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Convert JSON to YAML for configs. Use for JSON input; for YAML validation use yaml-formatter, for TOML cross-format use toml-converter. Input: JSON ≤10MB. Returns YAML or JSON error. 100% client-side.
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Provides bidirectional conversion between JSON and YAML with indentation control (2 or 4 spaces), configurable quote styles (single, double, or none for strings), and null value representation options. Supports block scalar styles for multiline strings and custom line width wrapping.
YAML is widely used for configuration files in DevOps (Kubernetes, Docker Compose, CI/CD pipelines) while JSON is common for data interchange. Offers seamless conversion in both directions to avoid format lock-in.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
DevOps engineers, cloud infrastructure developers, CI/CD pipeline maintainers, and anyone working with configuration-as-code needing to switch between JSON and YAML formats.
Select the conversion direction (JSON to YAML or YAML to JSON) using the toggle at the top
Paste your source data into the input editor; the tool auto-detects the format and validates syntax
Configure output settings: indentation (2 or 4 spaces), string quote style (single/double/none), and null representation (null/~/null literal)
For multiline strings, enable block scalar style to output literal blocks (|) instead of quoted strings
Set the maximum line width for wrapping long string values; disable for no wrapping
Click "Convert" and review the formatted output; copy or download the result; use "Swap" to reverse direction
Input JSON: {"name":"Alice","age":30,"address":{"city":"NYC"}} with indent=2 -> Output YAML:\nname: Alice\nage: 30\naddress:\n city: NYCInput YAML: "name: Bob\npreferences:\n - color: red\n - color: blue" -> Output JSON: {"name":"Bob","preferences":[{"color":"red"},{"color":"blue"}]}Does the conversion preserve the original data structure perfectly?
Yes, the conversion is lossless for data; however, YAML comments and some formatting nuances are not preserved.
Can it handle large multi-document YAML (with --- separators)?
Yes, each document is processed independently.
How does it handle YAML anchors and aliases?
Anchors and aliases are resolved to their actual values; the reference structure is not preserved.
What YAML version does this use?
The tool follows the YAML 1.2 specification, which changes boolean parsing rules from YAML 1.1.
Authoritative specifications, standards, and in-depth reading for JSON to YAML Converter.
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