JSON Toolbox

Local Processing

JSON to CSV

Export JSON object arrays to CSV with preview and download.

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.

Export JSON arrays of objects to CSV format for spreadsheets, data analysis, and reporting. Preview the output table and download the CSV file with one click.

How to use

  1. 1 Paste a JSON array of objects into the input area.
  2. 2 Click Convert to generate a CSV preview table.
  3. 3 Download the CSV file or copy the output.

Usage examples

User list to CSV

[{"name":"Alice","age":30},{"name":"Bob","age":25}]

Product inventory

[{"sku":"A1","qty":100},{"sku":"B2","qty":50}]

Why JSON Toolbox

  • Automatic column detection from object keys
  • Live CSV preview before download
  • No server upload — safe for business data
  • Export to Excel with the JSON to Excel tool

Frequently asked questions

How do I convert a JSON array to CSV?

Paste an array of objects and click Convert. Column headers are derived from object keys.

What JSON structure is required for CSV conversion?

The input must be a JSON array where each item is a flat object with consistent keys.

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