JSON to YAML Converter
Convert JSON objects and arrays to readable YAML online. Paste JSON or open a .json file, choose the indentation and formatting options supported by the page, then copy or download the YAML output for configuration, documentation, or development workflows.
Key Features
Readable YAML Output
Convert valid JSON objects and arrays into block-style YAML with indentation that makes nested configuration data easier to inspect and edit.
Copy or Download YAML
Copy the generated YAML to your clipboard or download it as a .yaml file for documentation, configuration work, testing, and version control.
Indentation Options
Choose the indentation option supported by the page. Consistent indentation improves readability, but the target platform's parser and schema remain the final authority.
Nested Objects and Arrays
Convert JSON objects into YAML mappings and arrays into YAML sequences while keeping the original nesting relationships represented in the output.
Readable Data Types
Represent JSON strings, numbers, booleans, and null values using YAML-compatible scalar forms. Review values that may be interpreted differently by a YAML 1.1 or YAML 1.2 parser.
Paste or Open JSON
Paste JSON directly into the editor or open a .json file from your device. The input is parsed and converted in the browser.
Browser-Based Processing
JSON parsing and YAML generation happen in your browser. The page does not require an account or upload the source JSON to a remote conversion service.
How to Use
Enter JSON
Paste a valid JSON object or array into the input editor or open a .json file. API responses, configuration data, and exported records can all be used as input.
Choose formatting options
Select the available indentation option and review any scalar or quoting settings provided by the interface.
Convert to YAML
Click Convert to YAML to generate a block-style YAML document. The converter maps JSON objects to YAML mappings and arrays to YAML sequences.
Review and export
Check indentation, strings, numbers, booleans, null values, and nested arrays before copying or downloading the YAML file.
{
"database": {
"host": "localhost",
"port": 5432,
"name": "myapp"
}
}database: host: localhost port: 5432 name: myapp
How to Convert JSON to YAML Online
What Is a JSON to YAML Converter?
A JSON to YAML converter parses a JSON object or array and emits the same general data structure using YAML syntax. YAML is often easier for people to read and edit because nesting is represented with indentation rather than braces, brackets, and commas.
JSON and YAML are related but not identical formats. JSON can be represented as YAML data, but converting JSON to YAML does not create comments, anchors, aliases, schemas, or platform-specific configuration behavior. The result still needs to be checked against the tool or platform that will read it.
Common Use Cases
- Configuration editing: Convert machine-generated JSON into a more readable YAML representation for human review.
- Kubernetes workflows: Use converted data as a starting point for a manifest, then validate it against Kubernetes resource schemas before applying it.
- Docker Compose: Convert structured configuration into YAML syntax for review or further editing when the resulting keys match the Compose specification.
- CI/CD files: Prepare JSON-generated configuration for a YAML-based pipeline, while still validating it with the target CI system.
- Documentation: Show nested configuration data in a concise YAML form.
- Local development: Convert API samples, generated configuration, or test fixtures into YAML for easier manual editing.
JSON vs YAML
- JSON: Strict punctuation-based syntax commonly used for APIs, application data, and machine-to-machine exchange.
- YAML: Indentation-based syntax commonly used for human-edited configuration and infrastructure tooling.
YAML can be more readable for configuration, but indentation and scalar interpretation become significant. A visually simple YAML file can still be invalid or interpreted differently by different parsers.
How to Convert JSON to YAML
- Enter JSON: Paste a valid JSON object or array or open a .json file.
- Choose indentation: Select the available indentation setting for the output.
- Convert: Generate the YAML representation of the JSON structure.
- Review scalar values: Check strings that resemble booleans, numbers, dates, null values, or YAML syntax.
- Copy or download: Copy the YAML or save it as a .yaml or .yml file.
- Validate for the target platform: If the file is for Kubernetes, Docker Compose, GitHub Actions, Helm, Ansible, or another system, run that platform's validation step before using it.
How JSON Structures Map to YAML
- Objects: Become YAML mappings using indented key-value pairs.
- Arrays: Become YAML sequences with a dash before each item.
- Strings: Become YAML scalars, with quotes added when needed to avoid ambiguous interpretation.
- Numbers: Are emitted as numeric-looking YAML scalars, subject to the target parser's rules.
- Booleans: Are emitted as YAML boolean values according to the serializer's output rules.
- Null: Is emitted using a YAML null representation rather than an empty string.
Why Quoting Matters in YAML
YAML parsers do not always interpret plain text the same way. Values such as true, false, null, date-like strings, numeric-looking strings, and YAML indicators may be interpreted as types rather than ordinary text. A serializer may add quotes to preserve the original JSON string value.
This is especially relevant when the output is consumed by tools using different YAML versions. YAML 1.1 and YAML 1.2 have different scalar rules, so test important values with the parser used by the destination platform.
JSON to YAML for Kubernetes
Kubernetes accepts YAML manifests and also accepts JSON representations for many resource definitions, so converting JSON to YAML is mainly useful for readability, editing, version control, and consistency with common Kubernetes workflows. The converter does not know whether fields such as apiVersion, kind, metadata, and spec are valid for a specific Kubernetes resource.
After conversion, validate the manifest with Kubernetes-aware tooling and remove server-managed fields when converting output from commands such as kubectl get -o json. A format conversion is not the same as producing a clean deployable manifest.
JSON to YAML for Docker Compose and CI/CD
Docker Compose and CI/CD platforms use YAML files, but each platform has its own schema and interpolation rules. A valid YAML document can still be rejected because a key is unsupported, a value has the wrong type, or the structure does not match the platform specification. Treat the generated YAML as a syntax conversion and validate it separately.
YAML Comments and Round Trips
JSON does not contain comments, so converting JSON to YAML cannot recreate comments that were not present in the source. Likewise, converting the generated YAML back to JSON will normally remove comments and formatting choices. Keep the original JSON and the edited YAML separately when comments or human-authored formatting matter.
URL Input and Security
Loading JSON from arbitrary URLs can introduce CORS, privacy, and security considerations. A browser may not be allowed to read a remote endpoint, and a remote response may contain data you did not intend to process. Local paste or file input is a more predictable default. If URL loading is added, validate the URL, handle CORS failures, and avoid sending credentials or private URLs from the page.
Browser-Based Privacy
This converter is designed to parse JSON and generate YAML in the browser instead of sending the source data to a remote conversion service. That can be useful for development and configuration work, but it is not a secret-management system. Avoid entering passwords, API keys, tokens, private customer data, or production credentials into any online tool.
Local Alternatives
For repeatable automation, CI pipelines, large files, or sensitive configuration, use a trusted local tool such as yq, a language-specific YAML library, or a project-specific formatter. Browser tools are most useful for quick transformations, inspection, and one-off edits.
