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Workbench
Processed locally in your browser

Private, schema-aware
JSON & YAML tools

Private, schema-aware JSON and YAML tools that run entirely in your browser. No sign-up, no uploads — just fast, accurate developer tools that keep your data on your device.

Format JSONConvert YAML → JSONValidate against a schema
✓ 100% in-browser✓ No account required✓ Works offline✓ Handles 10 MB+ files

Private by default

Formatting, validation, conversion, and tree views run entirely in your browser. Documents are never uploaded.

Schema-aware

Validate JSON and YAML against JSON Schema Draft 2020-12 with path-grouped, human-readable errors.

Fast on large files

Heavy work moves to a Web Worker so the interface stays smooth, even on multi-megabyte documents.

Lossless YAML

Comments, anchors, aliases, tags, and key order are preserved. Conversions warn you before anything is lost.

Messy in, clean out — instantly

Paste minified or hand-edited JSON and get readable, valid output in milliseconds. It all happens right here in your browser.

Before
{"user":{"name":"Ada","roles":["admin","editor"],"active":true},"count":42}
After
● Valid
{
  "user": {
    "name": "Ada",
    "roles": [
      "admin",
      "editor"
    ],
    "active": true
  },
  "count": 42
}

Why developers choose the workbench

0
bytes uploaded to a server
10 MB+
documents handled smoothly
2020-12
JSON Schema draft supported
9
JSON & YAML tools in one place

Loved by developers

Sample content
The one JSON tool I can actually paste a production payload into — nothing leaves the browser, so I don’t have to think twice.
Sample reviewBackend Engineer
Schema validation with Draft 2020-12 and errors grouped by path saved our team an afternoon of guesswork.
Sample reviewPlatform Team Lead
YAML → JSON that actually warns me when anchors get expanded. Finally a converter that’s honest about what it changes.
Sample reviewDevOps Engineer

All tools

JSON Formatter

JSON

Format and beautify JSON with 2-space, 4-space, or tab indentation. Runs entirely in your browser — your data never leaves your device.

JSON Validator

JSON

Validate JSON and get precise line and column error locations, plus duplicate-key and number-precision warnings. Nothing is uploaded.

JSON Viewer

JSON

Explore JSON as a collapsible tree. Search keys and values, expand or collapse all, and copy any value or its JSON Pointer path. In-browser only.

JSON Minifier

JSON

Minify JSON to the smallest valid form by removing insignificant whitespace. Fast, private, and entirely client-side.

JSON to YAML

JSON

Convert JSON to YAML 1.2 while preserving key order. Runs locally in your browser with no uploads.

YAML Formatter

YAML

Format YAML 1.2 while preserving comments, anchors, aliases, tags, and key order. Private, in-browser processing.

YAML Validator

YAML

Validate YAML 1.2 and get exact error locations. Handles multiple documents, anchors, and block scalars. Nothing is uploaded.

YAML to JSON

YAML

Convert YAML 1.2 to JSON with clear warnings when features like comments, aliases, or multiple documents cannot be represented faithfully.

JSON Schema Validator

Schema

Validate JSON or YAML against a JSON Schema (Draft 2020-12) using AJV. Grouped, path-aware errors. Runs entirely in your browser.