What formats can I convert between?

You can convert between JSON, YAML, XML, TOML, and CSV in any direction. The tool supports bidirectional conversion with real-time validation for all format combinations.

Why does my nested JSON lose structure when converting to CSV?

CSV is a flat, tabular format designed for simple row-and-column data. When converting nested structures to CSV, the tool automatically flattens them using dot notation (e.g., address.city). For complex nested data, consider using JSON, YAML, or XML instead.

Can I convert YAML comments to other formats?

No, YAML comments cannot be preserved when converting to other formats because JSON, XML, TOML, and CSV do not support comments in their specifications. Comments are automatically stripped during conversion.

What happens to XML attributes during conversion?

XML attributes are converted to object properties with an @ prefix (e.g., @id, @class) when converting to JSON, YAML, or TOML. This preserves the attribute information while maintaining valid syntax in the target format.

Why does TOML conversion fail with null values?

TOML specification does not support null/nil values. If your data contains null values, you must either remove them or replace them with empty strings or default values before converting to TOML.

Can I use this tool for large files?

For best performance, we recommend files under 5MB. Files over 10MB may cause browser slowdowns or crashes. For very large files, consider using command-line tools like yq, jq, xmllint, or dedicated conversion libraries in your programming language.

How does auto-detect work?

The auto-detect feature analyzes your input using format-specific patterns (JSON braces, YAML colons, XML tags, TOML sections, CSV delimiters) and validates against each format specification until it finds a match. It works best with well-formed, valid data.

Can I convert multiple files at once?

Currently, the tool processes one file at a time. For batch conversion of multiple files, consider using command-line tools or scripting with libraries like js-yaml, fast-xml-parser, or papaparse in your own automation workflows.

What character encoding does the tool support?

The tool supports UTF-8 encoding by default, which covers all modern text formats and international characters. If you have files in other encodings (like ISO-8859-1 or Windows-1252), convert them to UTF-8 first for best results.

Home/Tools/Developer/Data Format Converter

Data Format Converter

Convert between JSON, YAML, XML, TOML, and CSV with real-time validation

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No data is sent to any server. All processing happens locally on your device.

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What Is Data Format Conversion

Data format conversion transforms structured data between different serialization formats — JSON, XML, YAML, CSV, TOML, Protocol Buffers, and more. Each format has distinct strengths: JSON is the standard for web APIs, XML dominates enterprise integrations, YAML excels at human-readable configuration, and CSV is universal for tabular data exchange.

Converting between formats is a daily task for developers, data engineers, and system administrators who work with multiple systems, APIs, and tools that expect data in different formats.

Format Comparison

Format	Human-Readable	Comments	Data Types	Best For
JSON	Good	No	String, number, boolean, null, array, object	Web APIs, configuration, NoSQL databases
XML	Moderate	Yes	String (with schemas for typing)	Enterprise integration, SOAP, document markup
YAML	Excellent	Yes	Same as JSON + dates, multiline strings	Configuration files, Kubernetes, CI/CD
CSV	Good (tabular)	No	String only (untyped)	Spreadsheets, data export/import, analytics
TOML	Excellent	Yes	String, integer, float, boolean, datetime	Application configuration (Rust, Python)
INI	Excellent	Yes	String only	Legacy configuration files

Common Use Cases

API integration: Convert between JSON (REST APIs) and XML (SOAP/legacy APIs) when integrating systems that use different formats
Configuration migration: Convert configuration files between formats when migrating between tools (e.g., JSON to YAML for Kubernetes)
Data pipeline processing: Transform data between formats at different stages of ETL (Extract, Transform, Load) pipelines
Database import/export: Convert CSV exports from databases to JSON for API consumption or YAML for configuration
Documentation: Convert structured data to human-readable formats for documentation and reporting

Best Practices

Preserve data types during conversion — JSON distinguishes strings, numbers, and booleans. CSV treats everything as strings. When converting from CSV to JSON, explicitly parse numeric and boolean values.
Handle encoding correctly — JSON requires UTF-8. XML supports multiple encodings via declaration. Ensure character encoding is preserved during conversion, especially for non-ASCII characters.
Validate after conversion — Always validate the output against the target format's schema or expected structure. Conversion tools may handle edge cases differently.
Be aware of format limitations — CSV cannot represent nested data. XML requires single root elements. YAML is indentation-sensitive. Understand target format constraints before converting.
Use streaming for large files — For files larger than available memory, use streaming parsers (SAX for XML, streaming JSON parsers) rather than loading the entire file into memory.

Frequently Asked Questions

Common questions about the Data Format Converter

All conversions happen entirely in your browser using client-side JavaScript. No data is sent to our servers or stored anywhere. Your files are processed in memory and discarded immediately after conversion.

ℹ️ Disclaimer

This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to or stored on our servers. While we strive for accuracy, we make no warranties about the completeness or reliability of results. Use at your own discretion.