A JSON/YAML/TOML converter transforms data between three popular configuration formats in seconds. Paste your JSON, YAML, or TOML and instantly get the equivalent in your target format. Whether you are migrating config files, switching between tools, or learning a new format, this free online JSON/YAML/TOML converter handles it with one click. No signup required. Try it now for instant results.
✨ Try the Free Online JSON/YAML/TOML Converter
How to Use JSON/YAML/TOML Converter — Step by Step
Step 1: Paste your data
Paste your JSON, YAML, or TOML data into the input box. The tool auto-detects the format — JSON starts with { or [, YAML uses key: value pairs, and TOML uses key = value pairs.
Step 2: Choose your target format
Click the button for your desired output format: JSON, YAML, or TOML. The selected button turns blue to indicate the active target.
Step 3: Review the converted output
The tool parses your input and converts it to the selected format in real time. The output appears instantly in the results box.
Step 4: Copy and use
Click the copy button to grab the converted data, then paste it into your config file, deployment script, or documentation.
Real-World Examples
Docker Compose Migration (DevOps Engineer): Your team is migrating from Docker Compose (YAML) to a Kubernetes-native setup that uses TOML for certain configs. You paste your docker-compose.yml content, select TOML as the target, and instantly get a valid TOML config ready for your new pipeline.
CI/CD Pipeline (Developer): Your GitHub Actions workflow is in YAML, but your local testing tool requires JSON config. The converter transforms your YAML workflow into valid JSON in seconds, saving you from manual reformatting.
Documentation (Technical Writer): You are writing API docs and need to show the same configuration in all three formats for different audiences. The converter generates all three versions from a single source in under a minute.
Config Standardization (Platform Team): Your microservices use mixed formats — some JSON, some YAML. You convert all to JSON for a unified configuration management system.
Learning New Formats (Student): You know JSON but need to learn YAML for Kubernetes. Paste your JSON configs and convert to YAML to see the structural differences and syntax side by side.
Features
- Converts between JSON, YAML, and TOML — all three directions supported
- Auto-detects input format from structure (JSON, YAML, or TOML)
- Real-time conversion with no uploads, signup, or page reloads
- 100% private — all processing happens locally in your browser
- Handles nested objects and arrays within each format
- Free forever with one-click copy and clear buttons
- Supports YAML lists, TOML arrays, and JSON arrays interchangeably
- Preserves data types (strings, numbers, booleans, null) during conversion
Tips & Best Practices
- Validate first: Ensure your input is valid JSON/YAML/TOML before converting. Use JSON Formatter to validate JSON first.
- Watch for type differences: JSON has explicit types (strings, numbers, booleans). YAML/TOML inference may differ. Review numeric vs string values after conversion.
- Handle comments: JSON doesn't support comments. YAML uses #, TOML uses #. Comments are lost when converting TO JSON.
- Deep nesting limits: Deeply nested structures (3+ levels) may lose formatting fidelity. Flatten when possible.
- Arrays in TOML: TOML arrays use [item1, item2] syntax. The converter handles inline arrays but complex multi-line arrays may need manual review.
- Use for config migration: When migrating between tools (Docker → Kubernetes, Ansible → Terraform), convert config formats in bulk.
- Review boolean values: JSON uses true/false, YAML uses true/false/yes/no, TOML uses true/false. All convert to JSON booleans.
- Handle null values: JSON uses null, YAML uses null/~, TOML has no direct null. Null may become empty string in TOML.
Common Use Cases
DevOps & Infrastructure Engineers
Migrate configuration files between Docker Compose, Kubernetes manifests, and application config formats.
Backend & Full-Stack Developers
Convert API response formats and config files when switching between frameworks that prefer different data formats.
Technical Writers & Documentation Teams
Show the same configuration example in all three formats for comprehensive documentation.
Platform Engineers
Standardize configuration formats across microservices for unified management.
CI/CD Pipeline Authors
Convert GitHub Actions YAML to JSON for programmatic manipulation, or TOML for tools like Trivy or Renovate.
Application Config Management
Convert legacy JSON configs to YAML for Spring Boot, or TOML for Rust/Cargo projects.
Frequently Asked Questions
Q: Does it handle nested objects?
A: Yes. The converter supports nested objects and arrays. However, deeply nested structures (more than 3 levels) may lose some formatting fidelity. For complex configs, review the output carefully.
Q: Does it handle arrays?
A: Yes. JSON arrays, YAML lists, and TOML arrays are converted between formats. Inline arrays and multi-line arrays are both supported.
Q: Is there a size limit?
A: For best performance, keep input under 100KB. Very large config files may take a moment to process but should still work.
Q: Is my data private?
A: Yes. All processing happens locally in your browser. Your data is never uploaded or stored.
Q: Can I use it on my phone?
A: Absolutely. The converter works on any device with a modern browser.
Q: What if my input has errors?
A: The tool shows an error message if it cannot parse the input. Check your syntax — missing quotes, trailing commas, or invalid YAML indentation are common issues.
Q: Does it preserve comments?
A: No. JSON does not support comments. When converting from YAML or TOML to JSON, comments are lost. When converting between YAML and TOML, comments may not be preserved.
Q: Can it handle TOML tables and inline tables?
A: The converter supports basic TOML tables and inline tables. Complex nested table structures may require manual review after conversion.
Q: What about YAML anchors and aliases?
A: YAML anchors (&) and aliases (*) for DRY configuration are not preserved in conversion. The expanded values are converted instead.
Q: Can I convert JSON with trailing commas?
A: Standard JSON doesn't allow trailing commas. The parser will reject them. Remove trailing commas before converting.