Paste JSON or open a .json file and get clean YAML for Kubernetes, Docker Compose, GitHub Actions or Ansible. Strings that a YAML parser would read as something else (no, NO, 01234, 2026-03-14, 1_000) are quoted, so the data comes back identical. Nothing is uploaded.
Open a file: (or drop it on this box)
YAML guesses types from unquoted text, and parsers disagree. PyYAML and other YAML 1.1 readers turn no, NO, off, y and n into booleans (the "Norway problem": a country code NO becomes false), 2026-03-14 into a date, 1_000 into 1000, and 12:30 into 750 (base 60). This converter quotes every string that any of those rules would change. We checked it by converting a JSON file of 41 such strings and loading the YAML back with both js-yaml and PyYAML 6.0.3: both returned data identical to the input. Before we added the YAML 1.1 rules, PyYAML read "2026-03-14" back as a date and "1_000" as an integer.
Pick 2 or 4 spaces of indentation, single or double quotes, and alphabetical key order. Long strings are never folded, and multi-line strings are written as | blocks. JSON numbers above 253 (9,007,199,254,740,992) lose precision when your browser reads the JSON, so keep long IDs as strings in the JSON.
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Is my file uploaded? No. Parsing and conversion run in your browser with js-yaml and fast-xml-parser; this page sends nothing to a server, so it works for secrets in config files.
Can it convert the other way? Yes: every page reads JSON, YAML and XML (detected automatically), and the "Convert to" menu picks the output, so it also converts XML to YAML or reformats a file in its own format. Related: YAML to JSON, XML to JSON, JSON to XML, CSV to JSON, JSON to CSV, JSON to Excel.
YAML to JSON · JSON formatter · XML to JSON · JSON to XML · CSV to JSON · JSON to CSV · Excel to JSON Converter · JSON Diff · JSON to Excel Converter · JSON Validator · Minify JSON · all free tools