YAML to JSON Converter

Your YAML JSON output

<iframe src="https://olltools.com/embed/dev/yaml-to-json-converter" width="100%" height="400" frameborder="0"></iframe>

Paste YAML and get JSON instantly — anchors and aliases are fully resolved (not left as an unsupported error), and a tab-character indentation mistake is pointed out by exact line number instead of a cryptic parser message.

How it works

Paste or type YAML on the left
JSON output updates live on the right
Anchors (&) and aliases (*) are automatically expanded into their full values

Frequently asked questions

Does this support YAML anchors and aliases?

Yes — anchors (&name) and aliases (*name) are fully resolved into their expanded values in the JSON output, not left as an error.

Why do I get an error about a tab character?

YAML forbids tabs for indentation (spaces only) — a tab and a space look identical in most editors, so this is flagged by exact line number instead of a generic parser error.

Is my YAML sent to a server?

No — parsing happens entirely in your browser.

#YamlToJsonConverter#ConvertYamlToJsonOnline#YamlAnchorsAliasesJson#YamlTabCharacterError

Related tools

From the blog

dev

The YAML error that's actually an invisible tab character, explained by line number

YAML forbids tabs for indentation, but tabs and spaces look identical in most editors — so the parser error rarely points at the real problem clearly. We check for it directly.

2026-08-30

Update history

2026-08-30 Added: a cover image (YAML tree transforming into JSON brackets, with a magnifying glass on a hidden tab character) — used as the card thumbnail, social share image, and blog title image.
2026-08-30 Launched: live YAML to JSON conversion (no button) — anchors/aliases fully resolved, and tab-character indentation mistakes (invisible in most editors) are flagged with the exact line number instead of a cryptic parser error.