7 powerful JSON tools · 100% in your browser

The complete JSON toolkit for developers

Format, validate, convert, compare and query JSON — fast, private and free. No uploads, no sign-up. Try the formatter right here.

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Every JSON tool you need

Seven focused tools that work together. Pick one to get started.

Formatter

Beautify, minify and sort keys

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Viewer

Explore JSON as a collapsible tree

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Editor

Edit with live syntax & error checks

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Validator

Validate JSON & JSON Schema

Open

Diff

Compare two JSON documents

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Converter

JSON ⇄ CSV, YAML, XML, code

Open

JSONPath

Query JSON with JSONPath

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Private by design

All formatting, validation and conversion runs in your browser. Your JSON never touches a server.

Fast & interactive

Resizable panes, a command palette (⌘K), keyboard shortcuts and instant client-side feedback.

Built for scale

Handle large documents with an efficient editor, lazy-loaded per tool to keep everything snappy.

Free online JSON tools

JSON Toolkit is a free, all-in-one platform for working with JSON. Whether you need to format and beautify JSON, validate JSON against a schema, compare two JSON files, convert JSON to CSV, YAML or TypeScript, or run JSONPath queries, everything works instantly in your browser.

Because the tools are client-side, your data stays private and there is nothing to install. Save documents to get clean, shareable public links you can send to your team.