Format, Validate & Explore JSON Instantly

Fast, private, and runs entirely in your browser. No sign-up, no server uploads, no limits.

Start Formatting JSON

●100% Private – runs locally

●No API calls – instant results

●Free forever – no sign-up

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JSON Formatter

Pretty print and minify JSON data with customizable indentation. Copy or download the result.

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JSON Viewer

Explore JSON as an interactive tree with expand/collapse, search, and data statistics.

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JSON Validator

Validate JSON syntax with detailed error messages, line numbers, and auto-fix for common issues.

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JSON Diff

Compare two JSON objects side by side. See additions, deletions, and changes highlighted instantly.

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JSON to Table

Convert JSON arrays into sortable, filterable tables. Export to CSV for Excel or Google Sheets.

Why Use JSON Tools?

100% Private

All processing happens in your browser. Your data never leaves your device.

Lightning Fast

No server round-trips. Instant formatting, viewing, and validation.

Free Forever

No sign-up, no limits, no premium tiers. Just tools that work.

Developer Focused

Built by developers, for developers. Clean UI with dark mode.

Common Use Cases

Format API Responses

Pretty print messy JSON responses from REST APIs and GraphQL endpoints for easy debugging.

Validate Config Files

Check JSON configuration files for syntax errors before deploying to production.

Compare JSON Objects

Diff two API responses or config versions to find exactly what changed.

Convert JSON to Tables

Turn JSON arrays into sortable tables and export to CSV for Excel or Google Sheets.

Explore Nested Data

Navigate deep, complex JSON structures with an interactive collapsible tree view.

Debug & Fix Errors

Find and auto-fix common JSON issues like trailing commas, single quotes, and missing brackets.

Coming Soon

JSON to TypeScript - Generate TypeScript interfacesJSON to GraphQL - Auto-generate GraphQL schemasJSON Path - Query specific fields with JSONPathAPI Response Viewer - Fetch and visualize API responsesJSON Schema Validator - Validate against JSON Schema

About JSON Tools

JSON Tools is a free collection of online utilities for working with JSON (JavaScript Object Notation) data. Whether you need to format an API response, explore a complex nested object, or validate a configuration file, our tools help you get the job done quickly and privately. Everything runs client-side in your browser — we never store or transmit your data.