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Beautify and format JSON with indentation

Find syntax errors with line and column numbers

Duplicate keys, mixed naming, inconsistent array shapes

Compress JSON and see exact bytes saved

Fix broken JSON — trailing commas, single quotes, comments

Compare two JSON objects, see differences

Escape JSON to a string literal or unescape it

Flatten nested JSON to dot-notation or unflatten back

Keep or remove specific keys from a JSON object

Sort a JSON array of objects by any field, asc or desc

Deep merge two JSON objects, or 3-way merge with conflict picking

Visual breakdown of which JSON keys use the most bytes

Validate JSON data against a JSON Schema

Test JSONPath expressions and see all matches — or build one with no syntax

Diff two JSON documents into an RFC 6902 patch, or apply one

Generate TypeScript interfaces from a JSON Schema

Generate TypeScript types from a GraphQL schema (SDL)

Generate TypeScript interfaces from an OpenAPI / Swagger spec

Export arrays to spreadsheet-ready CSV

Import CSV files and convert to JSON arrays

Human-readable config format, bidirectional

Convert YAML configs to JSON instantly

Well-formed XML with configurable root tag

Parse XML and convert to a JSON object

Generate TypeScript interfaces from any JSON

Generate Go structs with json tags from JSON

Generate Zod validation schemas from JSON

Generate CREATE TABLE + INSERT SQL from JSON

Generate Go testify, Jest, and pytest fixtures

Generate MongoDB BSON code for Go, Node.js, Python

Generate @dataclass, TypedDict, or Pydantic v2 from JSON

Infer JSON Schema Draft 2020-12 from any JSON object

Build a JSON Schema from scratch — no sample JSON needed

Generate serde Serialize/Deserialize Rust structs from JSON

Generate Kotlin data classes with @JsonProperty annotations

Generate Java POJO classes — Jackson or Lombok @Data

Generate C# classes for System.Text.Json or Newtonsoft.Json

Generate Swift Codable structs with CodingKeys mapping

Generate Dart classes with fromJson/toJson for Flutter

Generate Mongoose Schema definitions from JSON objects

Convert JSON arrays to GitHub Markdown tables

Convert JSON arrays to styled HTML tables

Convert JSON arrays to NDJSON and parse NDJSON back

Generate CREATE TABLE + INSERT SQL from CSV — 4 dialects

Convert Cargo.toml, pyproject.toml and other TOML files to JSON

Convert JSON objects to TOML configuration format

Generate PHP 8 typed classes with a fromArray() hydrator

Generate a proto3 message or Avro record schema from JSON

Convert a JSON array of objects to a downloadable .xlsx file

Convert an Excel or CSV file to a JSON array of objects

Generate strong, secure random passwords

Encrypt and decrypt text with AES-256-GCM and a passphrase

Generate an RSA public/private key pair in PEM format

Convert any title into a clean URL-safe slug

Count words, characters, sentences and reading time

Encode or decode Base64 — Standard, URL-safe, Raw

Encode or decode URLs — query, path, form encoding

Escape and unescape HTML entities for XSS prevention

SHA-256, SHA-512, SHA-1 hashes and HMAC signatures

Generate UUID v4 and v7 identifiers in bulk

Convert between decimal, hex, binary, and octal

Generate realistic mock JSON data with custom fields

Query and transform JSON with the full jq language

Explore JSON visually as an interactive node graph

Visualize JSON as a tree diagram or Mermaid flowchart

Convert Unix timestamps to human-readable dates

Test regex patterns with match highlighting and RE2 notes

Convert cURL commands to Go, Python, JS, PHP, Ruby

Send REST requests and view JSON responses in a tree

Turn a captured HAR file into a starting OpenAPI spec

Embed an interactive JSON tree on any site with one iframe

Convert .env files to JSON and JSON back to .env

Compare two text blocks line by line with diff highlighting

Build and sign JSON Web Tokens with HS256, HS384, or HS512

Parse cron expressions, get human-readable description and next 10 run times

Decode tokens, check expiry, inspect claims

Convert between camelCase, snake_case, kebab-case, PascalCase and more

Break any URL into protocol, host, path and query parameters

Convert colors between HEX, RGB, HSL and named colors with a live swatch

Beautify, re-indent and validate YAML

Beautify or minify XML and check it is well-formed

Convert CSS declarations to Tailwind utility classes

Convert SVG markup into a React JSX component

Beautify and minify SQL with clause line-breaks and keyword casing

Beautify or minify HTML with clean indentation and bytes saved

Beautify or minify CSS and see exactly how many bytes you saved

Beautify JS/TS or minify with terser and see bytes saved

Live GitHub-flavored Markdown preview with tables and task lists

Render Mermaid flowcharts, sequence and ER diagrams — export SVG/PNG

Convert HTML to React JSX — class→className, styles and self-closing tags

Generate placeholder text — paragraphs, sentences or words

Convert an image to a Base64 data URI for CSS, HTML or JSON

Generate QR codes from text or URLs — download PNG or SVG

Turn code or JSON into a beautiful shareable image (PNG)

Plain English to a jq filter and JSONPath expression

Explain any JSON Schema in plain English with AI

Fix, explain, convert & generate JSON, mock data, schema, queries and regex with AI

Generate a regex from plain English, or explain any regex with AI

Turn plain English into SQL for Postgres, MySQL, SQLite or SQL Server

Generate realistic JSON test data from a description with AI

Convert a plain-English schedule into a cron expression with AI

How to parse JSON in every major language

JavaScript has native JSON support built in through the global JSON object. Use JSON.pa…

Python ships with the json module in the standard library. Use json.loads/json.load to …

Go's standard library provides encoding/json. Decode JSON into structs (recommended) or…

Java has no built-in JSON parser, but Jackson is the de-facto standard. Use ObjectMappe…

Modern .NET includes System.Text.Json. Use JsonSerializer to bind JSON to classes/recor…

PHP has built-in json_decode and json_encode functions. Decode to associative arrays or…

Ruby's standard library includes json. Require it, then use JSON.parse to read and JSON…

Rust uses the serde + serde_json crates. Derive Serialize/Deserialize on your structs, …

TypeScript uses the same JSON.parse as JavaScript, but the result is typed as any. Add …

kotlinx.serialization is Kotlin's official, multiplatform JSON library. Annotate a data…

Swift uses the Codable protocol with JSONDecoder and JSONEncoder from Foundation. Confo…

C++ has no standard JSON parser, but nlohmann/json (a single header) is the most popula…

Bash has no built-in JSON parser — use jq, the standard command-line JSON processor. Pi…

PowerShell has built-in ConvertFrom-Json and ConvertTo-Json cmdlets. Convert JSON text …

JSON guides, tutorials, and error fixes

Copy-ready JSON examples for common data structures

Learn JSON Schema step by step across 6 lessons

Quick reference for JSON syntax and types

Beginner guide to the JSON data format

Side-by-side comparison of JSON and YAML

When to use JSON vs XML for data exchange

Choosing between JSON and CSV for your data

Comments, trailing commas — JSON5 vs strict JSON

Text vs binary serialization trade-offs

Choosing a human-friendly config format

Complete three-way format comparison

How JWT works — header, payload, signature

Tools and methods for validating JSON data

Complete reference for HTTP status codes

Reference for common HTTP request/response headers

Cron syntax reference with common schedules

UUID versions explained — v1, v4, v7 and more

How JSONKit compares to JSONCrack

JSONKit homepage — all tools at a glance

About JSONKit and our mission

Format JSON responses right in your browser

How we handle your data

Terms and conditions of use