Pulsars

JSON ↔ YAML Converter — Instant Bidirectional Conversion

JSON5 lines
YAML4 lines

JSON (JavaScript Object Notation) is a lightweight data-interchange format that uses braces, brackets, and double-quoted keys for structure. YAML (YAML Ain't Markup Language) is an indentation-based superset of JSON designed for human readability, widely used in configuration files for Docker Compose, Kubernetes, GitHub Actions, and CI/CD pipelines. Converting between JSON and YAML is one of the most frequent tasks in modern DevOps and web development workflows.

JSON vs YAML: Key Differences

Feature JSON YAML
Syntax Braces, brackets, quotes Indentation-based
Readability Moderate High
Comments Not supported Supported (#)
Data types String, number, bool, null, array, object Same + dates, binary, custom
Common use APIs, data exchange Config files (K8s, Docker, CI/CD)
File extensions .json .yml, .yaml

When to Use JSON vs YAML

Choose JSON when you need strict, unambiguous data interchange — REST APIs, browser storage (localStorage), package manifests (package.json), and anywhere machines are the primary consumers.

Choose YAML when human readability and editing matter — Docker Compose, Kubernetes manifests, GitHub Actions workflows, Ansible playbooks, and application configuration files. YAML's support for comments makes it ideal for documented configs.

Common Conversion Pitfalls

More Format Converters

This tool supports 6 data formats. Try our dedicated converters for specific workflows:

Need to encode data for an API? Check our Base64 encoder for quick text-to-Base64 conversion.

Frequently Asked Questions

What is the difference between JSON and YAML?

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JSON uses braces, brackets, and quotes for structure and is strict about syntax. YAML uses indentation for nesting and is designed for human readability. YAML supports comments, while JSON does not. Both represent the same data structures: objects, arrays, strings, numbers, booleans, and null.

Can YAML do everything JSON can?

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Yes, YAML is a superset of JSON. Any valid JSON document is also valid YAML. However, YAML also supports features JSON doesn't: comments, multi-line strings, anchors and aliases for reuse, and custom data types. For most use cases, they are interchangeable.

When should I use JSON vs YAML?

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Use JSON for APIs, data exchange between services, and when strict parsing is important. Use YAML for configuration files (Docker Compose, Kubernetes, CI/CD), where readability and comments matter. JSON is better for machines, YAML is better for humans.

Why is my YAML invalid?

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Common YAML errors include: incorrect indentation (YAML is indentation-sensitive, use spaces not tabs), missing colons after keys, unquoted strings that look like other types (e.g., 'true' interpreted as boolean), and special characters in unquoted strings. Our converter shows the exact error location.

Is this converter safe for sensitive data?

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Yes, all conversion happens directly in your browser using JavaScript. No data is sent to any server. Your JSON and YAML content never leaves your device, making it safe for configuration files, API keys (though you shouldn't share those), and any sensitive data.

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