Is JSON Web Tools free to use?

Yes, JSON Web Tools is completely free to use. All 68+ professional tools are available at no cost with no registration required. No premium tiers, no hidden fees.

Does JSON Web Tools work offline?

Yes, all JSON processing is done client-side in your browser, so it works offline after initial page load. No data is sent to external servers.

What JSON tools are available?

JSON Web Tools offers 68+ professional tools including: Validator, Security Scanner (XSS/SQL detection), JWT Decoder, Batch Validator, Performance Benchmark, 19 Language Converters (TypeScript, Rust, Go, Python, Java, C#, Swift, Kotlin, PHP, Ruby, etc.), Format Converters (CSV, YAML, XML, SQL, Excel, GraphQL, Protobuf, TOML), Advanced Tools (JSON Masking, Size Analyzer, Optimizer, Schema Generator), and Utilities (Diff, Tree View, JSONPath, Merge, Sort).

Is my data safe when using JSON Web Tools?

Yes, all processing happens locally in your browser. Your JSON data never leaves your device and is not sent to any server, ensuring complete privacy and security.

What is the Command Palette feature?

Press Cmd+K (or Ctrl+K) to instantly search and access any of the 68+ tools. The Command Palette provides keyboard-first navigation for power users.

Can I save my JSON snippets?

Yes, you can save frequently used JSON snippets locally (Cmd+S), mark tools as favorites, and your usage history is preserved. All data stays in your browser's local storage.

Does JSON Web Tools support TypeScript conversion?

Yes, you can convert JSON to TypeScript types/interfaces automatically. We also support 18 other languages including Rust, Go, Python, Java, C#, Swift, Kotlin, and more.

How do I import cURL commands?

In the REST API Tester tool, click 'Import cURL' and paste any cURL command. It will automatically extract the method, URL, headers, and request body.

Is JSON Web Tools better than paid alternatives?

JSON Web Tools offers 68+ tools completely free, while alternatives like JSON Hero cost $200/year for only 15 tools. We provide more features, better UX (Command Palette, favorites, saved snippets), and 100% privacy - all at no cost.

68+ Tools · 100% Free · No Signup · Works Offline

The Complete JSON Toolkit

Validate, convert, transform & analyze JSON instantly.
Everything runs in your browser — completely private.

✓ 100% Private ✓ No Account ✓ Offline Ready ✓ Free Forever

⭐ Favorites

🕐 Recently Used

📊 Your Usage Stats

3,247

Total Tool Uses

Tools Explored

Saved Snippets

Favorite Tools

Most Used Tools

⚙️

Core Tools

8 tools

✅

Validate JSON

Syntax check & format

🔐

JWT Decoder

Decode & verify tokens

🔀

JSON Diff

Compare two JSON objects

🔧

Repair JSON

Fix malformed JSON

📦

Minify JSON

Remove whitespace

🌲

Tree View

Visual JSON explorer

🎯

JSONPath Query

Query with JSONPath

📋

Schema Validator

Validate against schema

💻

Language Converters

10 tools

🔷

TypeScript

Generate TS interfaces

🐍

Python

Python dataclasses

☕

Java

Java POJO classes

🐹

Go

Go structs

🦀

Rust

Rust structs

🔵

C#

C# classes

🍎

Swift

Swift Codable structs

🎯

Kotlin

Kotlin data classes

🐘

PHP

PHP classes

💎

Ruby

Ruby structs

🔄

Format Converters

7 tools

📊

JSON ↔ CSV

Excel & spreadsheet ready

📝

JSON ↔ YAML

Config file format

🏷️

JSON ↔ XML

XML conversion

🗄️

JSON → SQL

Generate SQL INSERT

⬡

JSON → GraphQL

GraphQL schema

📡

JSON → Protobuf

Protocol buffer

📗

JSON → Excel

Download as .xlsx

🛠️

Utilities

8 tools

🔤

Sort Keys

Alphabetically sort

🔗

Merge JSON

Combine objects

🔍

Search & Extract

Find values by key

🔡

Base64 Encode

Encode / decode

📜

Stringify

JSON.stringify helper

🔒

Escape / Unescape

Escape special chars

📐

Flatten JSON

Nested → flat keys

🎲

Mock Data

Generate fake JSON

⚡

Advanced

6 tools

⏱️

Benchmark

Performance test

🚀

Optimizer

Reduce JSON size

🧩

Schema Generator

Auto-generate schema

🕵️

JSON Masking

Redact sensitive data

🔎

Duplicate Detector

Find duplicate keys

📦

Batch Validator

Validate multiple files

✨ What's New

🎯 Modern Dashboard

Beautiful new homepage with quick access to your favorites and recently used tools. Press Cmd+K for instant tool search!

