Json To Yaml Converter — Free Online Tool

A JSON to YAML converter transforms JSON data into clean, human-readable YAML format. Developers use it to convert API responses, package configs, or data files into YAML for Kubernetes manifests, Docker Compose files, CI/CD pipelines, and other config-driven workflows.

Features

• Configurable indentation: Choose 2 or 4 spaces to match your project's YAML style guide.
• Alphabetical key sorting: Sort keys for predictable output that produces cleaner diffs in version control.
• Full type preservation: Strings, numbers, booleans, nulls, and nested structures convert accurately.
• Works completely offline: Once loaded, processes data without any internet connection.

Frequently Asked Questions

Can I convert nested JSON to YAML?

Yes. Nested objects and arrays convert into properly indented YAML mappings and sequences.

Does JSON to YAML preserve order?

By default key order is preserved. Enable Sort Keys for alphabetical ordering.

When should I use YAML instead of JSON?

YAML is preferred for config files (Kubernetes, Docker, GitHub Actions) because it supports comments and is more readable for humans.

Does it preserve JSON key order?

Yes. By default the converter preserves the original key order from your JSON input. Enable Sort Keys for alphabetical ordering.

Can it handle large JSON documents?

Yes. The tool processes JSON entirely in your browser. Documents up to several megabytes convert quickly depending on your device.

Is this tool free?

Yes, this tool is completely free with no usage limits, no ads, and no account required.

Does it work offline?

Yes. Once the page loads, all processing happens locally in your browser — no internet connection needed.

Is my data safe with this tool?

Absolutely. Your data never leaves your browser. Everything is processed client-side with zero server uploads.

What happened to smalldev.tools?

smalldev.tools is no longer available. Prism by SWEDevTools offers the same developer tools and more, with offline support, pipeline chaining, and completely free usage — no signup required.

Is Prism a good alternative to jsonformatter.org?

Yes. Prism offers the same JSON formatting and validation capabilities with full offline support, pipeline chaining, and zero ads. Your data never leaves your browser, unlike most online JSON tools.

How does Prism compare to jsonlint.com?

Prism provides all the JSON linting features of jsonlint.com plus offline processing, tool chaining, and complete data privacy. No data is ever uploaded to a server.