Configuration workbench

JSON to YAML Converter

Validate JSON with exact diagnostics, then control how it becomes YAML for real configuration work. Every conversion stays in this browser tab.

Local processing

Formatting presets

Presets set output style only. They do not validate whether arbitrary JSON is a valid platform configuration.

Output choices

IndentStringsKey orderCollectionsDocument startInclude ---

Cmd/Ctrl + Enter

Copyable reference

Tested configuration examples

These examples are parsed and converted by the same code as the workbench. A preset controls formatting; it does not certify that arbitrary input satisfies a platform schema.

Kubernetes

Two-space block style with an explicit document marker.

JSON input

{
  "apiVersion": "apps/v1",
  "kind": "Deployment",
  "metadata": { "name": "web" },
  "spec": {
    "replicas": 2,
    "selector": { "matchLabels": { "app": "web" } },
    "template": {
      "metadata": { "labels": { "app": "web" } },
      "spec": { "containers": [{ "name": "web", "image": "nginx:1.27" }] }
    }
  }
}

YAML output

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: web
spec:
  replicas: 2
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: nginx:1.27

Docker Compose

Compact block YAML for services, volumes, and networks.

JSON input

{
  "services": {
    "web": {
      "image": "nginx:1.27",
      "ports": ["8080:80"],
      "environment": { "APP_ENV": "production" }
    }
  }
}

YAML output

services:
  web:
    image: nginx:1.27
    ports:
      - 8080:80
    environment:
      APP_ENV: production

GitHub Actions

Stable block YAML that keeps workflow key order intact.

JSON input

{
  "name": "CI",
  "on": ["push", "pull_request"],
  "jobs": {
    "test": {
      "runs-on": "ubuntu-latest",
      "steps": [
        { "uses": "actions/checkout@v4" },
        { "run": "npm ci && npm test" }
      ]
    }
  }
}

YAML output

name: CI
on:
  - push
  - pull_request
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm ci && npm test

Semantics, not slogans

JSON to YAML type and edge-case matrix

JSON and YAML overlap, but they are not identical. Review the JSON specification and YAML 1.2.2 specification for normative details.

JSON source	YAML behavior	What to check
Strings like true, null, 2026-07-18	Quoted when YAML could infer another type	String type preserved
null	null	Native in both formats
Unicode text	UTF-8 YAML text	Characters preserved
Integer above 9,007,199,254,740,991	Converted with a precision warning	Quote it in JSON to preserve every digit
JSON object key order	Preserved or alphabetized	Ordering is a presentation choice
Comments, anchors, aliases	Not generated	JSON cannot represent these YAML features
Multiple YAML documents	Not generated	One JSON value maps to one YAML document

Next steps: validate the reverse conversion with YAML to JSON, inspect structure with JSON Viewer, or return to the configuration hub.

How to Convert JSON to YAML

Paste valid JSON, select a formatting preset or individual output choices, then choose Validate & Convert. Syntax errors include a line and column. Review the summary and warnings before copying or downloading the .yaml file.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data format used extensively in web development and APIs. While great for machines, its bracket-heavy syntax can be harder to read for complex configurations.

What is YAML?

YAML is a human-oriented serialization language commonly used for configuration. Indentation is structural, plain strings can be type-like, and YAML also supports features such as comments and anchors that do not exist in JSON.

Common Use Cases

Developers convert JSON to YAML when drafting Docker Compose services, Kubernetes manifests, GitHub Actions workflows, application settings, documentation examples, and human-reviewable versions of API configuration.

Output Choices and Edge Cases

Automatic quoting protects strings that resemble booleans, nulls, or dates. Large integers beyond JavaScript's safe range receive a warning. JSON duplicate keys are already ambiguous, and JSON cannot carry YAML comments, anchors, aliases, tags, or multi-document streams.

Frequently Asked Questions

Does JSON to YAML preserve every YAML feature?

It preserves JSON objects, arrays, strings, numbers, booleans, and null values. JSON cannot represent YAML comments, anchors, aliases, custom tags, or multiple documents, so those features cannot be created from the source.

Can I choose YAML indentation and quoting?

Yes. Choose two or four spaces, automatic or explicit string quotes, block or flow collections, source or alphabetical key order, and an optional document marker.

Can I convert JSON with special characters?

Yes, special characters and Unicode are fully supported. The converter handles strings with quotes, newlines, and special characters correctly.

Do the Kubernetes and CI presets validate my configuration?

No. Presets apply safe formatting choices and tested examples only. Validate the resulting manifest or workflow with the platform's own schema and tooling before deployment.

Can I use this as a JSON to YAML config converter?

Yes. Paste a JSON object or array and the converter outputs readable YAML suitable for configuration drafts, documentation, and review.

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