YAML ↔ JSON Converter
Convert between YAML and JSON with validation, swap panels, and one-click copy. Parsing stays local — nothing is uploaded.
What is a YAML to JSON converter?
What this tool does
This tool converts between YAML and JSON in both directions with syntax validation. Choose YAML → JSON or JSON → YAML, paste into the left panel, and read the converted result on the right. Invalid input triggers a clear status-bar error instead of silent garbage output. Swap flips the panels so you can chain conversions without re-pasting. A sample loader helps you verify the workflow before pasting production config.
Why you need it
YAML dominates Kubernetes manifests, CI pipelines, and Ansible playbooks, while JSON is the lingua franca of REST APIs and browser-native data. Moving config between those worlds by hand is slow and error-prone—indentation rules differ, and a single tab can break a YAML file. A validated converter lets you prototype API payloads from existing YAML configs, or turn JSON responses into readable YAML for documentation. Because parsing runs locally, secrets in your config never leave the browser. DevOps engineers, backend developers, and technical writers all hit this boundary when tooling expects a different format than the one stored in Git. Quick conversion with immediate validation beats guessing whether your paste introduced a subtle syntax error.
How to use it
- Select YAML → JSON or JSON → YAML with the mode buttons in the toolbar.
- Paste your source text into the left panel, or click Load sample to see a working example.
- Click Convert. Valid output appears on the right; errors show in the status bar.
- Copy the result, or click Swap to flip panels and convert back.
- Clear both panels when done — your config is never stored on Kitnax servers.
Practical examples
- Turn a Kubernetes Deployment manifest into JSON for an API integration test.
- Convert a JSON API schema into YAML for a GitOps repository.
- Validate a CI snippet before committing it to
.github/workflows. - Format the JSON output further with the JSON Formatter for readable diffs.
- Translate a docker-compose service block to JSON for a monitoring dashboard import.
How it works
YAML and JSON represent the same abstract data—objects, arrays, strings, numbers, booleans, and null—but with different syntax. YAML uses indentation and optional quotes; JSON is stricter and always uses double-quoted keys and strings. The converter parses the source format into a JavaScript object tree, then serializes it to the target format. Anchors and aliases in YAML resolve during parsing; some advanced YAML tags may not survive a round trip because JSON has no equivalent. Multi-line strings and nested mappings translate cleanly when indentation is consistent. All processing uses client-side libraries—nothing is sent to a Kitnax server, so database URLs, API keys, and internal hostnames in your config stay private. The status bar reports parse errors immediately so you can fix the source before copying output into production systems.
Common mistakes
- Mixing tabs and spaces in YAML; YAML requires consistent space indentation.
- Expecting comments to appear in JSON output—JSON has no comment syntax.
- Assuming every YAML feature round-trips perfectly; custom tags and binary nodes may lose meaning.
- Pasting JSON with trailing commas or single quotes; strict JSON parsing will reject it.
- Converting YAML with merge keys or custom tags and expecting identical YAML after a round trip through JSON.
FAQ
Which direction can I convert?
Both ways: YAML to JSON and JSON to YAML. Use Swap to flip panels after a conversion.
Does it validate input?
Yes. Invalid YAML or JSON shows a short error in the status bar and clears the output.
Is my data uploaded?
No. Parsing and conversion run entirely in your browser.
What YAML features are supported?
Standard YAML 1.2 constructs: mappings, sequences, anchors, and multi-line strings. Custom tags or binary blobs may not round-trip cleanly.
Why does my YAML fail to parse?
Common causes are inconsistent indentation, tabs instead of spaces, unquoted special characters, or duplicate keys. Check the status bar message for the line hint.