Universal Data Converter

Free Online Tool - All Formats Bidirectional Support

Universal Data Converter is an integrated free online tool for converting between major data formats including JSON, CSV, TSV, XML, YAML, TOML, INI, ENV, and Properties. Complete conversion tasks that previously required separate tools in one place, dramatically improving developer productivity for API development, data migration, and configuration file management. Your input data is never stored on our servers, so even confidential information can be converted safely.

How to Use

Using Universal Data Converter is very simple:

Step 1: Select Input and Output Formats
Select the source format (input format) and target format (output format) from the dropdowns. Supports 9 formats: JSON, CSV, TSV, XML, YAML, TOML, INI, ENV, and Properties.
Step 2: Enter Data
Enter the data you want to convert in the text box below. Supports nested structures and complex data formats.
Step 3: Click Convert Button
Click the "Convert" button to instantly convert your input data to the selected format. Copy the result for use. If there are errors, detailed error messages will be displayed.

Your input data is never stored on our servers. All processing is completed in your browser, and your privacy is completely protected.

Data Conversion Tool

Input Format

Output Format

Conversion Options

CSV Delimiter

CSV Header Row

XML Root Element Name

JSON Output Format

Enter data to convert

Conversion Result

Practical Use Cases for Universal Data Converter

Examples of conversions useful in various development scenarios:

1. API Development & Testing

Convert JSON responses to CSV for Excel analysis, or convert API specs defined in YAML to JSON for testing tools. Streamlines REST API development and debugging.

2. Configuration File Migration

Migrate seamlessly between different frameworks and tools, such as Docker Compose (YAML) to Kubernetes (JSON), or .env format to TOML format.

3. Database & Data Migration

Convert CSV files exported from databases to JSON for importing into NoSQL databases, or convert JSON data to CSV for editing and analysis in Excel.

4. Internationalization (i18n) File Conversion

Convert JSON translation files to YAML format, or Java Properties format to JSON, enabling translation resource sharing across different frameworks.

5. Log Data Analysis

Convert JSON-format log files to CSV for spreadsheet analysis, or convert XML logs to YAML to improve readability.

6. Batch Processing & Automation

Convert INI-format config files to ENV format for Docker environments, or TOML format to JSON for program loading in CI/CD pipelines.

7. Documentation Creation & Sharing

Convert complex JSON data to YAML format to improve readability, or convert CSV data to XML for embedding in technical documentation.

What is Universal Data Converter? Features of Each Format

Universal Data Converter is an integrated tool for converting between major data exchange formats. Understanding the features of each format helps you select the optimal format.

JSON (JavaScript Object Notation)

The most widely used data exchange format. Standard for web APIs, config files, and data storage. Can express hierarchical structures, supporting arrays, objects, numbers, strings, booleans, and null.

CSV (Comma-Separated Values)

Simple format for representing tabular data. High compatibility with Excel, Google Sheets, and databases, efficiently handling large amounts of data. Cannot express hierarchical structures.

TSV (Tab-Separated Values)

Tabular data separated by tab characters. Similar to CSV but advantageous when data contains commas. Commonly used for scientific and statistical data.

XML (Extensible Markup Language)

Markup language with hierarchical structure. Strict schema definition possible, used in enterprise systems, legacy APIs, and RSS/Atom feeds. More verbose than JSON but can include attributes and comments.

YAML (YAML Ain't Markup Language)

Human-readable hierarchical data format. Widely used in DevOps tool config files like Docker Compose, Kubernetes, Ansible, and GitHub Actions. Expresses hierarchy through indentation.

TOML (Tom's Obvious Minimal Language)

Simple and readable config file format. Adopted by Rust (Cargo.toml), Python (pyproject.toml), Hugo, etc. Has clear section structure and data types.

INI (Initialization File)

Classic config file format. Used in Windows applications, PHP (php.ini), Git (.gitconfig), etc. Consists of simple key=value pairs and sections.

ENV (Environment Variables)

Format for defining environment variables. Used as .env files in Docker, Node.js, Laravel, Django, etc. Key=value format with no hierarchical structure.

