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YAML to JSON & JSON to YAML Converter

Convert YAML configurations to JSON and JSON back to clean YAML in your browser, with line-accurate syntax validation.

Runs 100% in your browser Free, no sign-up Updated

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by ProWebLook

How to use the YAML to JSON Converter

  1. Paste YAML or JSON into the left editor, or load a sample Docker Compose / Kubernetes manifest.
  2. Select “YAML → JSON” or “JSON → YAML” mode and pick your preferred indentation (2 spaces, 4 spaces, or minified JSON).
  3. Optionally enable “Sort keys alphabetically” to normalize configuration files before diffing or committing.
  4. Copy the converted output or download it as a .json or .yml file.

What is a YAML to JSON & JSON to YAML converter?

YAML (YAML Ain’t Markup Language) and JSON (JavaScript Object Notation) are the two foundational serialization formats of cloud-native software development. Kubernetes manifests, Helm values, Docker Compose stacks, GitHub Actions workflows, Ansible playbooks, and OpenAPI 3.0 specifications are almost universally authored in YAML for human readability and inline comments. Meanwhile, REST APIs, CLI tools like jq, programmatic SDKs, and browser applications consume strict JSON.

This bidirectional YAML to JSON & JSON to YAML Converter parses and transforms configurations in real time right inside your browser — keeping your Kubernetes secrets, CI/CD variables, and API specs completely private on your machine.

Key capabilities for DevOps and API engineers

  • Nested block mappings & sequences: Accurately parses indentation-scoped maps, hyphenated arrays (- item), inline flow arrays ([a, b, c]), and inline flow objects ({key: value}).
  • Multiline block scalars: Supports both literal block scalars (|, which preserve newline characters) and folded block scalars (>, which fold single newlines into spaces) — essential for embedded shell scripts in GitHub Actions or ConfigMaps in Kubernetes.
  • Multi-document YAML streams: Handles Kubernetes manifests separated by --- document markers, automatically returning a JSON array of documents when multiple manifests are present.
  • Smart scalar quoting in JSON-to-YAML mode: Automatically quotes strings that would otherwise be misinterpreted by YAML 1.1/1.2 parsers — including boolean-like strings ("true", "yes", "no", "on", "off"), numeric strings with leading zeros, or strings containing colons and hash symbols.

Common YAML gotchas to watch out for

  • Tabs vs. spaces: The YAML specification forbids literal tab characters for indentation. If a YAML file fails to parse, check for mixed tabs and spaces.
  • The “Norway problem” and unquoted scalars: In YAML 1.1, unquoted two-letter country code NO or strings like on/off are parsed as booleans. Always wrap country codes, version numbers (like "3.10"), and phone numbers in quotes.
  • Next steps with your converted JSON: Once you convert a YAML file to JSON, you can generate TypeScript interfaces or Zod schemas with our JSON to TypeScript & Go Converter, compare two versions structurally in the JSON Diff Viewer, or convert CLI flags into Compose YAML using the Docker Run to Compose Converter.

Frequently asked questions

Is my YAML or JSON configuration uploaded to a server?
No. Conversion and validation run 100% locally in your browser. Kubernetes secrets, Docker Compose environment blocks, GitHub Actions workflows, and OpenAPI specifications never leave your device.
Which YAML features are supported?
The parser supports nested mappings, block and flow sequences ([a, b]), inline objects ({k: v}), single and double-quoted strings, literal (|) and folded (>) multi-line block scalars, booleans, numbers, nulls (null / ~), comments, anchors (&), aliases (*), merge keys (<<:), and multi-document YAML (---).
Why did my YAML fail with an indentation or tab error?
The YAML specification forbids hard tab characters for indentation because different editors render tabs at different widths. Always indent YAML with spaces (typically 2 spaces per level). When an error occurs, the validator reports the exact line number.
What happens to YAML comments when converting to JSON?
Standard JSON (RFC 8259) does not support comments, so # comments are stripped during YAML-to-JSON conversion. If you need to compare two YAML files while viewing comments, use the Code Diff Checker.
How are multi-document YAML files (separated by ---) converted to JSON?
If a YAML file contains a single document, it converts directly to its root JSON value. If it contains multiple documents separated by ---, the converter outputs a JSON array containing each parsed document.

Last updated . Launched with bidirectional YAML/JSON conversion, multi-line block scalars, anchor/alias resolution, and key sorting.

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