HTML ERB Formatter

Formats HTML with embedded Ruby (ERB) templates to produce clean, consistent, and nicely indented code for web developers and template authors.

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1,688+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how HTML ERB Formatter processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

Formats HTML with embedded Ruby (ERB) templates into clean, consistently indented code suitable for Rails views and partials.
It conceptually separates ERB regions from HTML, applies indentation rules uniformly, and preserves Ruby expressions, ensuring code semantics remain intact while readability improves. The tool handles nested ERB blocks and HTML elements, normalizing spaces and line breaks to a configurable style. Practically, developers, front-end engineers, and template authors gain predictable output across files and projects, reducing diffs during code reviews and speeding up hand-offs. Unique value lies in its focus on ERB-aware formatting rather than generic HTML formatting, which prevents inadvertent changes to Ruby logic within templates. Core features include configurable indent size, line length constraints, ERB delimiter preservation, and batch processing capabilities for multi-file templates. Use cases include Rails view templates, partials, email templates, and any ERB-based front-end markup that must maintain consistent style across a team.

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How to Use

Provide inputs: paste the HTML+ERB source into the input field and set options (indent_size, max_line_length, preserve_erb).
Choose formatting scope: single file or batch processing for multiple templates.
Run formatting: apply the formatter to generate formatted_code.
Review outputs: copy, export, or commit the formatted code to the repository.

Frequently Asked Questions

Find Quick Answers

What formats does the tool support?

The tool formats HTML templates that contain embedded Ruby ERB tags. It preserves ERB syntax such as <%= %>, <% %>, and <%- %> while applying HTML indentation and whitespace normalization. It does not parse or execute Ruby code.

Does it preserve ERB Ruby code and syntax?

Yes. The formatter treats ERB blocks as code regions and keeps Ruby expressions intact. It formats surrounding HTML consistently and maintains the position and boundaries of ERB delimiters to avoid semantic changes.

Can it handle large templates?

The tool supports large templates by processing input in a streaming or batched manner. It reports changes efficiently and avoids excessive memory usage, though extremely large single files may require chunked processing or batch runs.

Is it Rails-specific?

It is tailored to HTML ERB used in Rails views, including common patterns like partials and nested templates. It remains general for ERB in HTML, but its optimization targets Rails-style conventions and file naming.

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