YAML Input

JSON Output

What is YAML to JSON Converter?

Need to convert your YAML (YAML Ain't Markup Language) to JSON (JavaScript Object Notation)? This tool does that instantly. JSON is the standard for modern APIs, while YAML is great for configuration files. Convert between them whenever you need.

According to MDN Web Docs, both YAML and JSON are popular data formats. YAML is often used in config files (like Docker Compose, Kubernetes, or CI/CD pipelines), while JSON is standard for APIs and web applications. The converter keeps the details that usually go wrong: a 19-digit ID stays the same 19 digits, released: 2024-01-15 stays the string "2024-01-15" instead of turning into a midnight UTC timestamp, and a multi-document file separated by --- becomes a JSON array with one entry per document.

A few things don't survive because JSON has nowhere to put them: comments are dropped, and anchors and aliases (&base, *base, <<: *base) are expanded into full copies. The conversion itself is done by JavaScript on this page; the YAML you paste is never sent anywhere.

How to Use the YAML to JSON Converter

Paste, check, copy. The JSON updates as you type.

Paste, Upload, or Load Sample

Paste YAML into the left panel, or click Upload to load a file. Click Sample to see example telecomm subscriber YAML. Example:

subscriber:
  subscriberId: SUB-1001
  plan: Unlimited 5G
  dataUsage: 45.2
  status: active
  carrier: Verizon

View JSON Output

The right panel shows the JSON output instantly. Structure is preserved. Invalid YAML shows an error before conversion.

Download, Copy, or Minify

Click Download to save as .json, or Copy to clipboard. Click Minify for compact JSON. Use Clear to start fresh. All processing runs in your browser.

When You'd Actually Use This

Config to API

Convert YAML configs to JSON for use in REST APIs. Great for generating API responses from configuration files or moving configs to JSON-based systems.

Format Preference

Some systems require JSON format. Convert your YAML data to JSON when working with tools or systems that only accept JSON.

API Development

kubectl get -o yaml or helm template gives you a multi-document stream. Paste it here and you get a JSON array you can feed to jq or a script, one element per manifest.

Data Migration

Migrate YAML data to JSON-based systems. Convert data formats when moving between systems or integrating with applications that prefer JSON.

Common Questions

Is my YAML data stored?

Nope. Everything happens right in your browser. Your YAML never leaves your computer – we don't even see it.

What YAML formats work?

Any valid YAML 1.2 document: mappings, sequences, nested structures, block and folded strings, anchors and merge keys. Files with several documents separated by --- are converted to a JSON array, one element per document. Comments are dropped, since JSON has no comments.

How are nested structures handled?

Nested mappings become nested JSON objects and sequences become arrays. Strings, numbers, booleans and null map straight across. Integers bigger than JavaScript can hold exactly (like an ICCID 8901240544102066246) are written back with every digit, and unquoted dates such as 2024-01-15 come out as the same text in a JSON string.

Can I convert JSON back to YAML?

Yep. Use our JSON to YAML converter to convert JSON files back to YAML format.

What if my YAML has special characters?

Special characters are properly escaped in JSON. Strings with quotes, backslashes, or other JSON syntax characters are handled correctly.

Does it work with large datasets?

A few MB of YAML converts in well under a second on a normal laptop. The whole document is parsed in memory in your browser, so a file of hundreds of MB is better handled with yq -o=json on the command line.

Other YAML Tools You Might Need

Conversion is just one YAML task. Here are other tools that work well together: