# JSONKit

> Free online JSON tools for developers. Format, validate, minify, convert, diff and transform JSON entirely in your browser — instant, accurate and 100% private. No account required. No data ever sent to any server.

## Tools

### JSON Tools
- [JSON Formatter](https://jsonkit.in/json-formatter) — Beautify and format JSON with syntax highlighting, collapsible tree view and live error detection
- [JSON Validator](https://jsonkit.in/json-validator) — Validate JSON and find syntax errors with exact line and column numbers — validates as you type
- [JSON Minifier](https://jsonkit.in/json-minifier) — Compress JSON, remove all whitespace and see exact bytes saved and percentage reduction

### Format Converters
- [JSON to CSV](https://jsonkit.in/json-to-csv) — Convert JSON arrays to spreadsheet-ready CSV with live table preview and custom delimiters
- [CSV to JSON](https://jsonkit.in/csv-to-json) — Import CSV files or paste CSV text and convert to JSON arrays instantly
- [JSON to YAML](https://jsonkit.in/json-to-yaml) — Convert JSON to human-readable YAML config format — bidirectional with swap button
- [YAML to JSON](https://jsonkit.in/yaml-to-json) — Convert YAML configuration files to JSON objects instantly
- [JSON to XML](https://jsonkit.in/json-to-xml) — Convert JSON to well-formed XML with configurable root tag and proper character escaping
- [XML to JSON](https://jsonkit.in/xml-to-json) — Parse XML and convert to a clean JSON object

### Code Generators
- [JSON to TypeScript](https://jsonkit.in/json-to-typescript) — Generate TypeScript interfaces from any JSON, handling nested objects, arrays and optional fields
- [JSON to Go Struct](https://jsonkit.in/json-to-go) — Generate Go structs with json struct tags from any JSON object
- [JSON to Zod Schema](https://jsonkit.in/json-to-zod) — Generate Zod validation schemas with TypeScript type exports from JSON
- [JSON to SQL](https://jsonkit.in/json-to-sql) — Generate CREATE TABLE and INSERT SQL statements from JSON arrays — MySQL, PostgreSQL, SQLite, SQL Server
- [JSON to Test Fixtures](https://jsonkit.in/json-to-test) — Generate Go testify, Jest and pytest test fixtures from JSON
- [JSON to BSON](https://jsonkit.in/json-to-bson) — Generate MongoDB BSON document code for Go, Node.js and Python
- [JSON to Python](https://jsonkit.in/json-to-python) — Generate Python @dataclass, TypedDict or Pydantic v2 BaseModel from JSON
- [JSON Schema Generator](https://jsonkit.in/json-schema-generator) — Infer JSON Schema Draft 2020-12 from any JSON object — types, required fields and string format detection
- [JSON to Rust Struct](https://jsonkit.in/json-to-rust) — Generate serde Serialize/Deserialize Rust structs with field mapping from JSON
- [JSON to Kotlin Data Class](https://jsonkit.in/json-to-kotlin) — Generate Kotlin data classes with @JsonProperty annotations from JSON
- [JSON to Java POJO](https://jsonkit.in/json-to-java) — Generate Java POJO classes with Jackson or Lombok @Data annotations from JSON
- [JSON to C# Class](https://jsonkit.in/json-to-csharp) — Generate C# classes for System.Text.Json or Newtonsoft.Json from JSON
- [JSON to Swift Struct](https://jsonkit.in/json-to-swift) — Generate Swift Codable structs with CodingKeys mapping from JSON
- [JSON to Dart Class](https://jsonkit.in/json-to-dart) — Generate Dart classes with fromJson/toJson methods for Flutter from JSON
- [JSON to Mongoose Schema](https://jsonkit.in/json-to-mongoose) — Generate Mongoose Schema definitions for Node.js/MongoDB from JSON objects
- [JSON to Markdown Table](https://jsonkit.in/json-to-markdown) — Convert JSON arrays to GitHub-flavored Markdown tables
- [JSON to HTML Table](https://jsonkit.in/json-to-html-table) — Convert JSON arrays to styled HTML tables with inline CSS
- [JSON Lines / NDJSON](https://jsonkit.in/json-lines) — Convert JSON arrays to NDJSON (one object per line) and parse NDJSON back to arrays
- [CSV to SQL](https://jsonkit.in/csv-to-sql) — Generate CREATE TABLE and INSERT SQL from CSV files — 4 SQL dialects

