JSON to YAML Converter with Instant Validation
Paste JSON or open a .json file to create clean YAML in your browser. Find syntax errors, format the source, control indentation, and copy or download the result without uploading your data.
How to convert JSON to YAML online
Paste structured JSON, choose readable YAML settings, then copy the result or save it as a .yaml file.
Paste or upload JSON
Enter JSON in the left editor or open a .json file up to 5 MB. Use Format to make the source easier to review.
Choose YAML settings
Select two-space or four-space indentation and optionally sort object keys alphabetically.
Copy or download YAML
The YAML updates automatically. Copy the output or download it as a reusable .yaml file.
JSON to YAML converter settings
Adjust indentation and key ordering while preserving JSON objects, arrays, strings, numbers, booleans and null values.
| Control | Setting | Effect |
|---|---|---|
| JSON validation | Strict JSON.parse | Reports malformed objects, arrays, strings and other syntax errors before conversion |
| Indentation | 2 or 4 spaces | Controls YAML nesting without using tab characters |
| Key order | Preserve or sort | Keeps original object order or sorts keys for predictable output |
| Output | Copy or .yaml download | Moves the result into an editor, repository or configuration workflow |
JSON vs YAML configuration formats
Both formats represent structured data, but their syntax and common development workflows differ.
| Characteristic | Source | Output |
|---|---|---|
| Syntax | Braces, brackets, commas and quoted keys | Indentation, mappings and sequences |
| Comments | Not supported by standard JSON | Supported with #, though JSON input contains none to preserve |
| Data types | Objects, arrays, strings, numbers, booleans and null | Mappings, sequences, scalars and null values |
| Common use | APIs, web payloads and application data | Configuration, CI/CD, Kubernetes and documentation |
| Whitespace | Usually insignificant | Indentation defines nested structure |
What happens when JSON is converted to YAML
The converter parses valid JSON into data values, then serializes those values with safe YAML syntax.
Invalid JSON is stopped before conversion
Trailing commas, single-quoted strings, comments and missing delimiters are rejected because they are not valid standard JSON.
Objects and arrays become YAML collections
JSON objects become YAML mappings, while arrays become sequences. Nested structures and primitive values retain their meaning.
Ambiguous strings are quoted safely
The YAML serializer quotes values when needed so strings such as dates, booleans or numeric-looking identifiers are not misinterpreted.
Comments cannot be recovered
Standard JSON has no comments, so conversion cannot create source comments or documentation that was not present in the parsed data.
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JSON to YAML converter FAQ
How do I convert JSON to YAML?
Paste JSON into the left editor or upload a .json file, then choose indentation and key ordering. The YAML updates automatically and is ready to copy or download.
Is this JSON to YAML converter free?
Yes. You can validate, format and convert JSON without payment, registration or a usage credit.
Is my JSON uploaded to a server?
No. JSON parsing and YAML serialization run locally in your browser, so configuration data and API payloads do not leave your device.
Can the converter detect invalid JSON?
Yes. Invalid JSON is rejected with the parser error message. Common problems include trailing commas, comments, single quotes and missing braces or quotation marks.
Does JSON to YAML conversion preserve arrays and nested objects?
Yes. JSON arrays become YAML sequences and nested objects become mappings, while strings, numbers, booleans and null values retain their data types.
Can I convert a JSON file to a YAML file?
Yes. Open a .json file up to 5 MB, convert it locally and select Download to save the output as converted.yaml.
Should YAML use two or four spaces?
Both are valid when used consistently. Two spaces are common in compact configuration files, while four spaces may be easier to scan in deeply nested data.
Does the converter support JSON comments or trailing commas?
No. Those features are not part of standard JSON. Remove comments and trailing commas or convert the source from JSON5 before using this tool.
Can I convert JSON to YAML for Kubernetes?
Yes. The output is valid YAML data, but you must still provide the Kubernetes-specific apiVersion, kind, metadata and spec fields required by the resource.
What is the difference between .yaml and .yml?
Both extensions represent YAML files and contain the same syntax. The official recommendation is .yaml, while .yml remains common in tools such as Docker Compose and CI systems.
Convert JSON data to YAML
Validate structured JSON and create readable YAML locally, ready to copy or download.
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