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JSON ⇄ YAML

Convert JSON to YAML and YAML to JSON with validation.

JSON ⇄ YAML

Runs entirely in your browser

This tool executes locally using standard browser APIs (for example window.crypto.getRandomValues or crypto.subtle where applicable). Your input is not transmitted to or stored on a ScriptPulse server. See How Calculations Work.

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What This Tool Does

  • The JSON ⇄ YAML Converter is a browser-first utility designed to convert JSON to YAML and YAML to JSON with syntax validation in real time. JSON and YAML are the two most common serialization formats used for configuration files and API transmissions. JSON is compact, making it ideal for machine-to-machine communications, but its rigid grammar (mandatory double quotes, no comments) makes it tedious to edit. YAML is indentation-based, supports comments, and is highly readable, but parser behaviors and spacing rules can be complex. The JSON ⇄ YAML Converter provides a fast way to switch between these formats.
  • The converter executes all transformations client-side in browser memory. No data is sent to external servers, protecting database connection strings, server IPs, and application settings from leaks.

How It Works

  • The tool reads the text string from the active input editor panel.
  • If converting JSON to YAML, the JavaScript engine parses the JSON string into an in-memory object and serializes it into YAML structures.
  • If converting YAML to JSON, the engine tokenizes the YAML indentation hierarchy, handles data types, and outputs a formatted JSON string.
  • Syntax errors (such as mismatched indentation or missing quotes) are caught and displayed in the warning panel.
  • The converted output is rendered in the results editor, with copy buttons enabled.

Usage

  1. Paste your source text (JSON or YAML) into the input editor panel.
  2. Select the target conversion action (JSON to YAML or YAML to JSON).
  3. Click the 'Convert' button to start the translation calculations.
  4. Review the parsed output in the results panel.
  5. Copy the result to your clipboard immediately.

Examples

  • Converting basic settings: Translating `{"app":"test","port":80}` into YAML indentation format.
  • Converting YAML arrays: Translating lists of servers into JSON array formatting.
  • Formatting complex nested mappings: Swapping multi-tier configuration mappings.
  • Checking document streams: Converting multiple documents inside a single YAML stream to JSON arrays.

Real-World Use Cases

  • Converting Docker or Kubernetes configuration files between JSON and YAML formats.
  • Translating raw API payloads (JSON) to readable configurations (YAML) for documentation.
  • Migrating project settings and preferences between JSON and YAML formats.
  • Validating YAML configurations against JSON Schema guidelines during development.
  • Teaching data serialization formats and differences in coding classes.

Best Practices

  • Use spaces (typically 2) for all YAML indentation alignments; never use tabs.
  • Always wrap ambiguous string values (like country codes or booleans) in double quotes in YAML files.
  • Combine conversion validations with syntax check steps in your build pipelines to catch spacing issues.
  • Store original config structures in source control to track conversion histories.

Common Mistakes

  • Using tab characters in YAML inputs: the YAML standard strictly forbids tabs for indentation, requiring spaces instead.
  • Expecting comments in YAML files to be preserved when converting to JSON: standard JSON does not support comments, so they are lost.
  • Pasting loose JavaScript literals into the JSON input, which throws syntax errors during parsing.
  • Ignoring the Norway problem: failing to quote values like 'NO' or 'yes' in older YAML specs, which converts them to booleans.

Limitations

  • Only supports standard JSON and YAML formats; custom tags or extensions may require manual adjustments.
  • Input size limits are restricted to 5MB to maintain browser thread responsiveness.
  • Calculations are client-side only; reloading the page clears the workspace.

Technical Reference Guide

  • JSON Standards: Compliant with RFC 8259 specifications.
  • YAML Standards: Generates manifests compliant with standard YAML 1.2 specifications.
  • superset Rules: YAML is a superset of JSON, meaning valid JSON is syntactically valid YAML.

Specifications & Standards

IETF RFC 8259 JSON SpecificationYAML 1.2 Specification Standard Reference
Browse the full Standards & References library →

FAQ

  • Is my configuration data secure?

    Yes. All conversion calculations run locally inside your browser memory using client-side JavaScript. No data is sent to external servers.

  • Why does the YAML parser reject tabs?

    YAML uses indentation to define structure. Since tabs render differently depending on editor settings, the YAML spec forbids them to prevent alignment errors.

  • Are comments preserved when converting YAML to JSON?

    No. Standard JSON does not support comments, so any comments in your YAML input will be stripped during conversion.

  • What is the Norway problem in YAML?

    In YAML 1.1, the country code 'NO' matches the boolean pattern for 'false'. Older parsers convert this to a boolean unless wrapped in quotes.

  • Can I convert multiple YAML documents at once?

    Yes. If your YAML input contains multiple documents separated by `---`, the converter will parse and combine them into a JSON array.

  • Why does the tool show 'unexpected token' for my JSON?

    Verify that your JSON input contains valid syntax, including double quotes around keys and strings, and has no trailing commas.

  • Is YAML faster to parse than JSON?

    No. JSON has a simple grammar and native parser support, making it much faster to parse than YAML, which requires complex indentation analysis.

  • Does the converter support custom YAML tags?

    The tool supports standard types. Custom class tags are ignored during local conversion to prevent remote execution risks.

  • Does this tool work offline?

    Yes. Once the page is loaded, the page assets are cached, allowing you to use all tools without an active internet connection.

  • What format is the output JSON?

    The output JSON is formatted with 2-space indentation to match standard readability guidelines.

  • Is YAML a superset of JSON?

    Yes. The YAML 1.2 specification is a strict superset of JSON, meaning any valid JSON document can be parsed as valid YAML.

  • How are null values converted?

    YAML null values (null, ~, Null) are converted to JSON's `null` primitive. JSON `null` is converted to YAML's lowercase `null` string.

Part of this Developer Hub

This utility is part of our comprehensive JSON Workshop topic workspace.

Explore foundational guidelines, technical specifications, and other interactive utilities related to this workflow.

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