🔄 YAML ⇄ JSON Converter

Convert between YAML and JSON formats with validation and beautification

📝 YAML Input Invalid

Pretty Print

Validate Schema

📤 Output No Output

Converted output will appear here...

💡 Sample Data

Try these examples to test the converter:

About YAML ⇄ JSON Converter

Our free online YAML to JSON converter (and vice versa) helps developers quickly convert between these popular data formats. Whether you're working with configuration files, API responses, or data serialization, our tool provides instant conversion with validation and formatting options.

Features

Two-way Conversion: Convert YAML to JSON and JSON to YAML
Auto-detection: Automatically detects input format and converts accordingly
Schema Validation: Validate your data structure during conversion
Pretty Printing: Format output with proper indentation and spacing
Copy as Code: Copy converted output as ready-to-use code snippets
Download Support: Save converted files directly to your device

How to Use

Paste your YAML or JSON data into the input area
Choose your conversion direction or use "Auto Convert"
Enable format options like pretty printing and schema validation
Copy or download the converted output

Common Use Cases

✅ Configuration Files: Convert between YAML and JSON configs
✅ API Development: Transform API responses between formats
✅ Data Migration: Convert legacy data formats
✅ Documentation: Create examples in different formats
✅ Testing: Validate data structure conversions

What is YAML?

YAML (YAML Ain't Markup Language) is a human-readable data serialization format that uses indentation instead of brackets. It is a superset of JSON — any valid JSON is also valid YAML 1.2 — but adds features that make it better for configuration files: comments, multi-line strings, anchors and aliases, and optional string quotes.

Key Differences Between YAML and JSON

Comments — YAML supports # comments; JSON has no comment syntax

Quotes — YAML string quotes are usually optional; JSON always requires double quotes

Multi-line strings — YAML has native block scalar syntax (| literal, > folded); JSON uses

escape sequences

Anchors & aliases — define a value once with &name, reuse it with *name

Type inference — YAML auto-infers types (yes → boolean); JSON types are always explicit

When to Use Each Format

YAML: config files maintained by humans — Kubernetes manifests, Docker Compose, GitHub Actions, Helm charts, Ansible playbooks. Comments and readability matter more than parse speed.

JSON: API payloads, machine-to-machine exchange, JavaScript tooling configs (package.json, tsconfig.json), NoSQL database documents. Strict syntax prevents type coercion surprises.

Is YAML a superset of JSON?

Yes — in YAML 1.2, any valid JSON document is also valid YAML. You can parse a JSON file with a YAML parser. The reverse is not true: YAML comments, anchors, and block scalars have no JSON equivalent.

What is the YAML boolean gotcha?

In YAML 1.1 (used by many tools), values like yes, no, on, off, true, false are all parsed as booleans. Country code NO becomes boolean false; version 1.0 becomes a float. Quote strings that look like booleans or numbers: country: "NO", version: "1.0".

Why does Kubernetes use YAML instead of JSON?

Kubernetes supports both, but YAML is the default because it is more readable for complex nested configs, supports comments for explaining choices, and is less verbose for humans to write. Most kubectl commands accept JSON too.