Convert YAML to JSON Online
YAML is the format humans write — JSON is the format machines consume. Almost every CI/CD tool, API and serverless runtime speaks JSON, so converting your hand-edited YAML to JSON is a daily task for any DevOps or backend engineer. Paste your YAML below and we return clean, valid JSON instantly. Multi-document YAML is flattened to a JSON array. The conversion runs entirely in your browser — your config never leaves your machine.
YAML Converter - Convert Between Formats10 formats
Free YAML converter online. Convert YAML to JSON, XML, TOML, INI, Properties, CSV, and more. Also convert INI to YAML, TOML to YAML, and Properties to YAML. With automatic format detection.
Input (YAML)
Output (JSON)
Result will appear here
When you'd convert YAML to JSON
Real-world scenarios where this conversion is the right move.
Feed configs to APIs and CLIs
Tools like AWS CloudFormation, Terraform or kubectl ultimately work with JSON internally. Convert your YAML before sending it to APIs that only accept JSON.
Inspect Kubernetes manifests
Some kubectl operations and admission controllers report errors against the JSON-flattened version of your manifest. Converting locally helps reproduce and debug those errors.
Diff between environments
JSON is more diff-friendly than YAML when comparing configurations across branches or environments — anchors and aliases get fully expanded.
YAML vs JSON — what changes
Quick reference for the structural differences between both formats.
| Aspect | YAML | JSON |
|---|---|---|
| Comments | YAML supports # comments throughout. | JSON has no comment syntax — comments are stripped on conversion. |
| Anchors and aliases | YAML lets you reuse values with & and *. | JSON expands every reference into its full value. |
| Multi-document | YAML supports multiple documents separated by ---. | JSON returns an array containing every document. |
| Trailing commas | YAML uses indentation, no commas needed. | JSON forbids trailing commas — the output is strict JSON. |
Frequently asked questions
Is the YAML to JSON conversion lossless?
Yes for data structure. Comments are dropped because JSON does not support them, and YAML-specific features like anchors and tags are expanded into plain JSON values.
Does it support Kubernetes YAML?
Yes. Kubernetes manifests use standard YAML 1.2 and convert cleanly to JSON. The parser handles multi-document files (separated by ---) by returning a JSON array.
Is my YAML uploaded to a server?
No. The conversion runs in your browser using js-yaml. Nothing is sent to our servers — you can verify by opening the network tab in DevTools.
What if my YAML has errors?
You will get an inline error with the line and column of the issue. Use our YAML validator if you want detailed lint warnings and suggestions.
Other conversions
Hop into another conversion that shares one of these formats.