YAML, XML & TOML

Six converters share one layout: paste on the left, get the result on the right as you type.

From JSON	To JSON
JSON → YAML	YAML → JSON
JSON → XML	XML → JSON
JSON → TOML	TOML → JSON

The swap button (for example YAML → JSON) opens the other direction and takes your output with it, so you can round-trip a file.

Every converter keeps big integers exact (like 9007199254740993). When something can’t be carried over — a null in TOML, a key that isn’t a valid XML name — a yellow note under the output says what changed. Nothing is dropped silently.

YAML

JSON → YAML writes readable block-style YAML. Multi-line strings become | blocks. Choose 2 or 4 spaces.

Strings that older YAML parsers would misread are quoted. "yes", "no", "on", "off" and "010" are written as "yes" rather than yes. YAML 1.1 (used by PyYAML, Ruby and many CI tools) would otherwise turn them into booleans or octal numbers.

YAML → JSON reads YAML 1.2:

• Only true and false are booleans, so country: NO stays the string "NO".
• Anchors (&name), aliases (*name) and merge keys (<<: *name) are expanded.
• Dates such as 2026-10-15 stay strings.
• A file with several documents separated by --- converts only the first one by default. Tick All documents to get a JSON array with one item per document.
• Errors show the line and column, and the line is highlighted.

XML

XML ⇄ JSON uses one convention in both directions:

XML	JSON
<book id="42">	"book": { "@id": "42" }
<price currency="USD">8.99</price>	"price": { "#text": "8.99", "@currency": "USD" }
<tag>a</tag><tag>b</tag>	"tag": ["a", "b"]

XML → JSON options:

• Detect numbers: 12 → 12 and true → true. Values with leading zeros (007) and numbers too long for JavaScript stay strings, so zip codes and IDs are safe.
• Always arrays: every child element becomes an array, even when there’s only one. Code that reads the JSON then always gets the same shape.

JSON → XML:

• A JSON object with one top-level key uses that key as the root element. Anything else is wrapped in the Root name you choose (root by default). A top-level array becomes <root><item>…</item></root>.
• Keys that aren’t valid XML names are fixed: first name → first_name, 1st → _1st.
• <, & and quotes are escaped. Empty values become self-closing tags like <note/>.

TOML

JSON → TOML writes [tables] and [[array tables]], the way Cargo.toml and pyproject.toml are written by hand.

• The JSON must be an object at the top level; TOML files can’t be arrays.
• TOML has no null. Keys with null values are left out, and a note tells you.

TOML → JSON supports TOML 1.0: inline tables, array tables, dotted keys and every string type.

• Dates and times become ISO strings. A local date stays 2026-10-15; a date-time with an offset becomes UTC, like 1979-05-27T15:32:00.000Z.
• Integers up to 64 bits stay exact.

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