FreeKit is a collection of free online tools for developers, SEO professionals, designers, students, content creators, and everyday users.

Are all tools completely free?

Yes. Every tool on FreeKit is free to use without subscriptions or hidden charges.

Do I need to create an account?

No. You can use all tools instantly without creating an account.

No. Most tools process data locally in your browser, and we do not permanently store your inputs.

Can I use FreeKit on mobile devices?

Yes. Every tool is fully responsive and works on smartphones, tablets, laptops, and desktop computers.

How often are new tools added?

We regularly add new tools and improve existing ones based on user feedback and industry needs.

Which browsers are supported?

FreeKit supports all modern browsers, including Chrome, Edge, Firefox, Safari, and other Chromium-based browsers.

Can I share these tools with others?

Absolutely. You are welcome to share FreeKit with friends, colleagues, students, and your team.

How do I convert YAML to JSON?

Paste your YAML content into the input textarea and the JSON output is generated instantly. The converter uses a custom-built recursive parser that runs in your browser. Copy the result or use it directly — no server upload required.

What YAML features does the parser support?

The parser handles key-value pairs (key: value), nested objects using indentation, lists with the - prefix, and basic types including strings, numbers (integers and floats), booleans (true/false/yes/no), and null values. It uses 2-space indentation to determine nesting levels.

Does this tool use an external YAML library?

No, the converter includes a built-in YAML parser written from scratch. There are no external dependencies like js-yaml or yaml.js. This keeps the tool lightweight and fast. The parser handles the most common YAML patterns used in configuration files, Kubernetes manifests, and application settings.

Can it handle YAML anchors and aliases?

The built-in parser focuses on the most commonly used YAML features. Advanced features like anchors (&), aliases (*), and merge keys (<<) are not supported. For documents using these features, consider using a dedicated YAML library in your code. The parser handles the vast majority of real-world configuration files.

What is the difference between YAML and JSON?

YAML (YAML Ain't Markup Language) is a human-friendly data serialization format that uses indentation for nesting and supports comments. JSON is more strict with its syntax (double quotes required, no comments, no trailing commas) but is the standard for web APIs. YAML is often preferred for configuration files due to its readability, while JSON is preferred for data interchange.

Is my YAML data safe when using this converter?

Yes, all parsing and conversion happens entirely in your browser. Your YAML data is never sent to any server, stored, or tracked. You can safely convert sensitive configuration files, API keys, or any other confidential YAML data.

Can I convert Kubernetes or Docker Compose YAML to JSON?

Yes, as long as the YAML uses standard features supported by our parser. Most Kubernetes manifests and Docker Compose files use basic key-value pairs, nested objects, and lists — all of which are fully supported. For files using advanced YAML features like anchors, consider pre-processing the YAML first.

Does the parser handle multi-line strings?

The parser handles simple multi-line strings defined with the > (folded) and | (literal) block scalar indicators. Folded scalars join lines with spaces, while literal scalars preserve newlines. Quoted strings with multiple lines are also handled correctly.

How are YAML types mapped to JSON types?

The parser automatically detects types: YAML true/false/yes/no become JSON booleans, numbers (integers and floats) become JSON numbers, null/~ become JSON null, and everything else becomes JSON strings. Lists become JSON arrays and mappings become JSON objects.

Can I convert the JSON back to YAML?

Yes, use our JSON to YAML Converter to reverse the process. The Swap button in both tools lets you quickly pipe output from one converter into the input of the other for format chaining.

YAML to JSON Converter

Convert YAML to JSON format instantly with a built-in parser.

BeginnerData & File ConversionFreev1.0.0Updated Jun 22, 2025

YAML Input

JSON Output

JSON output will appear here...

100% Private — Your Data Never Leaves Your Browser

All YAML parsing and JSON conversion happen entirely in your browser with a built-in parser. No external libraries, no server, no tracking.

How to Use the YAML to JSON Converter

Paste your YAML — Enter or paste YAML content into the input textarea. This works with configuration files, Kubernetes manifests, CI/CD pipelines, or any YAML content. Click "Load Sample" to try with example data.
Instant conversion — The JSON output is generated automatically as you type. The built-in parser handles key-value pairs, nested objects via indentation, lists with the - prefix, and basic data types (strings, numbers, booleans, null).
Copy the result — Click "Copy JSON" to copy the formatted JSON to your clipboard. The output uses 2-space indentation for readability.
Swap or clear — Use Swap to move the JSON output back into the input field (useful for chaining with JSON to YAML Converter). Use Clear to reset and start over.

Features

Custom-built recursive YAML parser — zero external dependencies
Handles nested objects via 2-space indentation mapping
Parses lists defined with the - prefix at any nesting level
Automatic type detection: strings, integers, floats, booleans, and null
Supports quoted strings with both single and double quotes
Instant conversion — output updates as you type
Error display for malformed or unsupported YAML syntax
One-click copy to clipboard with visual confirmation
Swap button to pipe output into JSON to YAML converter
100% client-side processing — no uploads, no server, no tracking

Understanding YAML and JSON

What is YAML?

YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files. It uses indentation to define structure, supports comments with #, and is more forgiving than JSON. Popular uses include Kubernetes manifests, Docker Compose files, CI/CD pipelines (GitHub Actions, GitLab CI), and application configuration.

