Yaml To Json Converter — Free Online Tool

A YAML to JSON converter transforms YAML configuration files and data into JSON format for use in APIs, JavaScript applications, and JSON-only tooling. SWEDevTools: Prism provides a free, browser-based YAML to JSON converter that processes everything locally—no configuration files are ever uploaded to a server—with support for multiple indent styles, key sorting, and real-time error reporting.

Features

• Multiple indent options: Choose 2-space, 4-space, tab, or minified (0) indentation for the JSON output to match your project conventions.
• Alphabetical key sorting: Sort all object keys alphabetically for consistent, diff-friendly JSON output that works well with version control.
• Clear error reporting: Shows specific YAML parse error messages with line numbers and suggestions when conversion fails.
• Works offline as a PWA: Install SWEDevTools: Prism and convert YAML to JSON without an internet connection.
• No signup required: Convert YAML instantly with zero account creation, no email verification, and no usage limits.
• Local-first privacy: All conversion happens in your browser. No YAML or JSON data is sent to any server.
• Pipeline chaining support: Chain converted JSON into validators, formatters, diff tools, or other converters in a single workflow.

Frequently Asked Questions

Is the YAML to JSON converter free?

Yes, the SWEDevTools: Prism YAML to JSON converter is completely free with no signup, no ads, and no usage limits.

Does the YAML to JSON converter work offline?

Yes. SWEDevTools: Prism is a PWA that works without an internet connection once installed on your device.

Is my data safe when converting YAML to JSON?

Yes. All conversion happens locally in your browser. No data is ever uploaded to a server, making it safe for private configurations and secrets.

Does YAML to JSON conversion preserve comments?

No. JSON does not support comments, so YAML comments (lines starting with #) are dropped during conversion. Document important comments separately.

Can I convert multi-document YAML?

The tool processes the first YAML document separated by ---. Split multi-document YAML files and convert each document separately.

Are YAML anchors and aliases supported?

Yes. The parser resolves YAML anchors (&) and aliases (*) before converting to JSON, producing fully expanded output.

Why did my YAML fail to convert?

Common issues include inconsistent indentation (mixing tabs and spaces), missing colons after keys, and unquoted special characters. The error message will indicate the line and issue.

Can I convert JSON back to YAML?

Yes. SWEDevTools: Prism includes a separate JSON to YAML converter tool for the reverse direction.

How is this different from using yq CLI?

yq requires installation and terminal access. SWEDevTools: Prism works in any browser, requires no installation, offers visual output formatting, and provides pipeline chaining with other dev tools.

Does it handle Kubernetes YAML files?

Yes. The converter handles complex Kubernetes manifests with nested mappings, sequences, and multi-level configurations. Convert to JSON for use with kubectl apply -f or API calls.

Is Prism a good alternative to online YAML to JSON converters?

Yes. SWEDevTools: Prism converts YAML to JSON entirely in your browser with no data uploads, works offline as a PWA, requires no signup, and supports pipeline chaining into JSON validators, formatters, and other converters. Most online alternatives upload your data to their servers.

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.