ToolsOps

JSON/YAML

YAML to JSON and JSON to YAML Converter

Paste your YAML or JSON and get an instant conversion to the other format. Supports objects, arrays, scalars, booleans and null. The conversion runs entirely in your browser using the yaml library (eemeli): no network requests, nothing stored in localStorage, and your data never reaches a server.

Conversion runs in your browser. The content is never sent to a server.

Conversion direction

Examples

  • name: ToolsOps port: 8080 debug: falseSimple YAML configuration
  • {"name":"ToolsOps","port":8080,"debug":false}Simple JSON configuration
  • - alpha - beta - gammaYAML list
  • server: host: localhost tls: enabled: trueNested YAML object
  • {"a":true,"b":false,"c":null}Booleans and null in JSON

Frequently asked questions

Is my data sent to a server?
No. All the conversion happens inside your browser. There are no backend calls, nothing is stored in localStorage, and everything disappears when you close the tab. It's safe to paste internal configurations, but if you paste real secrets, always factor in the risk of having them in your clipboard or browser history.
What's the difference between YAML and JSON?
Both are formats for structured data. JSON is strict, compact and widely used in APIs; YAML is more readable, supports comments and is common in config files (Kubernetes, GitHub Actions, docker-compose). YAML is effectively a superset of JSON: valid JSON is usually also valid YAML.
Can I convert YAML with arrays and nested objects?
Yes. Any recursive structure of objects, arrays and scalars (string, number, boolean, null) is supported. The result preserves the full hierarchy.
Does it support anchors, aliases or advanced YAML?
The library resolves anchors (&name) and aliases (*name) during conversion. In the resulting JSON the value appears expanded at every place the alias was used: the original anchor form is lost. Advanced types (timestamps, sets, custom tags) are mapped to the closest JSON equivalent; some cases may end up as plain objects.
Why might a conversion fail?
The most common causes: poorly indented YAML, unclosed quotes, JSON with a trailing comma or unquoted keys, multi-document YAML (repeated "---"), or structures with self-referencing anchors (cycles) that cannot be serialized to JSON. The tool reports the line and column when the parser exposes them.
Can I use it for configuration files?
Yes, that's one of the typical use cases: converting between configuration formats (helm values.yaml ↔ JSON for validation, GitHub Actions workflows, docker-compose, etc.). Note that YAML comments are lost when converting to JSON because JSON does not support comments.
Is there a size limit?
Technically no, but large inputs (>1 MB) may take a moment because parsing is synchronous and blocks the UI thread. The tool shows a notice when that threshold is exceeded.