YAML to JSON converter

Simply convert YAML to JSON with this online live converter.

Enable JavaScript to use the interactive tool. The guide below explains how it works.

YAML to JSON Converter

What it does

This tool parses YAML and outputs the same data as indented JSON. Paste your YAML into the left panel and the JSON appears on the right. YAML merge keys (<<) are resolved, and invalid YAML is reported instead of producing output.

Why someone uses it

Sending configuration from Kubernetes manifests, CI pipelines or Docker Compose files to tools and APIs that require JSON.
Checking exactly what data type YAML assigned to each value.
Finding indentation problems by seeing whether a file parses.
Learning how YAML structures map to JSON objects and arrays.

Step-by-step instructions

Paste your YAML into the input.
Resolve any "Provided YAML is not valid" message.
Copy the JSON from the output.

Examples

Input:

name: demo
replicas: 3
enabled: true
tags:
  - web
  - api

Output: an object with "name": "demo", "replicas": 3 (a number), "enabled": true (a boolean) and a "tags" array of two strings.

Understanding the results

Mappings become objects, sequences (dash lists) become arrays, and scalars are typed automatically: 3 is a number, true is a boolean, null or ~ becomes null. Anchors and aliases (&base, *base) and merge keys are expanded so the JSON contains the full values. Comments are removed. If the document is empty, no output is shown.

FAQs

Why did my value become a number or boolean? YAML infers types. Quote a value ("3", "yes") to keep it a string.
Does it handle multiple documents (---)? This tool is built for a single document.
Are comments preserved? No; JSON does not support them.
Is the YAML uploaded? No, conversion happens in your browser.

Common mistakes

Using tabs for indentation; YAML requires spaces.
Unquoted values such as no, on or 1.10 being interpreted as booleans or numbers, so 1.10 becomes 1.1.
Misaligned list items that silently change the nesting.
Duplicate keys within one mapping.

Use cases

Feeding a Kubernetes or CI config to a JSON-only validator.
Generating JSON fixtures from readable YAML.
Debugging unexpected type coercion in configuration.
Documentation and teaching.

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JSON to YAML: Convert back to YAML.
YAML Viewer: Format and sort YAML.
JSON Viewer: Format and explore JSON output.

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