JSON to YAML Converter

Convert JSON to YAML instantly — indent · quote style · flow mode · null/bool style · syntax highlight · 100% Free

JSON INPUT

📂

⚙ OPTIONS

Indent

Quotes

Null as

Bool as

Flow arraysShort arrays inline: [a, b, c]Flow objectsShort objects inline: {a: b}

YAML OUTPUT

📄

YAML output appears here

Paste JSON · click a Sample · or drop a .json file

app:
  name: CalcNation
  version: 3.0.0
  debug: false
features:
  - calculator
  - converter

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What is JSON to YAML Conversion?

YAML (YAML Ain't Markup Language) is a human-readable serialisation format widely used in configuration files — Docker Compose, Kubernetes, GitHub Actions, Ansible, and CI/CD pipelines. This tool converts any valid JSON to clean, formatted YAML instantly, with full control over indentation, quoting, null representation, boolean style, and flow style for compact output.

YAML vs JSON — When to Use Which

JSON is ideal for APIs and data exchange — strict syntax, universally supported. YAML is preferred for configuration files — more readable, supports comments, and allows multi-line strings. Use this converter when your tooling expects YAML input (Helm charts, k8s manifests, docker-compose.yml) but your data starts as JSON.

Frequently Asked Questions

What is JSON to YAML conversion?

YAML (YAML Ain't Markup Language) is a human-readable data serialisation format commonly used for configuration files (Docker Compose, Kubernetes, CI/CD pipelines, Ansible). This tool converts JSON data to YAML instantly, with full control over formatting style.

What does "Flow style" mean in YAML?

YAML has two styles: block style (each key on its own indented line) and flow style (inline, like JSON — { key: value }). Flow style is useful for short arrays and objects to keep the file compact.

How are null values represented in YAML?

YAML supports three ways to write null: null (explicit), ~ (shorthand tilde), or an empty value (just leave the field blank). All are valid YAML.

What is the difference between true/yes/on in YAML?

YAML 1.1 allowed true, yes, and on as boolean true values. YAML 1.2 only allows true. For modern tools (Go, Kubernetes) use true/false. For Ansible and older tools, yes/no is common.

Is my data safe?

Yes — 100% browser-side. No data is uploaded or sent to any server. All conversion happens locally in JavaScript.

Can I use this for Kubernetes or Docker Compose?

Yes. Use 2-space indent (standard for K8s), quotes: auto, and disable flow style for clean Kubernetes-compatible YAML. The K8s-style sample gives you a Deployment example to start from.