JSON ↔ YAML Converter
Convert JSON and YAML 1.2 core data with explicit directions, bounded alias expansion and rejection of values that would lose precision.
About this json ↔ yaml converter
Convert JSON and YAML 1.2 core data with explicit directions, bounded alias expansion and rejection of values that would lose precision Transforms and validates developer data structures locally, preventing confidential payload exposure during data wrangling.
Syntax parsing & data transformation logic
Converts JSON-compatible data between JSON and YAML 1.2 core schema. Objects, arrays, strings, booleans, null and supported numbers retain their values and types. YAML mapping keys must be strings. Earlier anchors and acyclic aliases are expanded into ordinary JSON data. Plain dates stay strings; the key << is literal, without merge-key behavior.
Worked conversion & output example
Scenario: Load the sample or enter a JSON object containing name and items.
Sample input:
Processing:
Illustrative output:
Syntax constraints & input size limits
Input is limited to 1,000,000 UTF-16 code units, output to 8,388,608, and nesting to 100 collection levels, including alias expansion. Empty input and invalid Unicode are rejected. Numbers must be finite without decimal precision loss or underflow; integers must be within ±9,007,199,254,740,991. Negative zero is rejected. Quote exact large or high-precision values as strings. Duplicate keys, non-string YAML keys, alias cycles or forward references, multiple documents, YAML 1.1 and non-core tags such as timestamps or binary data are rejected. Comments, formatting, anchor names and key order are not preserved. No file upload or download is offered.
Data conversions and formatting in JSON ↔ YAML Converter reflect standard structured syntax. Verify parsed outputs against your target runtime before deployment.
Local client execution boundary
Data parsing and transformations in JSON ↔ YAML Converter execute in the local browser tab without remote data transmission.
Data format specifications & language standards
Data interchange formats and language grammar specifications:
JSON ↔ YAML Converter verification · Audit standards
How to use it
- Enter, paste, or select your input data into the JSON ↔ YAML Converter workspace controls.
- Choose JSON → YAML and Run locally.
- Check the YAML values, copy the complete output, and use YAML → JSON to convert it back.
Frequently asked questions
How do I explicitly convert JSON to YAML in this page?+
Select JSON to YAML, paste a JSON document, and choose Run locally. For `{ "name":"Ada", "active":true }`, the output is `name: Ada` followed by `active: true`.
What does Auto direction mean for JSON and YAML input?+
Auto attempts a supported interchange direction from the text. Select a direction explicitly whenever a document could be interpreted ambiguously or when a repeatable workflow matters.
Which YAML features are not a lossless JSON round trip?+
JSON has no comments, aliases, tags, duplicate mapping keys, or non-string object keys. Do not expect conversion to preserve such YAML-specific syntax as semantic JSON data.
Where does JSON ↔ YAML conversion run, and what limits apply?+
Conversion runs as browser text processing. Inputs must be valid Unicode and accepted interchange structures; large or deeply nested documents are bounded, and ordinary site requests are separate.