JSON Toolbox

Local Processing

JSON to YAML

Convert between JSON and YAML — ideal for K8s and docker-compose configs.

All-in-one JSON processing

From formatting and validation to conversion and export — 10 essential tools in one page. No install, no sign-up, ready to use.

Format & minify

Beautify with indentation or compress to a single line. Customizable indent size for reading or production.

Syntax validation

Detect JSON syntax errors with precise line/column numbers. Catch trailing commas, quote issues, and more.

Diff comparison

Side-by-side comparison of two JSON documents with highlighted additions, deletions, and changes.

Tree viewer

Browse complex JSON in a collapsible tree. Copy paths to quickly locate nested fields.

Format conversion

JSON ↔ YAML, JSON → XML, JSON → CSV / Excel — for config authoring and data export.

JSONPath

Debug JSONPath expressions online. Extract nested fields with one-click templates.

Who uses it? Common scenarios

Built for anyone who works with JSON daily — debugging, configuration, testing, and data export.

Frontend developers
  • Debug API responses and format log JSON
  • Extract nested values with JSONPath
  • Compare frontend/backend data structures
Backend developers
  • Validate incoming JSON payloads
  • Convert between JSON and YAML configs
  • Review API version structure changes
QA engineers
  • Diff API response payloads
  • Export test data to Excel
  • Convert and validate message formats
DevOps
  • Author K8s and docker-compose configs
  • Convert between JSON and YAML
  • Minify configs to reduce transfer size

Get started in 3 steps

Everything runs locally in your browser. Paste JSON and see results instantly — nothing is uploaded.

  1. 1

    Choose a tool

    Pick the feature you need from the top navigation — format, validate, diff, convert, and more.

  2. 2

    Paste or type JSON

    Paste JSON into the input area, or click Load sample to try each feature instantly.

  3. 3

    View results & export

    Results appear in real time on the right. Copy or download — all processing stays local.

Privacy firstClient-side architecture — JSON is parsed and processed only on your device. No upload, no storage, no tracking.

Convert between JSON and YAML formats instantly. Perfect for Kubernetes manifests, Docker Compose files, CI/CD pipelines, and any workflow that bridges JSON APIs with YAML configuration.

How to use

  1. 1 Select conversion direction: JSON → YAML or YAML → JSON.
  2. 2 Paste your input text into the editor.
  3. 3 Click Convert and copy or download the output.

Usage examples

JSON to YAML

{"apiVersion":"v1","kind":"ConfigMap"}

YAML to JSON

name: my-app
port: 8080

Why JSON Toolbox

  • Bidirectional JSON ↔ YAML conversion
  • Preserves nested structure and data types
  • No server processing — safe for secrets in configs
  • Ideal for DevOps workflows

Frequently asked questions

How do I convert JSON to YAML online?

Paste your JSON, select JSON → YAML, and click Convert. The output preserves all keys, values, and nesting.

Does the converter support YAML anchors?

Complex YAML features like anchors and multi-document files are not supported in the current version.

Is this tool free?

Yes. JSON Toolbox is completely free with no sign-up, no usage limits, and no hidden fees.

Is my JSON data safe? Is it uploaded to a server?

Your data never leaves your browser. All parsing, formatting, and conversion runs locally on your device — nothing is sent to any server.

Which browsers are supported?

All modern browsers including Chrome, Firefox, Safari, and Edge. No plugins or extensions required.

What is the maximum file size?

Files over 2 MB may feel slow; files over 10 MB are blocked. For very large payloads, use a local CLI tool instead.

Does it support JSON5, comments, or trailing commas?

Only standard JSON (RFC 8259) is supported. JSON5 features like comments and trailing commas are not accepted.

Continue exploring

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Further reading