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JSON to YAML Converter
Paste JSON and get clean, readable YAML instantly. Upload a .json file or download the result as .yaml.
Runs in your browser. Your data is never sent to a server.
How to use the JSON to YAML
Paste or upload JSON
Paste JSON into the left box, drop a .json file or click Sample to see how it works.
Choose the style
Pick a 2 or 4 space indent and, if you like, sort keys alphabetically. Errors show the exact problem.
Copy or download YAML
The YAML appears as you type. Copy it to the clipboard or download it as a .yaml file.
Why use this tool
JSON is great for machines, but long configuration files are easier to read and edit in YAML: no braces, no quotes around most strings and room for comments. That is why Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Ansible playbooks and many OpenAPI specs are written in YAML.
This converter parses your JSON in the browser and writes standard YAML 1.2. Strings that YAML could misread, such as “yes”, “no”, “on” or values that look like numbers, are quoted automatically so the data means exactly the same after conversion.
Frequently asked questions
How do I convert JSON to YAML?
Paste your JSON on the left or upload a .json file. The YAML appears on the right immediately; copy it or download it as .yaml.
Can I convert a Swagger or OpenAPI JSON file to YAML?
Yes. Upload the swagger.json or openapi.json file and download the YAML. Key order is preserved, so paths and schemas stay where you expect them.
How do I convert JSON to YAML in Python?
With PyYAML: yaml.safe_dump(json.load(f), sort_keys=False, allow_unicode=True). Without sort_keys=False, PyYAML sorts keys alphabetically.
Why are some values wrapped in quotes?
Words like yes, no, on and off, or strings such as "1.0" and "0123", would be read by YAML as booleans or numbers. Quoting keeps them as text, exactly as in your JSON.
Are my files uploaded to a server?
No. formatmath converts files with code that runs inside your browser. Your files are never uploaded, stored or seen by us.
Is it free?
Yes. There is no watermark and no daily limit. An account is optional and only keeps a history of your conversions.