YAML to JSON Converter Online
Convert between YAML and JSON formats instantly. Bidirectional, real-time conversion with customizable indentation.
What Is YAML to JSON Conversion?
YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) are two popular data serialization formats. YAML uses indentation and minimal syntax for human readability, while JSON uses braces and brackets for machine parsing. Converting between them is a common task in software development, DevOps, and configuration management.
How to Convert YAML to JSON
- Paste YAML — Enter or paste your YAML content in the left panel
- See JSON Instantly — The JSON output appears in real-time on the right panel
- Adjust Indentation — Choose 2 or 4 spaces for the JSON output
- Reverse Direction — Click the swap button or type in the JSON panel to convert JSON to YAML
- Copy or Download — Use the action buttons to copy to clipboard or download as a file
Why Use This YAML/JSON Converter?
- Bidirectional — Convert YAML to JSON or JSON to YAML in one tool
- Real-Time — Output updates as you type, no submit button needed
- Error Messages — Clear syntax error reporting helps you fix invalid YAML or JSON
- Indentation Control — Choose 2 or 4 space indentation for clean formatting
- Download Support — Save converted output as .yaml or .json files
- Privacy — All conversion happens in your browser. No data is sent to any server
FreeToolbox vs Other YAML/JSON Converters
| Feature | FreeToolbox | transform.tools | jsonformatter.org |
|---|---|---|---|
| Bidirectional | Yes | Yes | No |
| Real-time | Yes | Yes | No (button) |
| Indent Options | 2/4 spaces | No | No |
| Download | YAML + JSON | No | No |
| Error Display | Inline | Modal | Alert |
| Ads | Minimal | Moderate | Heavy |
FAQ
Can I convert JSON to YAML with this tool?
Yes. Simply paste JSON in the right panel or click the swap button to reverse direction. The tool supports full bidirectional conversion.
Does it support nested YAML structures?
Yes. The tool uses the js-yaml library which fully supports nested objects, arrays, multi-line strings, anchors, and all standard YAML 1.2 features.
What happens if my YAML has syntax errors?
The tool displays a clear error message below the YAML panel showing the line and nature of the syntax error so you can fix it.
Is my data sent to a server?
No. All conversion is performed entirely in your browser using JavaScript. No data leaves your device.
What is the maximum file size I can convert?
There is no hard limit, but very large files (over 10MB) may cause browser slowdowns. For typical configuration files and API responses, the tool handles them instantly.