You can add Happo visual tests to a Vue project without a Vue-specific Happo plugin. Use Happo with Storybook to compare isolated component states, or connect it to the Cypress or Playwright tests you already use for whole-page and user-flow coverage. Choose the route that matches what you want to protect, then configure Happo and run it in CI.
Choose a visual testing route
Happo’s documented integrations include Storybook, Cypress, Playwright, and a generic API; the reviewed materials do not document a dedicated Vue adapter. The right integration depends on whether you want to test components in isolation or capture states in a running application.
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| Route | Best fit | What to plan for |
|---|---|---|
| Storybook | Reusable Vue components and deliberately chosen states, such as loading, error, or expanded. | Create and maintain stories; configure the preview app with the global Vue setup the components need. |
| Cypress | Application pages and user journeys covered by existing Cypress tests. | Use Happo’s current Cypress integration instructions for runner-specific configuration. |
| Playwright | Application pages and flows covered by existing Playwright tests. | Use Happo’s current Playwright integration instructions for runner-specific configuration. |
| Happo API | A custom capture workflow that does not fit the documented integrations. | Implement authentication and capture submission using the API documentation. |
Happo describes screenshots across browsers and viewport sizes, but browser availability depends on the account plan. Check the current pricing details before designing a required browser matrix.
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1. Pick representative states
For component-level coverage, start with a small Storybook set for components where visual regressions matter. Include meaningful states—not every possible prop combination. A button might need default, disabled, and loading stories; a data panel might need populated, empty, and error states.
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For full pages or user journeys, use the Cypress or Playwright suite already maintained by the project when practical. This reuses existing routes, fixtures, and setup instead of duplicating application navigation in a separate visual test.
2. Install the current package
The current Happo repository documents installing happo as a development dependency. Use the package manager used by the project:
npm install --save-dev happopnpm add --save-dev happoyarn add --dev happo
The repository’s basic example uses a happo.config.ts file, defineConfig imported from happo, API credentials supplied through environment variables, browser targets, and the npx happo command. Because runner-specific configuration can change, follow the live instructions for your chosen integration rather than copying unverified configuration keys. See the current Happo repository.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall3. Connect Storybook to Vue’s application setup
With Vue 3 and Vite, Storybook creates a Vue app for component previews. If your components rely on global plugins, components, directives, or mixins, register the same required setup in Storybook’s preview app using its setup hook. Otherwise, a story may render differently from the application or fail because dependencies available in production were never installed in the preview.
Keep story data and state deterministic: use fixed fixture data, avoid time-dependent content, and ensure the state shown is intentional. Happo’s Storybook integration instructions are the source for the current connection steps.
4. Connect Cypress or Playwright when testing app flows
If the target is a full page or a journey—such as opening a menu, submitting a form, and viewing a confirmation—use the corresponding Happo integration for the runner already in the project. Let the existing test establish the application state, then capture that state through the supported integration. Do not assume Storybook setup or configuration applies to Cypress or Playwright.
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For a custom integration, Happo’s API documentation describes JWT and HTTP Basic authentication. The documentation characterizes Basic authentication as the simpler, less secure option. Keep credentials in environment variables or a secrets manager, never in committed source files.
5. Run visual checks in CI and review changes
Run the visual suite on the changes or pull requests where regressions should be caught, and review Happo’s before-and-after output. A detected difference is a prompt for review, not automatically a defect: intentional UI changes may need their new appearance accepted as the expected result. Happo’s integration materials describe CI and pull-request review workflows.
Reduce avoidable screenshot noise
Happo documents options to silence animations, wait for fonts and asynchronous assets, and apply color-delta tolerance. These can reduce incidental differences, but they do not make a test deterministic by themselves.
- Capture stable states with fixed inputs and data.
- Wait for the UI and assets your test actually depends on.
- Use tolerance deliberately; too much can hide small but meaningful regressions.
- Review changed output instead of treating every pixel difference as a failure requiring automatic acceptance.
Common setup problems
Story renders differently from the Vue app
Check whether the component depends on a global plugin, directive, component, mixin, or application-level provider that Storybook has not registered. Configure the preview Vue app with the required setup.
Happo cannot authenticate
Confirm the credentials are present in the environment used by the local command or CI job, and that they are supplied in the manner required by the current Happo configuration. Do not solve the issue by committing a secret to the repository.
Visual output changes between runs
Look for animations, fonts or asynchronous assets that are not ready at capture time, and non-fixed test data. Use Happo’s documented noise controls where appropriate, then stabilize the state being captured. Tolerance can help with small rendering differences, but it is not a substitute for stable inputs.
A browser target is unavailable
Check the account’s current plan entitlements. Happo’s pricing information says included browsers vary by plan, so do not assume a browser listed in integration materials is available on every plan.
A copied configuration option does not work
Runner settings may differ between Storybook, Cypress, Playwright, and the API, and configuration can change. Use the current instructions for the exact integration and package version rather than borrowing keys from another runner or an older example.
Or skip the browser setup
If you need a screenshot endpoint rather than a visual-regression review workflow, ScreenshotNeo is a website screenshot API and MCP server. It is not a replacement for Happo’s component comparison workflow, but it can capture a URL with one GET request:
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Frequently Asked Questions
Does Happo have a Vue-specific plugin?
The reviewed Happo materials document Storybook, Cypress, Playwright, and API integrations, but not a dedicated Vue adapter.
Should I use Storybook or Cypress/Playwright for Vue visual tests?
Use Storybook for isolated component states and a test-runner integration for full pages or user journeys; the choice depends on what you need to cover.
Quick Recap
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