Free JSON Tools Online

A complete suite of browser-based JSON tools for developers. Format, validate, minify, repair, compare, and convert JSON data — all running locally in your browser for complete privacy. No signup, no server processing, instant results.

100% Browser-Based Instant Results Private & Secure No Registration

All JSON Tools

JSON Formatter

Format

Beautify and format JSON with customizable indentation for easy reading and debugging.

JSON Validator

Validate

Validate JSON syntax and pinpoint errors with exact line and column numbers.

JSON Minifier

Optimize

Remove whitespace and compress JSON to reduce file size for production deployment.

JSON Repair

Fix

Automatically fix common JSON syntax errors like trailing commas and missing quotes.

JSON Diff

Compare

Compare two JSON objects side by side and highlight every difference between them.

JSON to CSV

Convert

Convert JSON arrays into CSV format for importing into Excel, Google Sheets, or databases.

JSON to XML

Convert

Transform JSON data into properly nested XML for legacy system integration.

JSON to Code

Generate

Generate TypeScript, Java, C#, Python, Go, and Kotlin classes from JSON schemas.

JSON Escape / Unescape

Encode

Escape or unescape special characters in JSON strings for safe embedding.

JSON Flatten

Transform

Convert deeply nested JSON objects into flat key-value pairs for easier analysis.

JSON Path Finder

Query

Query and extract specific values from JSON using JSONPath expressions.

Common Use Cases

API Development

Format API responses for debugging, validate request payloads, and convert data between formats for testing.

JSON FormatterJSON ValidatorJSON to CSV

Configuration Management

Validate and beautify config files like package.json, tsconfig.json, or docker-compose before committing.

JSON ValidatorJSON FormatterJSON Minifier

Data Migration

Convert JSON to CSV for spreadsheets or XML for legacy systems. Diff two versions to verify changes.

JSON to CSVJSON to XMLJSON Diff

Code Generation

Paste an API response and instantly generate model classes in your preferred language.

JSON to CodeJSON FormatterJSON Validator

Why Browser-Based JSON Tools?

Data Stays Private

Your JSON never leaves your device. No server processing means no data leaks — safe for API keys, credentials, and sensitive configurations.

Instant Processing

No upload wait times. Even multi-MB JSON files process in milliseconds since everything runs locally in your browser.

Works Everywhere

No installation, no Node.js, no Python. Open in any modern browser on any device and start working immediately.

JSON Quick Reference

Valid JSON Example

{
  "name": "ByteJSON",
  "version": 2.0,
  "features": ["format", "validate"],
  "private": false,
  "metadata": null
}

Common Mistakes

XSingle quotes: {'key': 'value'}
XTrailing commas: {"a": 1,}
XUnquoted keys: {key: "value"}
XComments: // not allowed
OKDouble quotes: {"key": "value"}
OKTypes: string, number, boolean, null, array, object

Learn More About JSON

JSON Guide

Complete guide to JSON syntax, data types, and best practices.

Read guide

JSON vs XML

When to use JSON vs XML and key differences between the formats.

Read guide

Common JSON Errors

Fix the most frequent JSON syntax errors with practical examples.

Read guide

Frequently Asked Questions

Are these JSON tools free?

Yes, all JSON tools on ByteJSON are completely free with no usage limits, no registration, and no hidden fees.

Is my JSON data safe?

All processing happens in your browser using JavaScript. Your data is never uploaded to any server, never stored, and never logged. It is completely private.

What is the difference between formatting and validating JSON?

Formatting adds indentation and line breaks to make JSON readable. Validation checks the syntax for errors like missing commas or unclosed brackets. Our formatter does both simultaneously.

Can I convert JSON to Excel?

Yes. Use the JSON to CSV converter, then open the resulting CSV file in Excel or Google Sheets. This works for any JSON array of objects.

How do I fix broken JSON?

Use the JSON Repair tool to automatically fix common errors like trailing commas, missing quotes, and unescaped characters. For manual debugging, the Validator shows exact error locations.