🔒 Security Scanner

Automatic detection of XSS, SQL injection, PII, and security vulnerabilities in your JSON data.

📱 Mobile Optimized

Fully responsive design with hamburger menu, floating action button, and touch-friendly interface.

Why JSON Web Tools?

🔒

100% Privacy

All processing happens in your browser

⚡

Lightning Fast

No server delays, instant results

💎

Free Forever

No accounts, no limits, no cost

📱

Works Offline

PWA that works without internet

✅ Now Viewing

Validate JSON

Paste, type, upload file, or load from URL

Indent:

Drop JSON file here

{ }

Paste JSON or drag & drop a file

Load example JSON →

Repair JSON

Automatically fix malformed JSON

Minify JSON

Compress JSON by removing whitespace

JSON Diff

Compare two JSON objects

JSON 1

JSON 2

JSON Tree Viewer

Visualize JSON structure hierarchically

JSON Path Query

Extract data using JSONPath expressions

JSONPath Expression:

JSON Schema Validator

Validate JSON against a schema

JSON Data

JSON Schema

JWT Decoder

Decode and verify JSON Web Tokens

JSON to CSV

Convert JSON to CSV format

JSON to YAML

Convert JSON to YAML format

JSON to XML

Convert JSON to XML format

XML to JSON

Convert XML to JSON format

CSV to JSON

Convert CSV data to JSON array

YAML to JSON

Convert YAML to JSON format

JSON to Zod Schema

Generate Zod validation schema from JSON

JSON to Mongoose Schema

Generate Mongoose schema for MongoDB from JSON

JSON to SQL

Generate SQL INSERT statements

Table Name:

JSON to Excel

Convert JSON to Excel spreadsheet

JSON to Java

Generate Java classes from JSON

Class Name:

JSON to Python

Generate Python classes from JSON

Class Name:

JSON Stringify

Convert JavaScript object to JSON string

Pretty Print JSON

Format and beautify JSON

Indent:

JSON Escape / Unescape

Escape or unescape JSON strings

Sort JSON Keys

Alphabetically sort object keys

Flatten / Unflatten JSON

Convert nested JSON to flat structure and vice versa

Base64 Encode / Decode JSON

Encode JSON to Base64 or decode Base64 to JSON

URL Encode / Decode JSON

Encode JSON for URLs or decode URL-encoded JSON

Search JSON

Find keys or values in your JSON

Search for:

Merge JSON Objects

Combine multiple JSON objects into one

JSON 1 (Base)

JSON 2 (Override)

Mock Data Generator

Generate random JSON data for testing

Template: Count:

JSON to TypeScript

Generate TypeScript interfaces from JSON

Interface Name:

JSON to GraphQL Schema

Generate GraphQL type definitions from JSON

Type Name:

JSON to Go Struct

Generate Go structs from JSON

Struct Name:

JSON Patch (RFC 6902)

Apply JSON Patch operations to modify documents

Original JSON

Patch Operations

JSON Pointer (RFC 6901)

Navigate JSON using JSON Pointer syntax

JSON Pointer:

Batch JSON Validator

Validate multiple JSON files at once

📁

Drop multiple JSON files here or click to browse

JSON to Protobuf

Generate Protocol Buffer schema from JSON

Message Name:

Performance Benchmark

Measure JSON parse, stringify, and manipulation performance

Iterations:

JSON Optimizer

Get suggestions to reduce JSON size and improve performance

JSON to Rust

Generate Rust structs with Serde support

Struct Name:

JSON Schema Generator

Auto-generate JSON Schema from sample data

Mark all fields as required

Duplicate Key Detector

Find duplicate keys in JSON (JSON spec doesn't allow duplicates)

