About jsonsmith.dev

A fast, beautiful, privacy-first JSON toolkit for developers. Format, validate, minify, diff, and convert JSON — entirely in your browser.

100% Client-Side

Your JSON data never leaves your browser. Zero network requests for processing. No server, no database, no data collection.

Instant Performance

All operations run locally in JavaScript. Format megabytes of JSON in milliseconds. No waiting for server responses.

Full-Featured Editor

Powered by Monaco (the engine behind VS Code). Syntax highlighting, bracket matching, code folding, and real-time validation.

Free Core Tools

No ads, no paywalls on core tools. Format, validate, minify, diff, and convert JSON — free, no sign-up required.

Why We Built This

Most online JSON formatters either send your data to a server, show intrusive ads, or both. After the jsonformatter.org security breach in November 2025, it became clear that developers need a JSON tool they can trust.

jsonsmith.dev is our answer: a modern, open, privacy-first toolkit where your data stays exactly where it should — in your browser.

Tools Included

Core JSON Tools

JSON Formatter — Format and pretty-print JSON with configurable indentation
JSON Validator — Validate JSON syntax with line and column feedback
JSON Minifier — Compress JSON by removing unnecessary whitespace
JSON Tree Viewer — Explore JSON in a searchable, collapsible tree
JSON Diff — Compare two JSON documents side by side
JSON Beautifier — Beautify JSON for easier reading and review
JSON Editor — Edit, format, upload, download, and share JSON locally

Utilities

JSON Repair — Repair malformed JSON and normalize valid input
JSON Stringify — Escape or unescape JSON strings for source code
JSON Path Finder — Find values with JSONPath-style queries
JWT Decoder — Decode JWT headers and payloads in the browser

Converters

JSON to YAML — Convert JSON into YAML
YAML to JSON — Convert YAML into JSON
JSON to CSV — Flatten JSON arrays into CSV
CSV to JSON — Convert CSV rows into JSON
XML to JSON — Convert XML documents into JSON
JSON to XML — Convert JSON objects into XML

Code Generators

JSON to TypeScript — Generate TypeScript interfaces from JSON
JSON to Zod — Generate Zod schemas from JSON
JSON to Pydantic — Generate Pydantic models from JSON
JSON Schema Generator — Generate JSON Schema from sample data
JSON to Go — Generate Go structs from JSON

Resources

JSON Cheat Sheet — Review JSON syntax, data types, and escaping rules
About — Learn how jsonsmith.dev handles privacy and data
JSON Error Guide — Understand common JSON parse errors and fixes

More from Starmorph

jsonsmith.dev is built and maintained by Starmorph. If you find it useful, check out our other tools: Mermaid Editor — a free online Mermaid diagram editor with AI assistance, and Pixelmuse — an AI image studio for thumbnails and product art.

Keyboard Shortcuts

Shortcut	Action
`Ctrl+Shift+F`	Format / Beautify JSON
`Ctrl+Shift+M`	Minify / Compact JSON