: truewhen readers will not have the original image files beside the report. - For a single standalone HTML artifact, use
inlineAssets: trueas well.
The diff exists but the merged report omits it
Inspect the per-spec JSON before merging. The context attachment must already be present there; then run mochawesome-merge and marge. In a multi-spec job, preserve the JSON outputs from each run instead of overwriting them, and do not remove image files before the final report is created.
The capture appears, but there is no comparison image
cy.screenshot() alone is not a visual-diff operation. Register and run a comparison command such as the one provided by cypress-image-snapshot, then attach the generated diff. If the comparison is configured to write to a custom directory, use that directory when locating the file.
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The setup fails after a dependency upgrade
Check the reporter’s published compatibility table against the Cypress and Node versions installed in the project. Compatibility varies by reporter major version, so do not infer that a setup working with one major release will work unchanged after an upgrade. Re-run one representative spec and verify the diff, context in the result, and final HTML as separate checkpoints.
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The described documentation does not establish a universal runtime cost, reliability percentage, or storage duration for this workflow, so those figures should not be assumed. Operationally, the report is only as portable as its referenced assets: embedding reduces dependence on a neighboring image directory but makes the HTML carry base64 image data; keeping external images separate avoids that embedding but requires the files to travel with the report. In CI, retain the diff files through the merge/render stage and publish them with the report unless they have been embedded.
For a stable pipeline, treat comparison output, test context, JSON merge, HTML render, and artifact publishing as distinct steps. A failure at any link can make the image unavailable even when Cypress itself completed the test. Validate the final published artifact, not only a report opened inside the original runner workspace.
When an API screenshot is useful instead
ScreenshotNeo is a screenshot API and MCP server, not a Cypress visual-diff engine or a Mochawesome attachment mechanism. It can be useful when your need is to obtain a website screenshot without setting up a browser capture in your own code; it does not replace the Cypress comparison-and-context steps above when the requirement is a diff image inside a test report.
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For a standalone website capture, one GET request returns an image or PDF. The example below saves a WebP screenshot of Stripe; see the ScreenshotNeo API documentation for request options.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie or consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; those steps can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and each response says which outcome occurred in X-Page-Verdict and X-Billed headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents and MCP clients.
The free plan includes 1,000 shots per month with no card. Paid plans start at $5 for 3,000 shots; every feature is on every plan. ScreenshotNeo is made by Yorker Media. Learn more at ScreenshotNeo, or sign up free for 1,000 screenshots a month with no card.
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