JSON ⇄ YAML Converter

Paste JSON to get clean, properly indented YAML — or paste YAML to get formatted JSON. Powered by the js-yaml library running locally, so configs with secrets never leave your machine.

On-device — downloads its library once Developer Free · no signup

Network notice: Your data never leaves your device. The open-source converter (js-yaml, MIT license) is fetched from the cdnjs CDN the first time you use the tool.

How to use

Paste JSON or YAML into the input box.
Click the direction you need: JSON → YAML or YAML → JSON.
Copy the converted output.

Examples

JSON

{"replicas": 3, "image": "nginx:1.25"}

YAML

replicas: 3
image: nginx:1.25

Supported formats

JSON input: strict JSON (RFC 8259). YAML input: YAML 1.2 via js-yaml's safe loader.
Output: 2-space indented JSON, or YAML wrapped at 100 columns.

Privacy

Your input is processed in your browser and is never uploaded. The first time you use the tool, your browser downloads its open-source processing library from cdnjs.cloudflare.com — the library is downloaded, your data is not sent. Privacy policy.

Limitations

YAML features with no JSON equivalent (anchors/aliases, comments, custom tags) are resolved or dropped in conversion — round-tripping such files loses them.

FAQ

Why convert JSON to YAML?

YAML is the configuration format of Kubernetes, Docker Compose, GitHub Actions and most CI systems — it's the same data model as JSON but easier for humans to read and edit.

Are YAML anchors preserved?

No — anchors and aliases are expanded during parsing, and comments are dropped, because JSON has no way to represent them. The data itself converts faithfully.

Is my config uploaded anywhere?

No. Conversion runs locally with the js-yaml library, so files containing tokens or credentials stay on your machine.