### Developer Utilities
- [JSON Diff](https://jsonkit.in/json-diff) — Compare two JSON objects side-by-side and see every added, removed and changed key with semantic diff
- [JWT Decoder](https://jsonkit.in/jwt-decoder) — Decode JWT tokens and inspect header, payload and expiry — no secret key needed, runs in browser
- [JSON Schema Validator](https://jsonkit.in/json-schema-validator) — Validate JSON data against a JSON Schema with field-level error paths and constraint keywords
- [JSONPath Tester](https://jsonkit.in/json-path-tester) — Evaluate JSONPath expressions against JSON data with wildcards, filters and recursive descent
- [JSON Escape / Unescape](https://jsonkit.in/json-escape) — Escape JSON into a safe string literal or unescape a JSON string back to readable JSON
- [JSON Flatten / Unflatten](https://jsonkit.in/json-flatten) — Flatten nested JSON to dot-notation keys or unflatten back to nested JSON
- [JSON Fixer / Auto-Repair](https://jsonkit.in/json-fixer) — Automatically fix broken JSON — trailing commas, single quotes, unquoted keys and comments
- [Random JSON Generator](https://jsonkit.in/random-json) — Generate realistic mock JSON data with configurable fields, types and constraints

### Encoding and Hashing
- [Base64 Encoder / Decoder](https://jsonkit.in/base64) — Encode or decode Base64 — Standard, URL-safe and Raw variants with code snippets for 5 languages
- [URL Encoder / Decoder](https://jsonkit.in/url-encoder) — Encode or decode URLs — query string, path and form encoding with code snippets
- [Hash Generator](https://jsonkit.in/hash-generator) — Generate SHA-256, SHA-512, SHA-1 hashes and HMAC signatures with code snippets for 5 languages
- [HTML Escape / Unescape](https://jsonkit.in/html-escape) — Escape and unescape HTML entities for XSS prevention and template rendering
- [Number Base Converter](https://jsonkit.in/number-base) — Convert numbers between decimal, hexadecimal, binary and octal

### General Tools
- [UUID Generator](https://jsonkit.in/uuid-generator) — Generate UUID v4 (random) and v7 (time-sortable) identifiers in bulk
- [Unix Timestamp Converter](https://jsonkit.in/unix-timestamp) — Convert Unix timestamps to human-readable dates and vice versa
- [Regex Tester](https://jsonkit.in/regex-tester) — Test regular expression patterns with match highlighting, capture groups and RE2 compatibility notes
- [cURL to Code](https://jsonkit.in/curl-to-code) — Convert cURL commands to idiomatic HTTP client code in Go, Python, JavaScript, PHP and Ruby
- [ENV ↔ JSON](https://jsonkit.in/env-parser) — Convert .env environment variable files to JSON and JSON back to .env format
- [Text Diff](https://jsonkit.in/text-diff) — Compare two text blocks line by line with diff highlighting

## Reference Pages

- [JSON Examples Library](https://jsonkit.in/json-example) — 28 copy-ready JSON examples for common API and data structures
- [JSON Cheat Sheet](https://jsonkit.in/json-cheat-sheet) — Quick reference for JSON syntax, data types and common patterns
- [JSON vs YAML](https://jsonkit.in/json-vs-yaml) — Side-by-side comparison of JSON and YAML formats with use cases
- [JSON vs XML](https://jsonkit.in/json-vs-xml) — Comparison of JSON and XML data formats with conversion examples
- [JSON vs CSV](https://jsonkit.in/json-vs-csv) — When to use JSON vs CSV with format comparison
- [HTTP Status Codes](https://jsonkit.in/http-status-codes) — Complete reference for all HTTP status codes with REST API context
- [UUID Guide](https://jsonkit.in/uuid-guide) — Complete guide to UUID versions and when to use each

## JSON Examples

- [User Profile JSON](https://jsonkit.in/json-example/user-profile)
- [E-commerce Order JSON](https://jsonkit.in/json-example/ecommerce-order)
- [Product Listing JSON](https://jsonkit.in/json-example/product-listing)
- [REST API Response JSON](https://jsonkit.in/json-example/api-response)
- [JWT Payload JSON](https://jsonkit.in/json-example/jwt-payload)
- [Pagination Response JSON](https://jsonkit.in/json-example/pagination)
- [API Error Response JSON](https://jsonkit.in/json-example/error-response)
- [Blog Post JSON](https://jsonkit.in/json-example/blog-post)
- [Address JSON](https://jsonkit.in/json-example/address)
- [Invoice JSON](https://jsonkit.in/json-example/invoice)
- [Employee Record JSON](https://jsonkit.in/json-example/employee-record)
- [Calendar Event JSON](https://jsonkit.in/json-example/calendar-event)
- [Geolocation JSON](https://jsonkit.in/json-example/geolocation)
- [App Config JSON](https://jsonkit.in/json-example/app-config)
- [Webhook Event JSON](https://jsonkit.in/json-example/webhook-event)
- [Restaurant Menu JSON](https://jsonkit.in/json-example/restaurant-menu)
- [Social Media Post JSON](https://jsonkit.in/json-example/social-media-post)
- [Weather Data JSON](https://jsonkit.in/json-example/weather-data)
- [Payment Transaction JSON](https://jsonkit.in/json-example/payment-transaction)
- [Push Notification JSON](https://jsonkit.in/json-example/push-notification)
- [HTTP Status Codes JSON](https://jsonkit.in/json-example/http-status-codes)
- [Programming Languages JSON](https://jsonkit.in/json-example/programming-languages)
- [Feature Flags JSON](https://jsonkit.in/json-example/feature-flags)
- [GraphQL API Response JSON](https://jsonkit.in/json-example/graphql-response)
- [Search API Response JSON](https://jsonkit.in/json-example/search-results)
- [Audit Log Entry JSON](https://jsonkit.in/json-example/audit-log)
- [TypeScript Config JSON](https://jsonkit.in/json-example/tsconfig)
- [JSON Form Schema](https://jsonkit.in/json-example/form-schema)

