Format Converter: JSON to YAML, TOML, XML Online
Convert between JSON, YAML, TOML, and XML instantly. All 12 combinations supported. Validate syntax instantly.
Try the free online tool mentioned in this guide:Format Converter
When to convert between data formats
Different tools and languages prefer different formats:
- JSON — JavaScript, APIs, web.
- YAML — Configuration files (Kubernetes, Ansible, Docker Compose).
- TOML — Configuration (Python Poetry, Rust Cargo).
- XML — Legacy systems, SOAP APIs, document-oriented data.
Often you need to convert between them: take a JSON API response and convert to YAML for a config file, or read a TOML config and output JSON for processing. MyDevTools Format Converter handles all 12 combinations.
Data structure equivalents
All four formats represent the same data structures: objects/maps, arrays/lists, strings, numbers, and booleans. The syntax differs, but the underlying meaning is identical.
// Same data in four formats
// JSON
{"name": "Alice", "age": 30, "active": true}
// YAML
name: Alice
age: 30
active: true
// TOML
name = "Alice"
age = 30
active = true
// XML
<root>
<name>Alice</name>
<age>30</age>
<active>true</active>
</root>Conversion workflow examples
API to Config — Fetch JSON from an API, convert to YAML, edit in a text editor, convert back to JSON for processing.
Migration — Convert legacy XML config to JSON or YAML for modern tooling.
Multi-language compatibility — Convert JSON schema to TOML for Rust projects or YAML for Python projects.
Frequently asked questions
What if my data has nested structures?
All formats support nesting. Arrays become lists in YAML, arrays in JSON, sequences in TOML, and XML elements.
Can I convert XML with attributes?
Yes, XML attributes are preserved in the conversion and typically become regular object properties in JSON/YAML/TOML.
Is there data loss when converting?
Minimal, if any. All four formats support the same core data types. Some format-specific features (XML namespaces, YAML anchors) may not map perfectly.