YAML vs JSON

YAML is more readable with its indentation-based syntax and support for comments, making it ideal for human-edited configuration files. JSON is stricter but is the universal standard for APIs and data interchange. Converting YAML to JSON is useful when you need to feed configuration data into APIs, databases, or JavaScript applications that expect JSON.

Type Mapping

The converter automatically maps YAML types to JSON types: true/false/yes/no become JSON booleans, integers and floating-point numbers become JSON numbers, null/~ become JSON null, and all other values become JSON strings. Lists become JSON arrays and mappings become JSON objects.

Supported YAML Features

The built-in parser supports the most commonly used YAML features: key-value pairs with colon separator, nested objects via indentation, lists with - prefix, quoted strings, boolean values, numbers, and null. Advanced features like anchors, aliases, merge keys, and complex multi-line scalars are not supported by this lightweight parser.

Common Use Cases

Kubernetes to JSON

Convert Kubernetes deployment YAML manifests into JSON format for use with kubectl apply -f, API servers, or custom tooling that requires JSON input.

CI/CD Configuration

Convert GitHub Actions, GitLab CI, or CircleCI YAML configurations to JSON for programmatic manipulation, validation, or migration between CI/CD platforms.

App Configuration

Convert application configuration files from YAML to JSON for use in Node.js, Python, or other runtime environments that prefer JSON configuration.

API Payload Preparation

Transform YAML data into JSON to use as request bodies for REST APIs, GraphQL inputs, or webhook payloads.

Data Validation

Convert YAML to JSON and then use a JSON Schema validator to verify the structure and data types of your configuration.

Documentation

Convert YAML reference examples to JSON for documentation, tutorials, or code samples that show JSON format.

YAML to JSON Conversion Tips

After converting to JSON, use JSON Formatter to re-indent or minify the output with additional formatting options.
To reverse the conversion, use the Swap button and then open JSON to YAML Converter — or use it directly with the JSON output.
Use 2-space indentation in your YAML for best results with the parser. Other indentation sizes (4 spaces, tabs) may not be parsed correctly.
For YAML files with anchors (&anchor) or aliases (*anchor), pre-process the file to resolve references before pasting into the converter.
If the parser shows an error, check for inconsistent indentation — YAML is very sensitive to spacing. Each nesting level should use exactly 2 spaces.
Comments in YAML (lines starting with #) are automatically ignored by the parser and will not appear in the JSON output.

Frequently Asked Questions

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How to Use the YAML to JSON Converter

Paste your YAML — Enter or paste YAML content into the input textarea. This works with configuration files, Kubernetes manifests, CI/CD pipelines, or any YAML content. Click "Load Sample" to try with example data.

Instant conversion — The JSON output is generated automatically as you type. The built-in parser handles key-value pairs, nested objects via indentation, lists with the - prefix, and basic data types (strings, numbers, booleans, null).

Copy the result — Click "Copy JSON" to copy the formatted JSON to your clipboard. The output uses 2-space indentation for readability.

Swap or clear — Use Swap to move the JSON output back into the input field (useful for chaining with JSON to YAML Converter). Use Clear to reset and start over.

Features

Custom-built recursive YAML parser — zero external dependencies

Handles nested objects via 2-space indentation mapping

Parses lists defined with the - prefix at any nesting level

Automatic type detection: strings, integers, floats, booleans, and null

Supports quoted strings with both single and double quotes

Instant conversion — output updates as you type

Error display for malformed or unsupported YAML syntax

One-click copy to clipboard with visual confirmation

Swap button to pipe output into JSON to YAML converter

100% client-side processing — no uploads, no server, no tracking

Understanding YAML and JSON

What is YAML?

YAML vs JSON

Type Mapping

Supported YAML Features

Common Use Cases

Kubernetes to JSON

Convert Kubernetes deployment YAML manifests into JSON format for use with kubectl apply -f, API servers, or custom tooling that requires JSON input.

CI/CD Configuration

Convert GitHub Actions, GitLab CI, or CircleCI YAML configurations to JSON for programmatic manipulation, validation, or migration between CI/CD platforms.

App Configuration

Convert application configuration files from YAML to JSON for use in Node.js, Python, or other runtime environments that prefer JSON configuration.

API Payload Preparation

Transform YAML data into JSON to use as request bodies for REST APIs, GraphQL inputs, or webhook payloads.

Data Validation

Convert YAML to JSON and then use a JSON Schema validator to verify the structure and data types of your configuration.

Documentation

Convert YAML reference examples to JSON for documentation, tutorials, or code samples that show JSON format.

YAML to JSON Conversion Tips

After converting to JSON, use JSON Formatter to re-indent or minify the output with additional formatting options.

To reverse the conversion, use the Swap button and then open JSON to YAML Converter — or use it directly with the JSON output.

Use 2-space indentation in your YAML for best results with the parser. Other indentation sizes (4 spaces, tabs) may not be parsed correctly.

For YAML files with anchors (&anchor) or aliases (*anchor), pre-process the file to resolve references before pasting into the converter.

If the parser shows an error, check for inconsistent indentation — YAML is very sensitive to spacing. Each nesting level should use exactly 2 spaces.

Comments in YAML (lines starting with #) are automatically ignored by the parser and will not appear in the JSON output.

Frequently Asked Questions