JSON to YAML Converter Free
Convert JSON to YAML configuration format instantly. Paste JSON, choose indent style, preview the YAML output, then copy or download. Powered by js-yaml — supports all YAML 1.2 features. Runs entirely in your browser.
JSON Input
YAML Output
Pro — batch JSON files, schema validation, YAML anchors output, API access
API access · Priority queue · Team workspace
How It Works
Paste Your JSON
Paste any valid JSON — objects, arrays, nested structures, numbers, booleans, or null values. Click Sample JSON to load a complete configuration object representing a typical application config with database settings, feature flags, logging levels, and server options. The converter handles any depth of nesting.
Set Options & Convert
Choose 2-space or 4-space indentation to match your project's style guide. Enable Sort Keys to produce deterministic, alphabetically ordered YAML that's easy to diff in version control. Enable Flow Style to write compact inline arrays and objects on one line instead of block style. Then click Convert for instant output.
Copy or Download
Copy the YAML to your clipboard with one click to paste into a config file, CI pipeline, or Kubernetes manifest. Or download as a .yaml file ready to drop into your project. The output is compatible with all major YAML parsers including PyYAML, js-yaml, SnakeYAML, go-yaml, and Ruby's Psych library.
JSON to YAML Features
Professional YAML generation powered by js-yaml in your browser
Full Type Preservation
JSON types map cleanly to YAML types — strings stay strings, numbers stay numbers, booleans become true/false without quotes, and null becomes null (not the string "null"). Multi-line strings are automatically rendered as block scalars using the pipe (|) operator, preserving line breaks in YAML's most readable format.
Flexible Indentation
Choose 2-space indentation for compact config files (common in JavaScript and Node.js projects) or 4-space indentation for more readable output (preferred in Python and Go projects). The indent setting applies consistently at every nesting level, producing YAML that matches your existing codebase style without manual reformatting.
Sort Keys for Diffs
Enable Sort Keys to produce alphabetically ordered YAML output. This is invaluable for configuration files stored in version control — when two team members convert the same JSON data, sorted keys guarantee identical output, making git diffs clean and easy to review. It also makes it easier to find specific keys in large config files.
Flow Style Option
Flow style renders arrays as [a, b, c] and objects as {key: value} on a single line instead of the default block style. This is useful for short arrays like tags or IDs where the compact representation is more readable. Block style (default) is better for deeply nested configs that need to be scanned quickly.
Wide Parser Compatibility
Output is generated by js-yaml, the most widely used JavaScript YAML library with billions of monthly downloads. The resulting YAML is compatible with PyYAML, SnakeYAML (Java), go-yaml, Ruby Psych, and all YAML 1.1/1.2 parsers. No proprietary extensions or non-standard features — just clean, portable YAML your tools can consume immediately.
100% Private
The conversion runs entirely in your browser. Your JSON — including API keys, database connection strings, environment variables, and application secrets that frequently appear in config files — is never transmitted to any server, never logged, and never stored. Close the browser tab and all data is gone. Safe for internal, confidential, or production configurations.
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| JSON input size | Unlimited | Unlimited |
| Batch JSON files | — | |
| YAML anchor output | — | |
| Schema validation | — | |
| Scheduled conversions | — | |
| REST API access | — |
Frequently Asked Questions
Yes — YAML 1.2 is a strict superset of JSON, meaning every valid JSON document is also valid YAML. This is why JSON-to-YAML conversion is always possible without data loss. The reverse (YAML to JSON) is not always possible because YAML supports features JSON doesn't — like comments, anchors, aliases, multi-document streams, and non-string keys.
JSON null becomes YAML null (or equivalently a tilde ~). JSON true and false become unquoted YAML true and false. These map cleanly to the correct YAML scalar types — they are not wrapped in quotes. Numbers are also preserved as-is without quotes, maintaining the correct type in the output YAML.
Yes — js-yaml is smart about quoting ambiguous strings. A JSON string value of "42" will be output as '42' (single-quoted) in YAML to prevent parsers from interpreting it as a number. Similarly, strings like "true", "null", or "yes" that are YAML keywords will be quoted to preserve their string type.
Yes — the output YAML is standard YAML 1.2 that works with kubectl, Helm, Docker Compose, GitHub Actions, and any other tool that consumes YAML. Note that you may need to wrap the output in the appropriate root key for the target format (e.g., a Kubernetes Deployment requires specific top-level keys like apiVersion, kind, and spec), but the converter handles the JSON-to-YAML translation correctly.
Block style uses newlines and indentation to represent structure — arrays start with a dash and each item is on its own line. Flow style uses curly braces and square brackets like JSON. Block style is more readable for complex structures; flow style is more compact for short arrays and simple objects. You can mix them — the flow style option here applies at the root level and cascades down.
No — all conversion happens locally using the js-yaml library loaded from a CDN. Your JSON never leaves your browser tab. No analytics on your data content, no server-side processing, no logs. This makes it safe to convert JSON configuration files that contain database passwords, API tokens, private keys, or any other secrets that should not be transmitted over the internet.