JSON ↔ YAML Converter

Enter your data: Paste JSON or YAML into the input editor, or load the included example.

Choose the conversion direction: Convert JSON to YAML or YAML to JSON.

Adjust formatting: Select the desired YAML indentation or JSON output style.

Review validation: Check the converted result and any parser notices or error messages.

Copy or download: Copy the output, download it as a file, or move it back into the input editor for another conversion.

You can also upload a file or drag and drop it into the tool. With automatic conversion enabled, the result updates as you type.

Convert JSON to YAML or YAML to JSON with an online converter. Validate your input, identify parsing errors, adjust indentation and formatting, sort mapping keys, and copy or download the converted result.

JSON and YAML are two commonly used formats for storing and exchanging structured data. Both represent information using objects, arrays, strings, numbers, Boolean values, and other data types, but they use different syntax.

What is JSON?

JSON (JavaScript Object Notation) is a text-based data format commonly used by APIs, web applications, and software systems to exchange structured information.

JSON uses braces, brackets, quotation marks, and commas to organize data.

Example:

{

"name": "Alex",

"age": 30,

"active": true

}

What is YAML?

YAML is a human-readable data serialization format often used for configuration files, application settings, automation workflows, and documentation.

Instead of relying on braces and commas, YAML commonly uses indentation and key-value pairs to represent structured data.

Example:

name: Alex

age: 30

active: true

Different applications and development tools may expect different data formats. Converting between JSON and YAML helps you reuse structured data without manually rewriting it.

Common use cases include:

Configuration files: Convert JSON settings into YAML for tools and applications that use YAML configuration.

APIs: Change JSON API data into YAML for easier reading or documentation.

Application settings: Move structured settings between systems that support different formats.

Development workflows: Convert sample data when working with software libraries, scripts, and development tools.

Documentation: Present structured data in a format that is easier for readers to understand.

Example 1: JSON to YAML

Input JSON:

{

"name": "Alex",

"age": 30,

"active": true,

"skills": ["HTML", "CSS", "JavaScript"]

}

Converted YAML:

name: Alex

age: 30

active: true

skills:

- HTML

- CSS

- JavaScript

Example 2: YAML to JSON

Input YAML:

project: ToolboxShelf

version: 1

settings:

theme: dark

notifications: true

Converted JSON:

{

"project": "ToolboxShelf",

"version": 1,

"settings": {

"theme": "dark",

"notifications": true

}

}

Example 3: Nested data

JSON:

{

"user": {

"name": "Sam",

"location": {

"city": "Berlin",

"country": "Germany"

}

}

}

YAML:

user:

name: Sam

location:

city: Berlin

country: Germany

Both examples represent the same structured data. The syntax and formatting change, but the underlying values and relationships remain the same.

YAML indentation

Choose the indentation level used to display nested YAML data. Indentation controls the visual structure of YAML and must be consistent for the document to be parsed correctly.

JSON output formatting

Choose between formatted JSON, which uses indentation and line breaks for readability, and compact JSON, which removes unnecessary whitespace to produce a shorter representation.

Sort mapping keys

Enable key sorting to arrange mapping keys in a consistent order. This can make configuration files easier to compare and review.

Sorting changes the order in which mapping keys appear in the output. It does not change the intended key-value relationships.

Automatic conversion

Enable automatic conversion to update the output as you edit the input. You can also use manual conversion when you prefer to review your input before processing it.

The converter validates input before producing the converted output. If the input cannot be parsed, it reports a readable error message and includes the line and column when available.

For YAML input, the converter uses YAML 1.2 parsing and can flag:

Duplicate keys: Repeated mapping keys that may cause ambiguous or unexpected results.

Multiple YAML documents: Input containing more than one YAML document.

This converter processes one YAML document at a time. If your YAML file contains multiple documents, separate them and convert each document individually.

Parser notices help identify potential issues, but they are not a guarantee that the converted data will work in every application.

Example input: Load sample JSON or YAML to try the converter.

File upload: Select a file or drag and drop it into the input area.

Copy output: Copy the converted data to your clipboard.

Download output: Save the converted result as a file.

Move output to input: Use the current result as the next input for another conversion.

Clear controls: Clear the input and output when starting a new conversion.

Size details: View input and output size information.

Parser notices: Review validation messages and parsing details.