## Blog

- [Blog index](https://jsonkit.in/blog) — JSON tutorials, tips and developer guides
- [What is JSON?](https://jsonkit.in/blog/what-is-json)
- [JSON vs XML vs YAML — Which Should You Use?](https://jsonkit.in/blog/json-vs-xml-vs-yaml)
- [How to Validate JSON — 5 Methods Explained](https://jsonkit.in/blog/how-to-validate-json)
- [How to Format JSON Online — The Complete Guide](https://jsonkit.in/blog/json-formatter-guide)
- [JWT Tokens Explained — How They Work and How to Decode Them](https://jsonkit.in/blog/jwt-tokens-explained)
- [How to Use JSONKit Formatter — Complete Feature Guide](https://jsonkit.in/blog/how-to-use-json-formatter)
- [JSON Live Validation — How It Works and Why It Matters](https://jsonkit.in/blog/json-live-validation-explained)
- [JSON Minify vs Format — When to Use Each](https://jsonkit.in/blog/json-minify-vs-format)
- [JSONKit Keyboard Shortcuts and Power User Tips](https://jsonkit.in/blog/json-keyboard-shortcuts)
- [JSON Validator — How to Find and Fix JSON Errors](https://jsonkit.in/blog/json-validator-complete-guide)
- [JSON Minifier — How to Compress JSON and Save Bandwidth](https://jsonkit.in/blog/json-minifier-guide)
- [JSON to CSV — How to Convert JSON Arrays to Spreadsheets](https://jsonkit.in/blog/json-to-csv-guide)
- [JSON to YAML — Complete Conversion Guide with Examples](https://jsonkit.in/blog/json-to-yaml-guide)
- [JSON to XML Converter — How It Works and When to Use It](https://jsonkit.in/blog/json-to-xml-guide)
- [JSON Diff: How to Compare Two JSON Objects](https://jsonkit.in/blog/json-diff-guide)
- [JWT Tokens — How to Decode and Inspect Them Safely](https://jsonkit.in/blog/jwt-decoder-guide)
- [JSON Parse Errors: How to Fix Every Common Syntax Error](https://jsonkit.in/blog/json-parse-errors-guide)
- [JSON in JavaScript: parse, stringify, fetch and localStorage](https://jsonkit.in/blog/json-in-javascript-guide)
- [JSON Schema Validation: Complete Guide with Examples](https://jsonkit.in/blog/json-schema-validation-guide)
- [JSON API Best Practices: Design Clean API Responses](https://jsonkit.in/blog/json-api-best-practices)
- [JSON in Python: Complete Guide with Examples](https://jsonkit.in/blog/json-in-python-guide)
- [JSONPath: Query JSON Data Like a Pro](https://jsonkit.in/blog/jsonpath-guide)
- [Fix: Unexpected token < in JSON at position 0](https://jsonkit.in/blog/unexpected-token-json-position-0)
- [Fix: Unexpected end of JSON input](https://jsonkit.in/blog/unexpected-end-of-json-input)
- [Fix: Converting circular structure to JSON](https://jsonkit.in/blog/json-circular-structure-error)
- [Fix: CORS error fetching JSON from API](https://jsonkit.in/blog/cors-error-json-api)
- [Fix: 415 Unsupported Media Type JSON errors](https://jsonkit.in/blog/415-unsupported-media-type-json)
- [Parsing large JSON files without crashing](https://jsonkit.in/blog/json-stringify-parse-large-files)
- [null vs undefined in JSON handling](https://jsonkit.in/blog/json-null-undefined-handling)
- [JSON Has No Comments — JSONC and JSON5 Guide](https://jsonkit.in/blog/json-comments-jsonc-json5)
- [20 Common JSON Mistakes and How to Avoid Them](https://jsonkit.in/blog/json-common-mistakes)
- [NDJSON and JSON Lines: Streaming Large JSON Datasets](https://jsonkit.in/blog/ndjson-json-lines)
- [JSON Patch vs JSON Merge Patch (RFC 6902 & 7396)](https://jsonkit.in/blog/json-patch-merge-patch)
- [Using JSON in Databases: MySQL, PostgreSQL, and MongoDB](https://jsonkit.in/blog/json-in-databases)
- [JSON to TypeScript: Generate Interfaces from JSON](https://jsonkit.in/blog/json-to-typescript-interfaces)
