What is the difference between YAML and JSON?

Both YAML and JSON represent structured data. JSON uses curly braces and quotes and is more compact; YAML uses indentation and is more human-readable. YAML is a superset of JSON, meaning valid JSON is also valid YAML. YAML is common in config files (GitHub Actions, Kubernetes, Docker Compose) while JSON is standard for APIs.

Does YAML to JSON conversion ever lose information?

Some YAML features have no direct JSON equivalent — such as comments, multi-document files, and YAML-specific types. Comments are stripped during conversion. If your YAML file contains anchors and aliases, they are resolved before output.

Is my data sent to a server?

No. Conversion happens entirely in your browser using the js-yaml library. Nothing is transmitted anywhere.

免费工具

YAML ↔ JSON Converter

Convert YAML to JSON or JSON to YAML instantly. Paste your input, see the result in real time, and copy or swap directions with one click.

YAML

JSON

JSON output will appear here

When to use YAML vs JSON

YAML is preferred for configuration files — GitHub Actions, Kubernetes, Docker Compose — because it is human-readable. JSON is the standard for REST APIs.

What is preserved

All values, types (strings, numbers, booleans, nulls), nested objects, and arrays are preserved. YAML comments are dropped. Anchors and aliases are resolved.

How to use

Select YAML → JSON or JSON → YAML.
Paste your content.
The output appears instantly.
Click Copy or Swap & flip.

Conversion runs in your browser using js-yaml — nothing is uploaded to any server.

常见问题

What is the difference between YAML and JSON?: Both represent structured data. JSON uses braces and quotes; YAML uses indentation. YAML is a superset of JSON. YAML is common in config files; JSON is standard for APIs.
Does YAML to JSON conversion lose information?: Comments are stripped. Anchors and aliases are resolved to their full values. All data values are preserved.