YAML Parser Online

Paste YAML to validate it, explore the structure in an interactive tree, and view formatted output with type statistics.

Last updated: May 28, 2026

YAML Input

Parsed Tree

{3}

server: {3}

host: "localhost"

port: 8080

tls: true

database: {3}

driver: "postgres"

name: "myapp"

pool: {2}

min: 2

max: 10

features: [3]

0: "auth"

1: "logging"

2: "metrics"

Objects

Arrays

Strings

Numbers

Booleans

Nulls

Max depth

Client-Side Processing

Input Data Stays on Device

Instant Local Execution

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What is YAML Parser Online?

This online YAML parser validates your YAML document and displays the parsed structure in a collapsible tree view. Each node shows its key and type — object, array, string, number, boolean, or null. The right panel shows a formatted YAML output and statistics about the document's composition.

How to Use YAML Parser Online

Paste YAML into the input panel.

Check the tree on the right — expand/collapse nodes by clicking the arrows.

View type statistics at the bottom.

Copy the formatted output if needed.

Common Use Cases

Validating a YAML config file before deploying.
Exploring the structure of a YAML API response.
Checking YAML syntax errors with a descriptive error message.
Understanding the shape of a complex YAML document.

Example Input and Output

A YAML document is parsed and shown as a collapsible tree.

YAML input

name: Alice
address:
  city: London
tags:
  - admin

Tree view

▾ {3}
  name: "Alice"
  ▾ address: {1}
    city: "London"
  ▾ tags: [1]
    0: "admin"

Tip

Click any object or array node's arrow to expand or collapse it. Nodes deeper than 3 levels start collapsed to keep the view manageable.

Frequently Asked Questions

What does the tree show?

Each node shows its key (or array index) and value. Objects show a count of keys, arrays show a count of items. Leaf values show their type with color coding.

Does this support multi-document YAML?

No. Multi-document YAML (documents separated by ---) is not currently supported; only the first document is parsed.

Is my YAML sent anywhere?

No. All parsing happens in your browser.