YAML Formatter & Validator
Formats YAML so the indentation is consistent and easy to read and debug.
Prettify your YAML string into a friendly, human-readable format.
Steps and notes
What is YAML Formatter & Validator — Format YAML Online?
Normalise a YAML document into clean, consistent indentation — the single most common source of YAML bugs. Paste your config, get it re-emitted with uniform spacing and structure, and use the parse step as a syntax check before kubectl or your CI pipeline rejects it for one stray tab.
- Paste the YAML
- Click format
- Copy the result
- YAML expresses hierarchy through indentation, and only spaces work — never tabs
Frequently asked questions
- Why does YAML break so easily?
- Structure comes from indentation, not brackets — one wrong space changes nesting, and tabs are forbidden outright. Formatting normalises all of it and fails fast on anything unparseable.
- Does the formatter fix wrong indentation?
- It re-emits whatever the parser understood. If your YAML parses, the output comes out with consistent indentation; if the structure itself is ambiguous, parsing fails and points you at the line.
- Will it preserve my comments and anchors?
- Parse-and-rewrite loses comments in some cases, because comments are not part of the parsed model. Keep a version-controlled copy of commented configs rather than round-tripping through any formatter.
Category: Development
YAML & TOML workflow
YAML Formatter & Validator — Format YAML Online → YAML to JSON converter → JSON to YAML converter → YAML to TOML → TOML to YAML