A focused YAML workspace

YAML to JSON Converter

Turn readable YAML into strict JSON, with clear syntax feedback and no upload step.

configuration.yaml

service:
  name: catalog
  ready: true
  ports: [8080, 8443]

YAML 1.2

YAML source8 lines · 110 B

JSON result

Waiting for YAML

01 / WORKFLOW

From readable configuration to strict data

Add YAML

Paste YAML, load the built-in example, or choose a local .yaml or .yml file.

Convert locally

The browser parses YAML 1.2 and serializes the resulting value as standard JSON.

Use the result

Copy formatted JSON or download a UTF-8 file for an API, app, test, or migration.

NOTE—01

YAML-aware errors

Parsing failures retain useful line and source context instead of returning an empty result.

NOTE—02

Multiple documents

A YAML stream containing multiple documents becomes a JSON array so no document is silently discarded.

NOTE—03

Browser-local by default

Text and local files stay in the current browser tab; no account or conversion queue is involved.

03 / TYPE MAP

How YAML values arrive in JSON

Most everyday mappings transfer directly, but YAML offers a wider data model. The table shows the result you should expect before you convert a configuration file or data document.

YAMLJSONWhat to expect

name: Ada"name": "Ada"

Plain and quoted YAML strings become JSON strings. Quoting may change because JSON always uses double quotes.

enabled: true"enabled": true

YAML 1.2 booleans map to JSON booleans. Words such as yes and no remain strings under YAML 1.2 rules.

count: 42"count": 42

Ordinary integers and decimal numbers become JSON numbers, subject to JavaScript number precision.

items: [a, b]"items": ["a", "b"]

Block and flow sequences both become JSON arrays while retaining item order.

value: null"value": null

YAML null values become JSON null. An empty YAML value is also commonly parsed as null.

--- / ---[{…}, {…}]

A stream with multiple YAML documents is returned as one JSON array so every document remains available.

04 / CONVERSION LIMITS

Information JSON cannot carry forward

Conversion preserves the data JSON can represent. Presentation details and YAML-only features may be resolved or discarded because standard JSON has no equivalent syntax.

Comments are not data

YAML comments help readers but do not belong to the parsed value. JSON output cannot retain where a comment appeared or what it described.

Anchors are resolved

Aliases and merge keys may reduce repetition in YAML. The JSON result contains the resolved values rather than anchor names or alias syntax.

Map keys must become strings

JSON object keys are strings. YAML mappings that use complex values or non-string keys may be rejected or converted in a way that needs review.

Dates need deliberate quoting

Timestamp-like scalars can be interpreted differently by YAML tools. Quote date-shaped text when the exact string must survive conversion.

01Is my YAML uploaded?

No. Parsing, JSON generation, copying, and download preparation happen in your browser.

02Does the converter support multiple YAML documents?

Yes. Separate documents marked with --- are returned as elements of one JSON array.

03Which YAML version is supported?

The parser follows YAML 1.2 behavior, which avoids several surprising YAML 1.1 boolean conversions.

04Can every YAML feature be represented in JSON?

JSON has a smaller data model. YAML comments, anchors, tags, and formatting choices are not preserved in the JSON output.

05What happens to YAML anchors and aliases?

The parser resolves aliases to their underlying values. JSON receives the expanded data, but anchor names, aliases, and merge syntax are not preserved.

06Why did a YAML value change type?

Unquoted YAML scalars can represent strings, numbers, booleans, or null. Quote a value when it must remain text, especially identifiers with leading zeros or date-shaped strings.