Is my JSON data sent to a server?

No. All formatting, validation, diffing, and conversion happen entirely in your browser. Your data never leaves your device unless you explicitly use a share feature.

Can JSON Toolkit handle large files?

Yes, JSON Toolkit is optimized for large documents. The tree viewer uses virtualized rendering to handle deeply nested structures without slowing down your browser.

Does it support JSONPath and JSON Schema?

JSON Toolkit supports JSONPath queries for extracting nodes. JSON Schema validation support may be available depending on the current version of the tool.

Can I convert JSON to CSV?

Yes, JSON Toolkit can flatten JSON arrays and objects into CSV format, which you can then download or copy to paste into a spreadsheet application.

JSON & Developer Tools

JSON Toolkit

Format, validate, diff, convert, and query JSON in the browser

Open JSON Toolkit

What it does

JSON Toolkit provides a complete environment for working with JSON data. You can format and beautify minified JSON, validate it against syntax rules, browse complex structures in a tree viewer, edit values inline, compare two JSON documents to find differences, convert JSON to CSV, XML, YAML, and TypeScript types, and run JSONPath queries to extract specific nodes. Documents can be saved locally and shared with teammates via persistent links.

Who it is for

JSON Toolkit is built for developers, API engineers, data analysts, QA testers, and anyone who works with structured data. It is especially useful for debugging API responses, preparing configuration files, comparing data payloads, and transforming JSON into other formats for downstream use.

Main features

Format & Beautify

Instantly format minified or messy JSON with configurable indentation and syntax highlighting.

Validate & Error Highlight

Detect syntax errors with line-level highlighting and clear error messages.

Tree Viewer & Editor

Browse large JSON structures in a collapsible tree and edit values inline without touching raw text.

JSON Diff & Compare

Compare two JSON documents side by side and highlight added, removed, and changed nodes.

Convert Formats

Transform JSON to CSV, XML, YAML, and TypeScript interfaces with a single click.

JSONPath Query

Extract specific nodes from complex JSON using JSONPath expressions.

Save & Share

Save documents locally and generate shareable links for collaboration.

Privacy notes

JSON Toolkit runs entirely in your browser. Your JSON data is never uploaded to a server for formatting, validation, diffing, or conversion. The save and share features use local storage or encrypted URL fragments, so your data stays under your control unless you explicitly choose to share a link.

Common use cases

Formatting a minified API response for readability
Validating a configuration file before deployment
Comparing two API responses to find what changed
Converting a JSON array into a CSV file for a spreadsheet
Extracting specific fields from a large nested payload using JSONPath
Generating TypeScript interfaces from a JSON sample
Sharing a formatted JSON document with a teammate