JSON ↔ YAML Converter
Convert between JSON and YAML instantly. Edit either side and the other updates in real time with syntax validation.
What is a JSON ↔ YAML Converter?
A JSON ↔ YAML converter transforms data between two popular serialisation formats. JSON (JavaScript Object Notation) uses braces, brackets, colons, and quotes — it is compact and universally supported by programming languages and APIs. YAML (YAML Ain't Markup Language) uses indentation and minimal punctuation — it is more human-readable and is the standard format for configuration files in tools like Kubernetes, Docker Compose, GitHub Actions, and Ansible. The two formats represent the same data model, making lossless conversion straightforward.
Common Use Cases
- Convert API responses (JSON) into YAML config files for Kubernetes or Helm charts
- Transform YAML CI/CD pipeline definitions into JSON for programmatic processing
- Migrate configuration between tools that prefer different formats
- Read a JSON API schema and convert it to YAML for OpenAPI spec files
- Debug data structures by switching between compact JSON and readable YAML
How It Works
JSON to YAML: the input is parsed with JSON.parse() into a JavaScript object, then serialised to YAML using the js-yaml library with the dump() function. YAML to JSON: js-yaml.load()parses the YAML (safely, without executing arbitrary code) and the resulting object is serialised withJSON.stringify(). Both operations run in your browser.
Frequently Asked Questions
Are JSON and YAML fully interchangeable?
Nearly. Every valid JSON document is also valid YAML, but YAML supports features JSON does not — such as comments, anchors, and aliases. Comments are lost when converting YAML to JSON. Multi-document YAML files (separated by ---) also cannot be represented as a single JSON document.
Why does YAML use indentation instead of braces?
YAML was designed for human readability. Indentation removes the visual noise of braces and quotes, making configuration files easier to write and review. The trade-off is that indentation errors are a common source of bugs.
Which format should I use for config files?
YAML is the standard for Kubernetes, Docker Compose, GitHub Actions, and most DevOps tooling. JSON is better for API payloads, web storage, and situations where comments are not needed and strict parsing is important.
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JSON vs YAML: JSON is ideal for APIs and data exchange. YAML is preferred for configuration files (Docker, Kubernetes, GitHub Actions) due to its human-readable syntax.
Uses js-yaml for parsing and serialization — all conversions happen locally in your browser.