JSON to YAML

What Is JSON to YAML Conversion?

JSON (JavaScript Object Notation) and YAML (YAML Ain't Markup Language) are both human-readable data serialization formats. YAML is a superset of JSON — every valid JSON document is also valid YAML. Converting JSON to YAML produces a cleaner, more readable output without braces, brackets, or excessive punctuation, making it the preferred format for configuration files (Kubernetes, Docker Compose, GitHub Actions, Ansible).

How to Convert JSON to YAML

1. Paste your JSON into the Input pane on the left, or click Upload to load a .json file.
2. Click Convert — the YAML output appears instantly in the right pane.
3. Choose Indent: 2 spaces (default) or 4 spaces.
4. Toggle Flow Arrays to render short arrays on a single line: [a, b, c].
5. Toggle Quote Strings to force double-quotes around all string values.
6. Click Copy to copy the YAML, or Download to save as output.yaml.
7. Use Explain with AI to get a plain-English breakdown of the data structure.

YAML Syntax Rules

• Indentation defines structure — spaces only, no tabs allowed.
• Key-value pairs use key: value syntax.
• Strings usually don't need quotes unless they contain special characters (: # { } [ ] , & * ? | - < > = ! % @ \).
• Arrays use a dash-prefix for each item: - item.
• Booleans are true / false (lowercase).
• Null is represented as ~ or the word null.
• Multi-line strings use | (literal) or > (folded) block scalars.

Common Use Cases

• Kubernetes manifests — most cluster configs are YAML. Convert JSON exports from kubectl or API responses to YAML for editing.
• GitHub Actions workflows — .github/workflows/*.yml files are YAML. Convert from JSON build configs.
• Ansible playbooks — YAML is the standard format. Convert structured data dumps to playbook-compatible YAML.
• Docker Compose — compose.yaml services are easier to read than equivalent JSON.
• Tool migration — moving from a JSON-config tool to a YAML-config tool (e.g. package.json Prettier config to .prettierrc.yaml).
• Readability for team review — YAML is less visually noisy for non-developer stakeholders.

JSON vs YAML — Which to Use?

Use JSON for machine-to-machine communication: APIs, message queues, serialised data. It's stricter, faster to parse, and supported everywhere. Use YAML for human-edited configuration: CI workflows, Kubernetes manifests, application settings. It allows comments (JSON doesn't) and is more readable. For pure data interchange, JSON wins; for configuration, YAML wins.

Tips & Tricks

• Indentation matters in YAML — spaces only, never tabs. This tool defaults to 2-space indent, the most common convention.
• Flow Arrays for short lists — enable to render ["dev", "prod"] on one line instead of expanded multi-line.
• Quote strings only when needed — YAML auto-detects types, but some strings (yes, no, on, numbers) need quotes to stay strings. Enable Quote Strings if you need consistent string handling.
• YAML supports comments — once converted, add # comments to the YAML for human readers. JSON does not allow comments at all.
• Validate the output — paste back into a YAML linter (e.g. yamllint) to verify the conversion preserved structure.

Related Tools

• JSON Formatter — Format your source JSON before converting.
• JSON Validator — Verify the source JSON is valid before conversion.
• JSON to XML — Convert to XML for legacy APIs that require it.
• JSON to CSV — Flatten JSON arrays to CSV for spreadsheets.
• JSON to SQL — Generate INSERT statements from JSON arrays.

Is My Data Sent to a Server?

No. All conversion runs entirely in your browser using the js-yaml library. Your JSON data never leaves your machine. The AI Explain feature only sends the text you explicitly submit for explanation; otherwise nothing is transmitted.