JSON to OpenAPI/Swagger

Generate OpenAPI schema from JSON response

Endpoint Path:

HTTP Method:

JSON to C#

Generate C# classes for .NET applications

Class Name:

JSON to Swift

Generate Swift structs for iOS/macOS development

Struct Name:

JSON to Kotlin

Generate Kotlin data classes for Android development

Class Name:

JSON to HTML Table

Convert JSON arrays to styled HTML tables

Include CSS Styling

JSON to Environment Variables

Convert JSON to .env file format and vice versa

Format:

JSON to TOML

Convert between JSON and TOML configuration format

JSON to PHP

Generate PHP classes for Laravel/Symfony applications

Class Name:

JSON to Ruby

Generate Ruby classes for Rails applications

Class Name:

Array Operations

Filter, map, sort, group, and transform JSON arrays

Operation:

Parameter:

Data Type Transformer

Convert data types in JSON (strings to numbers, etc.)

Convert string numbers to numbers Convert string booleans to booleans Convert empty strings to null

Nested Value Extractor

Extract deeply nested values using path notation

Extraction Path:

Use dot notation (user.name) or bracket notation (user['name']) or array index (users[0].name)

JSONPath Builder

Visual builder for JSONPath queries with live preview

Query Builder

JSON Masking & Redaction

Mask or redact sensitive data in JSON

Fields to Mask (comma-separated):

Masking Strategy:

JSON Size Analyzer

Detailed breakdown of JSON size by keys and types

Advanced JSON Merge

Merge JSON objects with different strategies

JSON 1 (Base)

JSON 2 (Override)

Merge Strategy:

JSON Formatter with Styles

Format JSON with different code styles and conventions

Formatting Style:

Quote Style:

JSON to Avro Schema

Generate Apache Avro schema from JSON

Schema Name: Namespace:

Custom JSON Validator

Define custom validation rules with JavaScript

JSON Data

Validation Rules (JavaScript)

Visual JSON Diff & Merge

Compare JSON with visual diff and interactive merge

Original JSON

Modified JSON

JSON to SQL Schema

Generate CREATE TABLE statements from JSON structure

Table Name:

Database Type:

JSON to Prisma Schema

Generate Prisma ORM schema from JSON

Model Name:

NDJSON/JSON Stream Parser

Parse newline-delimited JSON (NDJSON) streams

Output Format:

Webhook Payload Tester

Test webhook payloads and generate signatures

Webhook Secret (optional):

Signature Algorithm:

JSON to RegEx Pattern

Generate regex patterns to validate JSON structure

Strict matching (exact structure)

Import cURL Command

The Complete JSON Toolkit

⭐ Favorites

🕐 Recently Used

📊 Your Usage Stats

Most Used Tools

Core Tools

Validate JSON

JWT Decoder

JSON Diff

Repair JSON

Minify JSON

Tree View

JSONPath Query

Schema Validator

Language Converters

TypeScript

Python

Java

Go

Rust

C#

Swift

Kotlin

PHP

Ruby

Format Converters

JSON ↔ CSV

JSON ↔ YAML

JSON ↔ XML

JSON → SQL

JSON → GraphQL

JSON → Protobuf

JSON → Excel

Utilities

Sort Keys

Merge JSON

Search & Extract

Base64 Encode

Stringify

Escape / Unescape

Flatten JSON

Mock Data

Advanced

Benchmark

Optimizer

Schema Generator

JSON Masking

Duplicate Detector

Batch Validator

✨ What's New

🎯 Modern Dashboard

🔒 Security Scanner

📱 Mobile Optimized

Why JSON Web Tools?

100% Privacy

Lightning Fast

Free Forever

Works Offline

Validate JSON

Repair JSON

Minify JSON

JSON Diff

JSON 1

JSON 2

JSON Tree Viewer

JSON Path Query

JSON Schema Validator

JSON Data

JSON Schema

JWT Decoder

JSON to CSV

JSON to YAML

JSON to XML

XML to JSON

CSV to JSON

YAML to JSON

JSON to Zod Schema

JSON to Mongoose Schema

JSON to SQL