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
Lossless conversion between Kubernetes manifests, CI/CD pipelines, and JSON.
How this tool works
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.
- Load the sample or enter a JSON object containing name and items.
- Choose JSON → YAML and Run locally.
- Check the YAML values, copy the complete output, and use YAML → JSON to convert it back.
Worked example
Scenario: Load the sample or enter a JSON object containing name and items.
Sample input:
Processing: 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.
Illustrative output:
Limits and verification
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.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Load the sample or enter a JSON object containing name and items.
- 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.