Frontend Frameworks

fast-xml-parser

Efficient XML parsing and validation library.

Status
Generally available
Last checked
Checked · Oct 16, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

Fast-XML-Parser is a high-performance JavaScript library for validating and parsing XML documents. It offers fast processing speeds and supports both synchronous and asynchronous operations, making it ideal for applications that require efficient handling of XML data.

Fast-XML-Parser stands out with its high-performance parsing capabilities and support for both synchronous and asynchronous operations, making it a robust choice for developers needing efficient XML handling.

When it fits — and when it doesn’t

A good fit for

  • Developers working with XML data who need fast and efficient parsing capabilities

  • Projects that require both synchronous and asynchronous XML handling

  • Applications needing flexible configuration options for custom parser behavior

Look elsewhere if

  • Scenarios where XML is not the primary data format being used

  • Real-time streaming applications requiring constant XML updates

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited error handling and diagnostics

    The library provides minimal feedback on parsing errors, making debugging difficult.

  2. 02

    Poor documentation for advanced features

    Advanced configuration options and custom parsers are not well-documented, leading to a steep learning curve.

  3. 03

    Performance degradation with complex XML structures

    The parser's performance significantly drops when dealing with deeply nested or large XML files.

What it does well

  • High-performance XML parsing and validation

  • Supports both synchronous and asynchronous operations

  • Flexible configuration options for customizing the parser behavior

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up fast-xml-parser

Setup steps, common gotchas and what to check after 30 days.

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