Properties (Java Properties)

Java standard config file format. Used in Java applications like Spring Boot and Apache Tomcat. Format is key=value or key:value.

Uses and Benefits of Universal Data Converter

1. Efficiency Through Unified Tool

Previously required separate tools (JSONtoCSV, CSVtoJSON, XMLtoYAML, etc.), but Universal Data Converter enables all conversions in one tool. Only one bookmark needed, dramatically reducing learning costs.

2. Bidirectional Conversion Support

Can convert from any format to any format. For example, CSV→JSON, JSON→YAML, YAML→XML, XML→CSV, etc. Supports 81 conversion patterns (9×9).

3. Data Validation

Automatically validates data before conversion. Structured formats like JSON, XML, YAML, and TOML immediately detect syntax errors and display detailed error messages.

4. Data Structure Preservation

Preserves original data structure as much as possible during conversion. When converting from hierarchical formats (JSON, XML, YAML) to tabular formats (CSV, TSV), uses optimal algorithms for flattening nested structures.

5. Flexible Conversion Options

Provides conversion options suited to your needs, such as CSV delimiter selection, JSON formatting/minification, and XML root element name specification. Customizable for your development environment and requirements.

6. Privacy Protection

All processing is completed in your browser, with no data sent to servers. Even highly confidential API specs, customer data, and config files can be converted safely.

7. High-Speed Processing

Uses optimized JavaScript libraries to convert large datasets quickly. Smoothly processes CSV files with thousands of rows and deeply nested JSON data.

Conversion Tips and Best Practices

CSV/TSV to JSON Conversion

When using the first row as a header row, each column name becomes a JSON key. If there's no header, key names like "column1", "column2" are automatically generated.

JSON to CSV/TSV Conversion

Nested JSON objects are flattened using dot notation (e.g., "user.name", "user.email"). Arrays are joined with newlines or commas.

XML Conversion Root Element

When converting from JSON or YAML to XML, you can specify the root element name. Default is "root" but can be changed to match your API schema.

YAML/TOML Hierarchical Structure

YAML expresses hierarchy with indentation, TOML with sections ([section]). Automatically converted to appropriate format during conversion.

ENV/Properties Format Limitations

ENV and Properties formats have no hierarchical structure, so nested data is converted to flat key names like "KEY_NESTED_VALUE".

Processing Large Data

When converting data with thousands of rows, recommend removing unnecessary data beforehand to save browser memory.

Frequently Asked Questions (FAQ)

Which formats can I convert between?

You can convert between 9 formats (JSON, CSV, TSV, XML, YAML, TOML, INI, ENV, Properties) in 81 combinations. Bidirectional conversion is supported for all format pairs.

Can I convert large data files?

Yes, as long as they're within browser processing limits. Generally, files up to several MB can be converted smoothly. For very large files (tens of MB or more), command-line tools (jq, yq, pandoc, etc.) are recommended.

What happens when converting nested JSON data to CSV?

Nested objects are flattened using dot notation. For example, {"user": {"name": "John"}} becomes a CSV column "user.name". Arrays are joined with newlines or commas.

Are XML attributes preserved during conversion?

Yes, when converting from XML to JSON or YAML, attributes are preserved as special keys named "@attribute_name". They're restored as attributes during reverse conversion.

What character encodings are supported?

UTF-8 encoding is supported. All Unicode characters including Japanese, Chinese, Korean, and emojis are processed correctly.

What should I do if I get an error?

Error messages display the problem location and how to fix it. Check for syntax errors in JSON, XML, YAML, or TOML (missing closing brackets, indentation errors, etc.). Using online validation tools (JSONLint, etc.) is also convenient.

Can I download the conversion result as a file?

Yes, clicking the "Download" button downloads the conversion result as a file with the appropriate extension (.json, .csv, .xml, etc.).

Is it safe to convert confidential data with online tools?

Our tool completes all processing in your browser and does not send data to servers. However, for extremely confidential data (production API keys, personal information, etc.), using command-line tools in a local environment is recommended.