Use Storybook as the source of isolated component states, then configure Happo’s Storybook integration to capture those stories and compare them with a baseline. Run the visual checks in CI so pull requests can show reviewable differences. This workflow applies to a Next.js project that already has Storybook; Happo’s published setup material does not establish a separate Next.js plugin or a tested Next.js–Storybook–Happo version matrix.
How Happo fits into a Next.js and Storybook project
Next.js supplies the application and components; Storybook renders selected components independently of the full application. Happo captures those Storybook stories and compares the resulting images with a baseline. The check answers whether a rendered appearance changed, not whether a button or form still behaves correctly. Keep functional assertions and Storybook interaction tests for behavior, and use Happo for visual regression review. Happo’s Storybook overview describes this distinction and its workflow.
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Happo’s integration article identifies the happo.io and happo-plugin-storybook packages as setup components, but it was updated September 18, 2025 and does not provide a current compatibility matrix. Follow Happo’s Storybook integration article and its linked current setup instructions for exact install commands and configuration. Do not infer a required Next.js export mode, package version, or dedicated Next.js plugin from the available guidance.
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1. Make sure the important UI states are stories
Start with the Storybook already used by the project. Add stories for the components and visual variants that matter: for example, default, disabled, validation-error, loading, and empty states. A page that exists only inside a fully assembled Next.js route is not automatically covered; Happo’s Storybook integration captures stories, so represent the component state you want to review there.
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For states that require interaction, use Storybook interaction tests to reach the target state before capture. A menu can be opened, a field can be filled to trigger validation, or a control can be hovered. Happo documents this approach for transient states such as loading, error, hover, and open menus. Keep interaction assertions: producing the right screenshot does not by itself prove that the interaction is correct.
2. Configure Happo’s Storybook integration
Install and configure the Happo plugin using the current instructions linked from Happo’s integration documentation. The package names in Happo’s 2024 article, updated in 2025, are useful orientation rather than a guarantee that they are the latest versions. Since exact current commands, scripts, and configuration syntax are not established here, avoid copying version-sensitive setup from an unrelated example; use the instructions for your installed Storybook and Happo releases.
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3. Pick browser and viewport coverage deliberately
Happo’s Storybook offering lists Chrome, Firefox, Safari, Edge, and iOS Safari, and supports responsive viewport sizes. Choose targets based on the browsers your users need and the layouts most likely to break. A compact matrix can catch different classes of problems without multiplying every story across every possible combination:
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- Include the desktop browsers your product supports.
- Include a narrow viewport for components whose layout changes at mobile breakpoints.
- Add further browser or viewport combinations where platform differences or risk justify the extra coverage.
One viewport is not proof that a responsive component works at every breakpoint. Select representative widths around meaningful layout changes rather than relying on a single default.
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4. Run captures in CI and review the pull request
Happo describes CI integration that gives pull requests visual feedback and review links. Add the run to the project’s CI pipeline using Happo’s current provider-specific instructions, then review the generated comparisons before merging. Happo offers side-by-side, diff-highlight, and swipe views; these help reviewers distinguish intended changes from regressions. Its Storybook page also describes color-delta tolerance and measures intended to silence animations and wait for fonts and asynchronous assets.
Do not assume every CI provider is supported in the same way. Happo’s September 10, 2026 GitLab announcement described GitLab support as experimental at publication, so verify its status and current setup instructions before depending on it: Happo’s GitLab announcement.
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Keep visual runs useful without hiding regressions
Limit partial runs to changes you can safely map
Happo’s --only feature can restrict a run to story files selected by your own dependency analysis. That can reduce work, but the selection logic is a project responsibility: dynamic imports, shared components, and implicit dependencies can make static analysis miss affected stories. Use full runs when the impact is global or uncertain, including changes to package files or Storybook configuration, and validate your affected-story selection against full runs before relying on it.
Happo reported that wiring --only into its own Storybook build reduced its snapshot volume by 40%; that is Happo’s internal result, not a forecast for another repository. The same article gives one report with 66 snapshots generated for a full report of 7,315 snapshots, an example rather than a general ratio. Details: Happo’s coverage and snapshot-volume article.
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Control external requests when they make captures unpredictable
Third-party fonts, images, widgets, and other network resources can change independently of your code or fail during a capture. Happo’s September 23, 2026 article documents per-target allowedHostnames to restrict snapshot network requests and recommends restrictive settings when appropriate. It said the option was off by default at publication and described a future major-version change; check the current default before configuring it, and allow the hosts your stories genuinely need. A restriction that blocks a required font or image can create misleading visual diffs.
Happo reported one customer’s flaky variants falling from about 2,000 to about 20 after rollout of this control. That is a customer result reported by Happo, not a typical outcome or a guarantee. The feature and caveats are described in Happo’s HTTP request controls article.
Troubleshoot common visual-test problems
- No stories appear in the report: confirm the Happo plugin is configured for the Storybook used by the project, that the intended stories are included, and that the CI job invokes the configured capture run. Check the current Happo setup instructions rather than assuming a Next.js-specific command.
- A transient state is missing: create or update a story and use its interaction test to reach the state before capture. A screenshot run will not discover an open menu or validation message that no story renders.
- Diffs change between runs: look for animation, fonts, asynchronously loaded assets, and external network requests. Use Happo’s documented settling and color-delta controls, and consider limiting allowed network hostnames after verifying required resources.
- A partial run misses a changed component: treat dependency selection as suspect, especially for shared packages, configuration, dynamic loading, or implicit dependencies. Run the full suite for global or uncertain changes and improve the selection logic before restoring partial coverage.
- The CI integration does not behave as expected: verify the provider’s current support status and its instructions. GitLab was described as experimental in Happo’s September 2026 announcement, so do not rely on that historical status as confirmation of current behavior.
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