YAML vs JSON: Differences and How to Convert

YAML and JSON both describe structured data — objects, arrays, strings, numbers, and booleans — so any YAML document has an equivalent JSON one and vice versa. The difference is how they look. JSON uses braces, brackets, and quotes; YAML uses indentation and dashes, with far less punctuation.

That makes JSON the natural fit for machine-to-machine use like APIs, where strict syntax is an advantage, and YAML the favorite for configuration files that humans edit by hand, where readability wins.

You'll meet JSON in API responses, package manifests, and anywhere data is exchanged between programs. Its rigid quoting and commas are easy for machines to parse and hard to get subtly wrong.

YAML dominates configuration — Docker Compose, Kubernetes manifests, CI pipelines, and app settings. Its indentation-based layout reads like an outline, which is why teams reach for it when a person will be editing the file often.

Converting is mostly mechanical, but two things trip people up. YAML is whitespace-sensitive, so a stray tab or misaligned indent changes the structure or breaks parsing; and a YAML file can contain several documents separated by ---, which become a JSON array when converted.

The converter reports parse errors inline so you can fix a bad indent quickly, and handles multi-document files automatically. Paste YAML to get formatted JSON, or paste JSON to get readable YAML, entirely in your browser.