YAML to JSON Converter Online
Convert YAML to JSON online in seconds. Free tool that turns config files, Kubernetes manifests, and CI YAML into clean JSON. Runs in your browser, no signup.
What is YAML to JSON Conversion?
YAML to JSON conversion is the process of taking a YAML file (the indented, human-readable format used by Kubernetes, Docker Compose, GitHub Actions, and most modern config tools) and turning it into JSON, the format almost every API, JavaScript app, and tooling library expects. The two formats hold the same kind of data: objects, arrays, strings, numbers, booleans. A yaml to json converter rewrites the structure for you, keeping the values and types intact. You'll usually run a yaml to json conversion when you need to feed config data into something that doesn't speak YAML, like a JavaScript script, a REST API call, or a tool that only reads JSON.
Why Convert YAML to JSON?
JSON is the universal format for APIs, browsers, and most modern programming languages. YAML is fantastic for humans to write and review, but the second you need to send that data to a service or load it in JavaScript, JSON is what works without extra setup. Converting yaml to json online comes up when you need to fetch config from a YAML source and pass it into a fetch call, paste a Kubernetes value into a tool that expects JSON, hand off configuration to a teammate working in JavaScript, or test API requests using YAML drafts.
How Our YAML to JSON Converter Works
When you click Convert, the tool parses your YAML using a strict YAML 1.2 parser, then serializes it as pretty-printed JSON in the right panel. Indented blocks become nested objects, dash-prefixed lists become arrays, and YAML types (booleans, numbers, dates, null) get the right JSON equivalent. Anchors and aliases are resolved, so reused fragments expand to their full value. Everything happens in your browser. We don't upload your yaml data to a server, which matters if it contains anything sensitive like API endpoints, hostnames, or credentials.
Features You Get
- One-click conversion: hit Convert and the JSON appears in the output panel.
- YAML 1.2 compliant: handles the full spec including anchors, aliases, and multi-document files.
- Type-aware output: numbers stay numbers, booleans stay booleans, null stays null.
- Pretty-printed JSON: two-space indentation by default so the output is easy to read.
- Upload support: load a .yaml or .yml file from your device or drag-and-drop it into the input.
- One-click copy: grab the JSON output with the Copy button and paste it anywhere.
How to Use the Tool
- Paste your YAML into the input editor, or use the Upload File button to load a .yaml or .yml file.
- Click the Convert button to generate the JSON output on the right.
- Click the Copy button to copy the JSON to your clipboard.
- Use the Clear button to reset both editors when you want to start over.
Common Use Cases
- API testing: drafting request payloads in YAML, then converting to JSON to send.
- Kubernetes work: turning K8s manifests into JSON for tools that only accept JSON.
- JavaScript apps: loading YAML config and passing it as JSON in fetch calls.
- Documentation: converting YAML examples to JSON for API docs that show both.
Example Conversion
Input (YAML)
name: John Doe age: 30 skills: - JavaScript - Python
Output (JSON)
{
"name": "John Doe",
"age": 30,
"skills": ["JavaScript", "Python"]
}