JSON to YAML & YAML to JSON Converter
Convert JSON to YAML or YAML to JSON instantly in your browser. Fast, 100% private bidirectional converter.
Features
- Bi-Directional Conversion: Easily switch between JSON to YAML and YAML to JSON with a single click.
- Full Data Type Support: Seamlessly handles nested objects, arrays, strings, numbers, booleans, and null values.
- YAML Comments & Multiline Strings: Parses YAML comments and preserves multiline block scalar formatting.
- 100% Client-Side Privacy: All parsing runs locally inside your browser runtime. Sensitive configuration data is never transmitted to our servers.
- 1-Click Export & Download: Instant clipboard copy with feedback and one-click file download for
.yamland.jsonfiles.
How it works
JSON (JavaScript Object Notation) and YAML (YAML Ain't Markup Language) are the two most popular data serialization formats in modern software engineering. While JSON relies on explicit braces ({}), brackets ([]), and quotes for strict machine parsing, YAML relies on indentation and clean syntax for human readability.
To use this converter:
- Select your desired mode: JSON → YAML or YAML → JSON.
- Type or paste your configuration payload into the left input pane, or click Sample to load an example template.
- Click Convert to parse and format the output into the right pane.
- Use Swap to invert the conversion direction and immediately transform the output back.
Configuration review with JSON and YAML
Use this converter when moving structured configuration between an API-friendly JSON representation and a human-edited YAML file. A practical example is reviewing a small Kubernetes or CI configuration in YAML, then converting it to JSON for a programmatic test.
Limit: YAML supports features that do not map cleanly to JSON, including comments, anchors, tags, and some scalar representations. Always run the converted file through the target application's own parser and schema checks.
How to Convert Between JSON and YAML
Converting data between JSON and YAML requires understanding the structural mapping between the two formats. Every valid JSON document can be represented as valid YAML, but YAML supports additional syntax features such as anchor references, multi-document streams, and comments.
JSON → YAML Rules
- Curly braces
{}become indentation-based key-value pairs. - Square brackets
[]become hyphen-prefixed list items (- item). - Quotes around keys are omitted unless the key contains special characters or colons.
YAML → JSON Rules
- Indentation levels are converted to nested objects with explicit closing braces.
- List items are collected into standard comma-separated JSON arrays.
- All property names are strictly enclosed in double quotes as required by RFC 8259.
JSON vs YAML Syntax Comparison
Compare the exact same data structure represented in both formats:
{
"service": "api-gateway",
"port": 8080,
"enabled": true,
"endpoints": [
"/health",
"/v1/users"
]
}# Microservice Configuration service: api-gateway port: 8080 enabled: true endpoints: - /health - /v1/users
When Developers Convert JSON and YAML
Kubernetes Manifests & Helm Charts
Kubernetes resources (Deployments, Services, ConfigMaps) are authored in YAML for readability, but Kubernetes API servers output resource definitions in JSON when queried with kubectl get -o json.
CI/CD Pipeline Configurations
GitHub Actions, GitLab CI, and CircleCI pipelines define workflows in YAML. Converting payload JSON data from webhooks or API triggers into pipeline YAML steps is a frequent developer task.
Docker Compose & Container Specs
Docker Compose files use YAML syntax for service definitions and environment variables. Developers convert JSON cloud provider templates into local Compose files.
OpenAPI & Swagger Specifications
REST API contracts in OpenAPI can be authored in either YAML or JSON. Converting between them allows documentation tools and code generators to accept their preferred input format.
Your Data Stays in Your Browser
Config files frequently contain sensitive environment keys, internal hostnames, and database schemas. DevToolkit processes all JSON and YAML conversions entirely in your browser using WebAssembly and native JavaScript. We never upload, log, or inspect your data.
Related Developer Tools & Guides
JSON Formatter
Format, beautify, and minify your JSON payloads with Monaco Editor syntax highlighting.
JSON Validator
Catch syntax errors, trailing commas, and unescaped quotes before converting to YAML.
JSON ↔ XML Converter
Convert JSON payloads directly to structured XML or parse XML tags into clean JSON.
JSON ↔ CSV Converter
Use the JSON to CSV converter for tabular exports, or parse CSV files into clean JSON objects.
JSON vs XML
Compare syntax, data types, parsing speeds, and architectural use cases.
What is JSON?
A complete guide to JSON data types, syntax rules, and error troubleshooting.
Frequently Asked Questions
Can I convert YAML with comments to JSON?
Yes! When converting YAML to JSON, the parser safely processes comments without throwing syntax errors. However, because standard JSON specification does not support comments, comments cannot be preserved in the resulting JSON output.
Does my configuration or secret key leave my machine?
No. All conversions happen entirely in your browser using client-side JavaScript. DevToolkit never transmits, logs, or stores your configuration files or sensitive credentials.
How are null values represented in YAML?
In YAML, null values can be represented as `null`, `~`, or simply an empty value after a key. When converting from JSON to YAML, null values are output as standard `null`.
Why does my YAML conversion fail?
The most common YAML parsing issue is incorrect indentation. YAML strictly forbids tab characters (`\t`) for indentation; it requires spaces (typically 2 spaces per indentation level). Ensure all nested elements are aligned with spaces.