Convert between JSON and YAML formats instantly
JSON→YAML and YAML→JSON
Checks syntax before converting
Pretty-prints output
All processing in browser
JSON (JavaScript Object Notation) is a lightweight data-interchange format using key-value pairs: {"name": "John", "age": 30}. It's strict about syntax - requires double quotes for keys and strings, no trailing commas, and no comments.
YAML (YAML Ain't Markup Language) is a human-readable data serialization format using indentation: name: John. It supports comments with #, multi-line strings, and is the standard for configuration files in Kubernetes, Docker, and CI/CD systems.
Yes! JSON is a subset of YAML 1.2. Any valid JSON document is automatically valid YAML. YAML parsers can read JSON natively, making conversion straightforward in either direction.
Not exactly, but they're related. YAML is a superset of JSON with more human-friendly syntax. YAML uses indentation instead of braces, supports comments, and allows unquoted strings. JSON is stricter but more universally supported.
For most data, yes. You can convert between them freely. However, YAML-specific features like comments (#) and anchors (&) are lost when converting to JSON since JSON doesn't support them.
Paste your JSON in the input field above, ensure "JSON → YAML" mode is selected, and click Convert. The tool validates syntax and produces properly indented YAML output that you can copy with one click.
Click the "YAML → JSON" tab, paste your YAML content, and click Convert. The converter parses your YAML and outputs valid, formatted JSON ready to copy and use in your applications.
Use PyYAML: import yaml, json; yaml.dump(json.loads(json_string)). Or use this online converter for quick one-off conversions without writing code or installing packages.
Install the "YAML to JSON" extension from VS Code marketplace. Open your file, use Command Palette (Ctrl+Shift+P), and search for "Convert". Or paste content here for instant browser-based conversion.
Use yq: yq -o json file.yaml. Or with Python: python -c "import yaml,json,sys; print(json.dumps(yaml.safe_load(sys.stdin)))" < file.yaml. This online tool works on any OS without installation.
Paste your Swagger or OpenAPI JSON specification here and convert to YAML. The structure is fully preserved. Many teams prefer YAML for API specs due to better readability and comment support.
YAML is more readable for humans, supports comments for documentation, and requires less syntax (no quotes or braces). It's the standard for Kubernetes manifests, Docker Compose, Ansible playbooks, and GitHub Actions workflows.
JSON has broader language support, is faster to parse, and has stricter syntax that prevents ambiguity. It's the standard for REST APIs, package.json, and data interchange between different systems and languages.
Critics cite: whitespace sensitivity causing subtle bugs, implicit type coercion (the "Norway problem" where 'NO' becomes boolean false), and complexity of advanced features like anchors. For simple configs, these rarely cause issues.
YAML offers: comments for inline documentation, cleaner syntax without braces/quotes, multi-line string support with | and >, anchors (&) and aliases (*) for DRY configs, and generally better readability for configuration files.
Unlikely. Each serves different purposes: YAML dominates configuration (Kubernetes, Docker, CI/CD), while JSON dominates APIs and data exchange. Both will continue to coexist, and this converter helps bridge them.
YAML 1.2 specification explicitly includes JSON as a subset. Any JSON document is automatically valid YAML. YAML then adds: comments, relaxed quoting, multi-line strings, anchors/aliases, and multiple documents in one file.
Install the "YAML" or "JSON to YAML Converter" plugin from JetBrains Marketplace. Right-click your JSON file and select Convert, or use keyboard shortcuts. This online tool works for quick conversions outside your IDE.
Use the js-yaml library: JSON.stringify(jsyaml.load(yamlString)). This converter uses the same library client-side, so conversions happen instantly in your browser with zero server calls.
jq doesn't natively output YAML, but you can pipe to yq: cat file.json | yq -P. Or use this online converter which handles both formats without installing command-line tools.
Use: yq -o json file.yaml. The yq tool (a YAML processor like jq) supports JSON output natively. For quick conversions without installing tools, use this browser-based converter.
No, JSON doesn't support comments. When converting YAML to JSON, all comments (# lines) are stripped. If you need to preserve documentation, keep a YAML source file as your "source of truth" alongside generated JSON.
Yes! Since JSON is valid YAML, you can use JSON's flow style syntax inline: key: {"nested": "value"}. This is useful for compact inline data within readable YAML configs.
Yes! Completely free with no registration, no limits, and no ads. All conversion happens in your browser using JavaScript - your data never leaves your device. Works offline once the page loads.
Yes! Once loaded, all conversion happens locally in your browser. No server requests are made during conversion. You can convert JSON and YAML even without an internet connection.