- [CSV to JSON Conversion Guide](https://jsonkit.in/blog/csv-to-json-guide)
- [YAML to JSON Conversion Guide](https://jsonkit.in/blog/yaml-to-json-guide)
- [XML to JSON Conversion Guide](https://jsonkit.in/blog/xml-to-json-guide)
- [JSON Escape and Unescape Guide](https://jsonkit.in/blog/json-escape-unescape-guide)
- [JSON to Go Struct Guide](https://jsonkit.in/blog/json-to-go-struct-guide)
- [JSON to Zod Schema Guide](https://jsonkit.in/blog/json-to-zod-schema-guide)
- [JSON to SQL Guide](https://jsonkit.in/blog/json-to-sql-guide)
- [Base64 Encoding and Decoding Guide](https://jsonkit.in/blog/base64-encoding-guide)
- [URL Encoding and Decoding Guide](https://jsonkit.in/blog/url-encoding-guide)
- [SHA-256 and HMAC Hash Generator Guide](https://jsonkit.in/blog/sha256-hmac-guide)
- [cURL to Code Conversion Guide](https://jsonkit.in/blog/curl-to-code-guide)
- [Unix Timestamp Conversion Guide](https://jsonkit.in/blog/unix-timestamp-guide)
- [Regular Expressions Guide](https://jsonkit.in/blog/regex-guide)
- [JSON Schema Generation Guide](https://jsonkit.in/blog/json-schema-guide)
- [JSON to Python Class Guide](https://jsonkit.in/blog/json-to-python-guide)
- [JSON Flatten and Unflatten Guide](https://jsonkit.in/blog/json-flatten-guide)
- [Mock JSON Data Generation Guide](https://jsonkit.in/blog/json-mock-data-guide)
- [UUID v4 vs UUID v7 Guide](https://jsonkit.in/blog/uuid-v4-vs-v7-guide)
- [HTTP Status Codes Complete Guide](https://jsonkit.in/blog/http-status-codes-guide)
- [JSON to Java and Kotlin Guide](https://jsonkit.in/blog/json-to-java-kotlin-guide)
- [JSON to Swift and Dart Guide](https://jsonkit.in/blog/json-to-swift-dart-guide)
- [JSON Schema Generator Guide](https://jsonkit.in/blog/json-schema-generator-guide)
- [JSON in Node.js: File I/O, HTTP Servers, and Streams](https://jsonkit.in/blog/json-in-nodejs-guide)
- [JSON in TypeScript: Type Safety, Generics, and Runtime Validation](https://jsonkit.in/blog/json-typescript-complete-guide)
- [JSON Security: Injection, Deserialization Attacks, and Safe Parsing](https://jsonkit.in/blog/json-security-guide)
- [JSON Performance: Optimization Tips for APIs and Applications](https://jsonkit.in/blog/json-performance-tips)
- [JSON Data Modeling: Designing Schemas for Real-World Applications](https://jsonkit.in/blog/json-data-modeling-guide)

## JSON Examples by Category

### IoT & Sensors
- [IoT Device Telemetry JSON](https://jsonkit.in/json-example/device-telemetry)
- [Smart Home Event JSON](https://jsonkit.in/json-example/smart-home-event)

### Social
- [Social Media Post JSON](https://jsonkit.in/json-example/social-post)
- [Notification Object JSON](https://jsonkit.in/json-example/notification)

### Finance
- [Bank Transaction JSON](https://jsonkit.in/json-example/bank-transaction)

### Healthcare
- [Patient Medical Record JSON](https://jsonkit.in/json-example/patient-record)

## Key Facts

- All tools run entirely in the browser using native JavaScript APIs
- No data is ever sent to any server — paste production secrets without risk
- 100% free, no account or sign-up required
- Works offline after the first visit
- Supports files up to several megabytes without slowdown
- Compatible with Chrome, Firefox, Safari and Edge
- 47+ tools available across JSON, conversion, code generation and developer utilities
- 62 blog posts covering JSON fundamentals, API design, security, performance, and language-specific guides
- JSON Examples library with 34+ copy-ready templates across API Design, E-commerce, Authentication, Business, Data, Content, DevOps, IoT, Social, Finance, and Healthcare
- Founded 2024