JSON to YAML Converter

YAML is the format humans choose when configuration has to be read, edited and reviewed — Kubernetes manifests, CI pipelines, docker-compose files. JSON is what machines exchange. This converter bridges the two: paste JSON and receive properly indented YAML with arrays as dash lists, nested objects nested, and strings quoted only when YAML would otherwise misread them. It is the fast, safe way to turn an API response or a JSON config into something a person can comfortably maintain. One YAML subtlety causes more production incidents than any other: unquoted scalars that look like other types. The string “no” becomes boolean false in YAML 1.1 parsers, “0123” may read as octal, and a value containing “: ” breaks the mapping entirely. This converter quotes defensively wherever ambiguity lurks, which is why its output sometimes looks slightly more quoted than hand-written YAML — that caution is what keeps a config file meaning the same thing after conversion as before.

Quick Answer: Paste JSON and the YAML appears instantly, correctly indented with strings quoted only when needed. Copy it or download it as a .yaml file.

Free Online Tool

JSON input
{“name”:”shop-api”,”replicas”:3,”features”:{“auth”:true,”cache”:”yes”},”ports”:[80,443],”owner”:null}

YAML output

How to Use the JSON to YAML Converter

Paste your JSON into the input box.
Read the converted YAML in the output panel.
Check strings with special characters — they are quoted automatically where needed.
Copy the YAML, or download it as a file.
Paste it into your config, manifest or pipeline.

Key Features

Instant JSON to YAML conversion as you type
Correct two-space indentation for nested structures
Smart quoting only when a string could be misread
Copy button plus .yaml file download
Runs locally in your browser — nothing uploaded

Best Practices and Tips

Strings like “yes”, “on” or “123” are quoted on purpose: unquoted, YAML would read them as booleans or numbers.
Validate serious configs after conversion with your platform’s own linter before deploying.
Keep the JSON source if a tool downstream still needs it — conversion is one-way friendly but not magical.
Watch dates: JSON strings that look like dates stay strings in the YAML output, quoted when ambiguous.
For huge files, convert in sections to keep the page responsive.
After converting configuration, diff behaviour, not text: load the YAML in your actual stack and compare the parsed object with the original JSON before deploying.

Common Mistakes to Avoid

Removing the protective quotes around yes/no/on/off strings, silently changing types in YAML.
Mixing tabs into the output later — YAML forbids tabs for indentation.
Assuming comments survive: JSON has none, so the YAML has none to preserve.
Pasting YAML into a JSON-only field and blaming the converter.

Frequently Asked Questions

Is YAML a superset of JSON?

Largely, yes — YAML was designed to be a friendlier superset, and most JSON documents are valid YAML. This converter produces the idiomatic block style people expect.

Why are some strings quoted in the output?

When a plain string could be interpreted as a number, boolean, null or a special character sequence, quotes are added to preserve its exact string value.

Can it convert arrays at the top level?

Yes — a top-level JSON array becomes a top-level YAML list of dash items, including lists of objects.

Does my data leave the browser?

No. Conversion happens locally in JavaScript on your device.

Is this converter free?

Yes — free, unlimited and no sign-up required.

Why are some strings quoted in the YAML output?

Because unquoted they would change meaning — strings resembling booleans, numbers, or containing special characters are quoted to guarantee the parsed value round-trips exactly.