MJML.ai Use Case
MJML Validator for production-safe email templates
Use this workflow when your template mostly works but you need confidence before sending. Validate tag nesting, layout structure, and output quality so broken markup does not reach subscribers.
Catch structural issues early
Spot invalid nesting, unsupported combinations, and malformed sections before they become delivery-time surprises.
Reduce QA cycles
Validate once in a focused pass instead of discovering errors late in a fragmented render-test loop.
Ship with confidence
Pair validation with compile preview so your final HTML is reliable across major clients.
When to use MJML Validator
- You inherited a template and need a quick safety check before campaign launch.
- You are iterating on modular sections and want to confirm each update remains valid.
- You need a repeatable final pass before handing templates to marketing or lifecycle teams.
Practical checks
Common MJML errors worth catching
Invalid nesting
Components such as mj-column placed outside the mj-section structure they require.
Missing attributes
Buttons, images, or links without the values needed to compile or behave correctly.
Unsupported components
Misspelled tags or components that are unavailable in the selected MJML version.
Risky output
Markup that compiles but still needs desktop, mobile, and inbox-client review.
Example
From validation error to valid structure
Invalid
<mj-body>
<mj-column>...</mj-column>
</mj-body>Valid
<mj-section>
<mj-column>...</mj-column>
</mj-section>Related workflows
Validation catches issues. Repair fixes them. Conversion workflows help migrate old assets.