JSON to YAML Converter
Convert JSON data to clean, readable YAML format instantly in your browser.
JSON to YAML Features
Clean, readable YAML output from any valid JSON.
Clean YAML indented with 2 spaces.
Strings, numbers, booleans, null, arrays, and objects all convert.
Works with Kubernetes, Docker Compose, GitHub Actions.
Key Takeaways
- Conversion runs entirely in your browser using the native JSON parser and a YAML library, so your data is processed on your device.
- Input must be strict JSON with double-quoted keys, no trailing commas, and no comments, or the converter rejects it with the exact error position or reason.
- Output is clean block-style YAML with two-space indentation, ready to paste into Kubernetes manifests, GitHub Actions or GitLab CI pipelines, Docker Compose files, and Ansible playbooks.
- Values like yes, no, on, off, or text resembling numbers are quoted automatically to preserve their string meaning, and since JSON has no comments none carry into the YAML.
How to Convert JSON to YAML in Your Browser
Paste valid JSON into the input
Drop your JSON object or array into the JSON Input box. The converter parses it with the browser's native JSON parser, so the text must be strict JSON: double-quoted keys, no trailing commas, and no comments. If parsing fails, the input is highlighted and the exact error message is shown.
Click Convert to YAML
The tool generates clean block-style YAML using two-space indentation. Strings, numbers, booleans, null, nested objects, and arrays are all mapped to their YAML equivalents. Conversion runs entirely on your device, so nothing is uploaded.
Copy or reuse the output
Use Copy YAML to place the result on your clipboard, then paste it into a config file, a Kubernetes manifest, or a CI pipeline. Click Clear to reset both panes and start a new conversion.
How JSON Types Map to YAML
YAML is a superset of JSON, so every valid JSON value has a direct YAML representation. The table below shows how each JSON type appears in the converted output produced by this tool.
| JSON value | Example input | YAML output |
|---|---|---|
| Object | {"host": "db"} | host: db (key and value on one line) |
| Array | ["a", "b"] | Dash list, one item per line with a leading hyphen |
| String | "hello" | hello, quoted only when needed for safety |
| Number | 3.14 | 3.14, written as a bare scalar |
| Boolean | true | true, lowercase literal |
| Null | null | null, the YAML null scalar |
When JSON to YAML Conversion Helps
Kubernetes manifests
Many tools and APIs emit JSON, but Kubernetes manifests are usually authored in YAML. Convert the JSON to YAML to get a manifest that is easier to read, comment, and review in pull requests.
CI/CD pipelines
GitHub Actions, GitLab CI, and similar systems use YAML configuration. If you hold pipeline settings as JSON in code, this converter gives you a clean YAML version to paste into the workflow file.
Docker Compose and Ansible
Compose files and Ansible playbooks are YAML based. Turning generated JSON into YAML lets you reuse existing data structures in these infrastructure-as-code tools without retyping them.
Readable config for humans
YAML drops the braces and commas that make nested JSON hard to scan. Convert when you want a configuration format that is friendlier to read and edit by hand.
Common Problems and Fixes
Invalid JSON error
The converter uses strict JSON parsing. Remove trailing commas, replace single quotes with double quotes, quote every object key, and delete any comments. The status message names the position or reason the parser rejected the input.
Output is missing comments
JSON has no comment syntax, so there are no comments to carry over into the YAML. Add any explanatory comments to the YAML output yourself after conversion, using the hash character.
Strings appear quoted in the YAML
Values such as yes, no, on, off, or text that looks like a number are quoted automatically so they keep their original string meaning. This is correct behavior and prevents YAML from reinterpreting them as booleans or numbers.
Nothing happens or library not loaded
Conversion needs the YAML library to finish loading. If you see a message that the library is not loaded, check your connection and reload the page, then click Convert again.
About JSON to YAML Converter
Convert JSON data to YAML format for use in configuration files, CI/CD pipelines, and infrastructure-as-code.
Frequently Asked Questions
Is this tool free to use?
Yes, this tool is completely free.
No account or registration is required.
You can use it as many times as you like.
Is my data private?
Browser-side workflows run locally.
Your data is never sent to any server.
We do not store, log, or share your input.
Does it work on mobile?
Yes, the tool is fully responsive.
It works on phones, tablets, and desktops.
No app download is needed.
Do I need to install anything?
No installation is required.
It runs entirely in your web browser.
Works on any modern browser without plugins.
Is there a file size limit?
There is no strict file size limit.
Very large inputs may be limited by browser memory.
For best performance, keep inputs under a few MB.
Can I use the output commercially?
Yes, there are no restrictions on usage.
The output belongs entirely to you.
Use it for personal or commercial projects freely.
What browsers are supported?
All modern browsers are supported.
This includes Chrome, Firefox, Safari, and Edge.
Keep your browser updated for best results.
How accurate is the result?
Results are highly accurate for standard inputs.
Edge cases may produce unexpected output.
Always review the output before using it in production.
Sources and References
Format and tool details on this page are based on the official specifications and documentation below.
- RFC 8259: The JSON Data Interchange Format- IETF
- JSON- MDN Web Docs
- YAML 1.2 Specification- yaml.org