JSP Formatter

A free online JSP formatter that formats JavaServer Pages code for developers, QA engineers, and code maintainers seeking consistent indentation and readability.

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2,232+

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 JSP 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

JSP Formatter provides automated whitespace and tag formatting for JavaServer Pages source code. It standardizes indentation, aligns attributes, and normalizes line breaks to improve readability in teams and code reviews.
Conceptually, the tool tokenizes JSP content, preserves directives, scriptlets, EL, and JSTL constructs, and reapplies a consistent layout without altering code behavior. It uses a conservative parse to avoid changing logic, focusing solely on formatting.
Target users include backend Java developers, build engineers, QA, and legacy-maintenance teams who need fast, repeatable formatting in CI pipelines or local editors. Its unique value lies in supporting JSP-specific syntax and directives while offering configurable indentation and line-length rules.
Core features include: input of JSP source, optional preferences (indent_size, max_line_length), deterministic formatting, preservation of comments, and output of a clean, ready-to-commit JSP file. Use cases cover code reviews, preparing files for diff-based tasks, and standardizing JSP formatting across projects.

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How to Use

Provide inputs: paste JSP code and set optional preferences such as indent_size and max_line_length.
Run formatting: trigger the formatter to apply JSP-specific layout rules.
Review outputs: inspect the formatted JSP code; ensure no semantic changes.
Validate: perform quick syntax checks and tag balance checks.
Export: copy or download the formatted JSP file for commit.

Frequently Asked Questions

Find Quick Answers

What JSP features are supported?

The formatter supports standard JSP syntax including scriptlets, expressions, directives, and JSTL/EL constructs, while preserving execution semantics and directives.

How are errors handled?

If parsing succeeds, formatting is applied deterministically. On parse failures, best-effort formatting is returned along with diagnostic details about problematic regions.

Can I customize indentation?

Yes. You can set indent_size and enable attribute alignment, with sensible defaults to produce consistent, readable JSP code across files.

Are comments preserved?

Comments are preserved and repositioned only as needed to maintain formatting consistency, ensuring they stay with the relevant code blocks.

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