JSON to YAML Converter
Drop a JSON file, get a clean YAML file — ready for Kubernetes, GitHub Actions, Ansible, or any config that prefers readability over punctuation.
Drop your JSON file here
Converts to .yaml — stays on your device
Why convert JSON to YAML?
- Turning a Postman export or API response into a Kubernetes ConfigMap or Secret body.
- Migrating a `.json` config from a legacy tool into a modern GitHub Actions workflow file.
- Generating starter YAML from a JSON schema when scaffolding Helm chart values.
- Converting JSON fixtures from a Node service into Ansible group_vars for infrastructure automation.
- Prepping OpenAPI definitions for tools like ReadMe or Stoplight that default to YAML.
- Making a dense JSON config reviewable in a PR — YAML's indentation is far easier to diff.
How our converter works
Your JSON is parsed into a JavaScript object, then re-emitted as YAML using js-yaml — the reference implementation. Strings, numbers, booleans, arrays, and nested objects all map cleanly. The output uses 2-space indentation and 120-column line wrapping (the Kubernetes/GitHub convention). Circular references are rejected with a clear error. Everything runs in your browser — configs with secrets, API keys, or internal schemas never leave your device.
JSON vs YAML — when to use which
| Feature | JSON | YAML |
|---|---|---|
| Readability | Dense, punctuation-heavy | Indented, visually scannable |
| Comments | Not supported | Full # line-comment support |
| Primary use | APIs, logs, data interchange | Configs, CI/CD, infrastructure |
| Parser strictness | Strict — trailing comma is an error | Forgiving — multi-line strings, anchors |
| Typed by default | Yes | Yes (with some surprising coercions) |
Frequently asked questions
Does the output work with Kubernetes?
Yes — the output is standard YAML 1.2 with 2-space indentation, which is exactly what kubectl, Helm, and ArgoCD expect. Paste it directly into a manifest or pipe it through `kubectl apply -f -`.
Does it preserve key order?
Yes. Insertion order is preserved through the conversion — so your JSON's field order survives into the YAML output, which matters for reviewability even though YAML parsers don't care about order.
What about nested objects and arrays?
Fully supported — arrays become YAML sequences (- dash lists), objects become nested mappings. Deeply nested Helm values files and k8s manifests round-trip cleanly.
Are my files uploaded?
No. The conversion runs entirely in your browser. Configs containing secrets, API keys, DB connection strings, or customer data stay on your device.
What if my JSON has trailing commas or comments?
Strict JSON rejects both. If your source is JSON5 or JSONC (VS Code's commented JSON), strip comments first — we follow the JSON spec. The error message will point to the line.
About the JSON format
JSON (JavaScript Object Notation) is the default data-interchange format of the modern web — lightweight, strict, and parsable by every language. YAML (YAML Ain't Markup Language) is JSON's config-friendly cousin: a strict superset of JSON syntactically, with support for comments, anchors, multi-line strings, and whitespace-based structure. YAML became dominant in DevOps because it's reviewable: a 200-line Kubernetes manifest in YAML is readable in a PR; the same data in JSON is a wall of braces. Converting from JSON to YAML is almost always a one-way move — something produced JSON (an API response, a script), and now it needs to live in a config file. The output is valid YAML 1.2, compatible with kubectl, Helm, GitHub Actions, Ansible, and every other tool in the CI/CD and infrastructure space.