Why teams convert JSON to YAML
YAML is easier to read and edit than JSON: no braces, no trailing comma errors, and room for comments. That is why it became the standard for Kubernetes manifests, Docker Compose files, CI pipelines and many application configs.
This converter produces block-style YAML with two-space indentation. Long strings are kept on one line instead of being folded, and values that YAML would misread, such as strings that look like numbers or booleans, are quoted automatically.
JSON vs YAML at a glance
| Feature | JSON | YAML |
|---|---|---|
| Full name | JavaScript Object Notation | YAML Ain't Markup Language |
| Type | Hierarchical data | Hierarchical data |
| Introduced | Early 2000s (RFC 4627 in 2006) | 2001 |
| Created by | Douglas Crockford; now ECMA-404 and RFC 8259 | Clark Evans, Ingy döt Net and Oren Ben-Kiki |
| Structure | Nested objects and arrays | Maps and lists nested by indentation |
| Comments | No | Yes, with # |
| Data types | String, number, boolean, null, object, array | Strings, numbers, booleans, null, dates, lists, maps |
| Best for | APIs, web apps and app settings | Config files for Kubernetes, CI pipelines and Docker Compose |
| Support | Every programming language | Most languages through libraries |
| MIME type | application/json | application/yaml |
How to convert JSON to YAML
Step 1: Choose the JSON file
Drop a .json file onto the converter.
Step 2: YAML is preselected
Leave the output as YAML.
Step 3: Convert
The JSON is parsed and written as YAML with the original key order.
Step 4: Download
Save the .yaml file and add comments or edits as you like.
Output style
Block style
Maps and lists use indentation instead of braces and brackets.
No folding
Long strings stay on a single line.
Smart quoting
Strings like "true", "1.10", "on" or "NO" are quoted, so even older YAML 1.1 parsers read them as strings.
Order preserved
Keys appear in the same order as in the JSON.
Where JSON to YAML fits
Kubernetes manifests. Convert JSON output from kubectl or generators into editable YAML.
CI pipelines. Draft GitHub Actions or GitLab CI configs from JSON templates.
OpenAPI specs. Maintain API definitions in the more readable YAML form.
Human-edited settings. Give non-developers a config file that is easier to read.
Adding comments after converting
One of the main reasons to move to YAML is comments. JSON cannot contain them, so the converted file starts without any. Add # comments above keys to document why a setting exists; YAML parsers ignore them.
Keep indentation consistent when editing: two spaces per level, and never tab characters.
Types are kept exactly
Numbers stay numbers, booleans stay booleans and null becomes null. Strings that could be mistaken for another type are wrapped in quotes, which is what keeps a value like "yes" or "0123" a string when the YAML is read back.
Empty objects and arrays are written in flow style as {} and [], since block style has no way to show emptiness.
- "port": 8080 becomes port: 8080.
- "version": "1.10" becomes version: "1.10".
- "tags": [] becomes tags: [].
Tips for JSON to YAML
- Validate the YAML with your target tool, since each tool has its own schema.
- Keep the JSON source if it is generated; regenerate YAML rather than editing both.
- Use YAML to JSON to confirm the round trip gives the same data.
- Split very large configs into several files for readability.
JSON to YAML questions
What indentation is used?
Two spaces per level, the most common YAML convention.
Will long strings be wrapped?
No. Line folding is disabled, so each string stays on one line.
Is key order preserved?
Yes, keys appear in the same order as in the JSON.
Why are some strings quoted?
Quotes are added where YAML would otherwise read the value as a number, boolean or null.
Can the output have comments?
JSON has no comments to convert, but you can add them to the YAML afterwards.
Is my JSON uploaded?
No. Everything happens in your browser.