YAML to JSON Converter

YAML ⇄ JSON Converter

Convert YAML to JSON and JSON to YAML instantly. Auto-detect, multi-document support, tree view, validation & formatting options. 100% private — runs in your browser.

Conversion options

JSON output

YAML output

Shared

Input

Detected: — Lines: 0 Chars: 0

Output

Format: — Lines: 0 Size: 0 B
Valid — converted successfully

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How to Use the YAML ⇄ JSON Converter

  1. Pick a direction. Choose YAML → JSON, JSON → YAML, or Auto-detect to let the tool figure out the input format.
  2. Paste or upload your data. Type directly, paste, or drop a .yaml, .yml or .json file onto the input box.
  3. Set output options. Adjust indentation, line width, quote style, block vs flow style, sort keys, and anchor expansion.
  4. Convert and export. The result appears instantly. Switch to Tree view to explore the structure, then copy or download the output.

What Is YAML and JSON?

JSON (JavaScript Object Notation) is a strict, brace-and-bracket data format used by virtually every web API and configuration system. It is compact and unambiguous but not the friendliest to write by hand. YAML (YAML Ain't Markup Language) is a human-friendly superset of JSON that uses indentation instead of braces, supports comments, multi-line strings, anchors and multiple documents in one file. It is the default for tools like Docker Compose, Kubernetes, GitHub Actions and Ansible.

Because YAML is a superset of JSON, every JSON document is already valid YAML, and any YAML document that contains only data (no functions or special tags) can be expressed as JSON. This converter parses your input with a full YAML 1.2 engine, builds the underlying data structure, then serializes it to the target format — preserving numbers, booleans, nulls, nested objects and arrays exactly.

Everything happens locally in your browser. Your configuration files, secrets and API payloads are never uploaded to a server.

Common Use Cases

⚙️ DevOps & CI/CDConvert Kubernetes, Docker Compose and GitHub Actions configs between formats.
🔌 API developmentTurn JSON API payloads into readable YAML and back again.
📝 Config editingRewrite settings files in whichever format your tool expects.
📖 OpenAPI / SwaggerSwitch specs between JSON and YAML for different editors.
🧪 DebuggingValidate and pretty-print messy YAML or JSON to spot errors fast.
🎓 LearningSee how the same data looks in both formats side by side.

Why Choose This Converter

  • Both directionsYAML to JSON and JSON to YAML, plus smart auto-detection.
  • Full YAML engineHandles anchors, multi-line strings, flow style and multiple documents.
  • Clear error messagesInvalid input shows the exact line and reason it failed.
  • Tree viewExplore the parsed structure with a collapsible tree.
  • Formatting controlIndent, line width, quotes, sort keys and block or flow style.
  • Private & freeNo sign-up, no upload — your data never leaves your device.

Frequently Asked Questions

Is my data uploaded to a server?
No. All parsing and conversion happen entirely in your browser using a local YAML engine. Your files and data are never sent anywhere, so it is safe for configs and secrets.
Does it support multi-document YAML?
Yes. If your YAML contains multiple documents separated by ---, they are parsed together and converted to a JSON array of documents.
Will comments be preserved?
JSON has no concept of comments, so when converting YAML to JSON, comments are dropped. When converting JSON to YAML, no comments are added. The data values themselves are always preserved exactly.
What is the difference between block and flow style?
Block style is the classic indented YAML layout that spans multiple lines. Flow style writes collections inline using brackets and braces, similar to JSON. Choose whichever your target tool prefers.
Why did my YAML fail to convert?
Usually it is an indentation or syntax issue — for example mixing tabs and spaces, or a missing colon. The error panel shows the line number and reason so you can fix it quickly.
Can I minify or pretty-print JSON?
Yes. Set the JSON indent option to Minified for the smallest output, or 2/4 spaces or Tab for a readable, pretty-printed result.

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