JSON to YAML / YAML to JSON Converter
Instantly convert between JSON and YAML formats — right in your browser. No server, no tracking, no sign-up required. Whether you're migrating configuration files, debugging Kubernetes manifests, or converting API responses for use in a CI/CD pipeline, this tool handles it all in milliseconds.
The conversion logic is written entirely in plain JavaScript with no external libraries — giving you complete transparency and privacy over your data.
How to Use This Tool
- Choose a direction — Select either JSON → YAML or YAML → JSON using the toggle at the top of the tool.
- Paste or load your input — Paste your JSON or YAML data into the left panel, or click Load Sample to see an example right away.
- Click Convert — The converted output appears instantly in the right panel. Any syntax errors are highlighted with a clear message.
- Copy or Download — Use Copy to put the result in your clipboard, or Download to save the output as a
.yamlor.jsonfile.
Key Benefits
- ✓ Bi-directional conversion: Switch between JSON→YAML and YAML→JSON in a single click — no need for separate tools.
- ✓ 100% private: All parsing and serialisation happens locally. Your configuration data never reaches a server.
- ✓ Smart string quoting: The JSON→YAML converter automatically quotes strings that could be misread as booleans, numbers, or YAML special values.
- ✓ One-click download: Save your converted output directly to a
.yamlor.jsonfile without leaving the page.
Common Use Cases
Kubernetes & Docker
Convert JSON-based API responses or Helm chart values into YAML manifests for Kubernetes deployments, services, and ConfigMaps — or reverse-convert YAML configs to JSON for programmatic processing.
CI/CD Pipelines
GitHub Actions, GitLab CI, CircleCI, and most modern CI/CD platforms use YAML for workflow definitions. Convert JSON-based configuration templates to YAML format ready for deployment.
API Development
OpenAPI / Swagger specs support both JSON and YAML. Convert between them when switching tools or when your team prefers one format over the other for documentation or SDK generation.
Infrastructure as Code
Ansible playbooks, AWS CloudFormation templates (in YAML mode), and Terraform variable files all use YAML. Convert JSON outputs from tools like terraform show -json into readable YAML.
Application Config
Convert your application's JSON configuration files (like appsettings.json) into YAML for services that expect YAML-based configuration, such as Spring Boot, Rust (config-rs), or Ruby on Rails.
Data Exploration
When exploring deeply nested API responses, converting JSON to YAML makes the hierarchy far more visible and easier to scan — especially useful in documentation or code reviews.
Frequently Asked Questions
What is the difference between JSON and YAML?
JSON (JavaScript Object Notation) uses braces, brackets, and quotes to represent structured data — it is strict and machine-friendly. YAML (YAML Ain't Markup Language) uses indentation and minimal punctuation to represent the same data — it is more human-readable and commonly used in configuration files like Docker Compose, Kubernetes manifests, and GitHub Actions workflows.
Is my data sent to a server during conversion?
No. All conversion logic runs entirely in your browser using JavaScript. Your JSON or YAML data never leaves your device and is never transmitted to any server, making this tool safe for sensitive configuration data.
What YAML features does the parser support?
The YAML parser supports scalar key-value pairs, nested objects (via indentation), sequences/lists (using the dash "-" prefix), multi-line values, quoted strings, boolean values (true/false), null values, and numeric types. Complex YAML features like anchors (&), aliases (*), or multi-document streams (---) are not supported.
When should I use YAML instead of JSON?
Use YAML for human-edited configuration files such as CI/CD pipelines (GitHub Actions, GitLab CI), container orchestration (Kubernetes, Docker Compose), Infrastructure as Code (Ansible, Terraform), and application settings. Use JSON for APIs, data interchange between services, and situations where strict parsing and language-native support matters most.
Why do some string values get quoted in the YAML output?
The JSON to YAML converter automatically adds quotes around string values that could be misinterpreted — for example, strings that look like numbers ("123"), booleans ("true", "false", "yes", "no"), or strings containing special YAML characters like colons or hashes. This ensures the YAML output is semantically identical to the original JSON.
Can I convert large JSON files with this tool?
Yes. Since all processing happens locally in your browser, there are no server-side file size limits. Performance depends on your device's memory and CPU, but this tool handles typical configuration files and API payloads with ease.
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Technical Notes
- JSON parsing uses the native browser
JSON.parse()for correctness - YAML serialisation and deserialisation are written in pure JavaScript — no external libraries
- YAML output uses 2-space indentation per nesting level
- Strings that could be misread as YAML scalars are automatically double-quoted
- YAML parser supports: scalars, nested mappings, and sequences (
- item) - Works offline after the page is loaded — no internet required