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YAML to JSON Converter

Convert YAML to clean, valid JSON instantly. Paste YAML from a config file, Kubernetes manifest, or Docker Compose file and get properly typed JSON output, then copy or download the result. Free, private, runs entirely in your browser.

YAML Input
JSON Output
Conversion runs entirely in your browser. Nothing is uploaded or stored. Multi-document YAML (files using --- separators) and anchors/aliases are not supported.

About YAML to JSON Converter

YAML to JSON Converter turns YAML — the format behind Docker Compose files, Kubernetes manifests, GitHub Actions workflows, and countless application config files — into clean, standard JSON. Paste in your YAML and get back properly typed, pretty-printed JSON that any programming language or API can consume directly.

The converter correctly handles nested mappings, sequences, lists of objects using the common "- key: value" pattern, quoted and unquoted strings, and YAML's implicit typing rules for numbers, booleans, and null values, so the resulting JSON accurately reflects what your YAML actually means.

Features

  • Handles real-world YAML: Nested mappings, sequences, and lists of objects convert correctly, including the standard Kubernetes-style list format.
  • Correct implicit typing: Unquoted true/false, numbers, and null are converted to their proper JSON types, matching standard YAML parser behavior.
  • Comment stripping: YAML comments are automatically removed before conversion.
  • Pretty-printed JSON output: Two-space indented, readable, and diff-friendly.
  • Instant, in-browser conversion: No upload, no server round trip, no account.

How to Use

  1. Paste your YAML into the input box, or click "Load Sample" to see an example.
  2. Click Convert to generate the JSON output.
  3. Review the result — nested structures, lists, and types are converted automatically.
  4. Copy the JSON to your clipboard or download it as a .json file.

Examples

Example 1: A simple YAML config with name: api, port: 8080, and debug: false converts directly to a three-key JSON object with the correct string, number, and boolean types.

Example 2: A Kubernetes-style YAML list of routes, each written as a dash followed by indented key-value pairs, converts to a JSON array of objects — ready to use in application code or an API request body.

Benefits

  • Faster debugging: Turn a config file into JSON to inspect it in tools that expect JSON input.
  • API-ready output: Convert a YAML config into the JSON body your application or API expects.
  • Correct type conversion: Booleans, numbers, and null values are interpreted the same way a real YAML parser would.
  • 100% private: Nothing is uploaded — conversion runs locally in your browser.

Frequently Asked Questions

How does a YAML to JSON converter work?
The tool reads your YAML text, interprets its indentation-based structure into mappings, sequences, and scalars, then serializes that same structure as JSON using curly braces, square brackets, and double-quoted keys and string values.
Does converting YAML to JSON lose any information?
For standard YAML — mappings, sequences, strings, numbers, booleans, and null — no information is lost, since JSON can represent all of these directly. Advanced YAML-only features like anchors, aliases, multi-document files, and custom tags do not have a JSON equivalent and are not supported by most converters, including this one.
Why did a value like "yes" or "on" convert to true?
YAML 1.1 treats certain words such as yes, no, on, off, true, and false as booleans. If your YAML uses one of these words unquoted, it is interpreted as a boolean during conversion, matching how most YAML parsers behave. Quote the value in your YAML source if you want it to stay a literal string.
Can this tool handle YAML comments?
Yes. Lines starting with # are treated as comments and stripped out before parsing, exactly as a standard YAML parser would handle them, so they never appear in the resulting JSON.
Can I convert a Kubernetes manifest or Docker Compose file with this tool?
Yes, for single-document YAML files using standard block-style syntax. Multi-document YAML files (separated by ---) are not supported — convert one document at a time by removing the separators first.
What JSON formatting does the output use?
The output is pretty-printed JSON with two-space indentation, making it easy to read and diff. You can copy it as-is or download it as a .json file.
Is my data uploaded anywhere?
No. Parsing and conversion happen entirely in your browser using JavaScript. Your YAML never leaves your device or gets sent to a server.

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