XML Formatter

A fast XML formatter and validator that outputs well-formatted XML and a validation report for developers, testers, and data engineers.

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2,996+
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 XML 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

XML Formatter and Validator is a developer-oriented tool that ingests raw XML text and returns two artifacts: a consistently formatted XML string and a structured validation report. It focuses on well-formedness checks, namespace correctness, and basic schema awareness, enabling teams to catch syntax problems early before transport or processing. Conceptually, the tool parses XML into a token stream, preserving element order while reassembling a human-readable, indentation-based representation. It detects encoding, handles namespaces, and reports errors with precise line and column information. If a user supplies a target schema (DTD or XSD), the validator can perform schema validation in addition to basic well-formedness. Who benefits: backend services, API developers, data engineers, and QA analysts who integrate XML in messages, payloads, or configuration files. The value is speed, determinism, and consistency: formatting is repeatable, outputs are deterministic for CI pipelines, and error messages help pinpoint problems quickly. Core features and use cases: choose indentation level and minification, switch between compact and readable layouts, validate against a provided schema, and obtain a precise error log with line/column coordinates. Typical use cases include preparing data dumps for testing, validating configuration files, and ensuring documents meet basic XML quality standards.

How to Use

  1. Provide inputs: raw_xml, optional encoding and validate_against.
  2. Choose formatting options: indentation size, minify flag, newline style.
  3. Run processing: perform formatting and optional validation.
  4. Review outputs: formatted_xml, is_well_formed, errors and warnings.
  5. Export results: copy or download the formatted XML and report.
How to use xml formatter and validator

Frequently Asked Questions

Find Quick Answers

What inputs are required?
Required: input_xml string. Optional: encoding, validate_against, indent, minify. Outputs include a formatted_xml string, a boolean is_well_formed, and a structured list of errors and warnings with location data.
Can it validate against DTD or XSD?
Yes, when a schema path is provided via validate_against. The tool can perform well-formedness checks plus validation against the given DTD or XSD and returns detailed error messages with line and column information.
How does it handle large files?
It uses streaming parsing and incremental processing to limit peak memory. For very large inputs, the tool can process in chunks when configured, returning partial yet progressively accurate results and reports.
What outputs are produced?
The primary output is a formatted XML string. Optional minified output may be produced, along with a structured diagnostic report containing errors, warnings, and location data.

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