Is the JSON to YAML converter free to use?

Yes, the converter is completely free with no signup, no usage limits, and no hidden costs. You can convert as many JSON files to YAML as you need, anytime, directly in your browser.

Does the tool store or upload my data?

No. All conversion happens entirely client-side in your browser. Your JSON data never leaves your device or gets sent to any server. This makes it safe to use with sensitive data like API keys, credentials, or proprietary configuration files.

Can I customize the YAML output format?

Yes. The tool provides three options: indent size (2 or 4 spaces), flow level (controls when js-yaml switches from block style to inline flow style), and line width (controls where long lines are wrapped). These options let you match the output to your project’s style guide.

What YAML features are supported?

The converter uses the js-yaml library which implements YAML 1.2. It supports all core types: strings, numbers, booleans, null, arrays, objects, nested structures, and unicode. It also handles special characters in strings (quotes, colons, newlines) correctly. Anchors and aliases are disabled (noRefs: true) to produce clean, self-contained output.

Will the conversion lose any data?

No. The conversion is lossless for all JSON-compatible data types. JSON supports strings, numbers, booleans, null, arrays, and objects — all of which have direct YAML equivalents. The roundtrip JSON → YAML → JSON preserves the original data structure exactly.

Why would I convert JSON to YAML?

YAML is more readable and compact than JSON, supports comments, and is the standard format for Kubernetes manifests, CI/CD pipelines (GitHub Actions, GitLab CI), Docker Compose, Ansible playbooks, and many application configuration files. Converting JSON to YAML makes the data easier to read, edit, and maintain when human involvement is required.

What is the flow level option?

The flow level controls when js-yaml switches from block style (indentation-based, human-readable) to flow style (inline, JSON-like compact syntax). A flow level of -1 (default) means everything uses block style. A flow level of 0 means everything uses flow style. Higher values mean deeper nesting levels use block style before switching to flow.

Does the tool work on mobile devices?

Yes. The converter is fully responsive and works on phones, tablets, and desktops. On smaller screens, the input and output editors stack vertically. All features including conversion, copy, download, and options work on mobile devices.

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JSON to YAML

Convert JSON data to YAML format online.

What is YAML?

YAML (YAML Ain’t Markup Language) is a human-friendly data serialization format that has become the standard for configuration files in modern software development. Unlike JSON, which requires curly braces, quotes around every string, and commas between elements, YAML uses indentation and a minimal syntax that makes it dramatically more readable. This readability is why YAML has been adopted as the configuration language for Kubernetes, Docker Compose, GitHub Actions, GitLab CI, Ansible, and countless other tools.

YAML supports all the data types you need: strings, numbers, booleans, null values, arrays (sequences), and objects (mappings). It also includes advanced features that JSON lacks entirely — comments with#, multi-document files separated by---, anchors and aliases for content reuse, and a richer type system that includes dates, timestamps, and binary data. These features make YAML ideal for writing and maintaining configuration files by hand.

While JSON remains the dominant format for API responses and machine-to-machine data exchange, YAML is often preferred when humans need to read, write, or review the data. Converting between the two formats is a common task — you might receive an API response in JSON and need to create a YAML configuration from it, or you might have a YAML file that needs to be processed by a tool that only accepts JSON.

How to Convert JSON to YAML

Paste your JSONinto the input editor on the left. You can also click “Load Example” to try the tool with a sample Kubernetes Deployment manifest.
Adjust conversion options using the dropdowns in the action bar. Choose your preferred indent size (2 or 4 spaces), flow level (controls when block style switches to flow style), and line width (controls where long lines wrap).
Click Convertor simply let the auto-conversion run — the tool processes your input automatically with a 500ms debounce. The YAML output appears in the right-hand editor with syntax highlighting.
Review the output. If your JSON has syntax errors, the error panel will display a clear message explaining what went wrong. Fix the JSON and the output updates automatically.
Copy or downloadthe YAML using the buttons below the output editor. The downloaded file will be saved as “converted.yaml”.

JSON vs YAML

Both JSON and YAML are popular data serialization formats, but they have distinct strengths and are suited for different use cases:

Readability: YAML is significantly more compact and readable for humans. No braces, no mandatory quotes for simple strings, and no trailing commas. JSON is more verbose but unambiguous.
Comments: YAML supports inline comments with#, making it ideal for configuration files where documentation matters. JSON does not support comments at all.
Multi-document: YAML allows multiple documents in a single file using---separators. JSON requires an array wrapper or separate files.
Types: YAML supports a richer type system including dates, timestamps, binary data, and custom tags. JSON has only strings, numbers, booleans, null, arrays, and objects.
References: YAML supports anchors (&anchor) and aliases (*anchor) for reusing content. JSON has no equivalent — you must repeat data.
Parsing:JSON is trivial to parse safely. YAML’s flexibility (implicit typing, flow vs block styles) makes parsing more complex, which is why a reliable converter like this tool is valuable.
Use cases: JSON is the standard for APIs, data interchange, and programmatic use. YAML is preferred for configuration files (Kubernetes, CI/CD, Docker Compose, Ansible) where human readability is paramount.

Common Use Cases

Kubernetes manifests: Kubernetes resources are defined as YAML files. If you have resource definitions in JSON format (for example, from kubectl get -o json), convert them to YAML for easier editing and version control.
CI/CD pipelines: GitHub Actions, GitLab CI, and CircleCI all use YAML for pipeline definitions. Convert JSON representations of pipeline configs to YAML for direct use in your repository.
Docker Compose:Docker Compose files are written in YAML. If you’ve been working with container configurations in JSON, convert them to YAML for your docker-compose.yml.
Application configuration: Many frameworks (Spring Boot, Rails, Next.js) accept YAML configuration files. Convert JSON configs to YAML to add comments, reduce verbosity, and improve maintainability.
Ansible playbooks: Ansible uses YAML for its playbooks, roles, and inventory files. Convert JSON data structures to YAML when integrating with Ansible automation.
Data migration:When moving data between systems that use different formats — for example, migrating from a JSON-based config to a YAML-based one — a reliable converter ensures the data structure is preserved exactly.
Documentation: YAML is more pleasant to read in documentation and tutorials. Convert JSON examples to YAML when writing docs that will be read by humans.

Example

Here’s how a JSON object converts to clean, readable YAML:

JSON Input

YAML Output

Notice how YAML’s indentation-based syntax eliminates braces and quotes, producing a cleaner representation while preserving the exact same data structure.

Frequently Asked Questions