Local only

08:15

Local JSON Toolbox

Format · Tree view · Convert · Codegen · JWT — runs locally in your browser, zero upload

JSON フォーマット

Focus mode (hide other page content)

Raw input

Parsed output

Fixed height; long code scrolls inside the panel

CORE CAPABILITIES

20 tools in one place

From daily formatting to JWT verification—cover the full JSON workflow without juggling multiple sites.

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JSON processing

Format, minify, validate, diff, path query, merge & clean—six tools for everyday JSON work.

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Format conversion

Two-way conversion between YAML, XML, CSV, SQL, query strings, Postman Collection, and JSON.

コード生成

Generate TypeScript, Java, and Go types from JSON Schema in one click—speed up API integration.

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Visualize

Tree view, mind map, and Lottie preview make nested structures easy to read.

JWT

Security tools

Decode, sign, and verify JWT—keys are handled locally only; nothing is uploaded.

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Instant response

Process as you type with millisecond feedback. Drag-and-drop import, local history, one-click copy & export.

USE CASES

Who uses JSONSort?

Frontend, backend, or ops—there is a tool for you.

Frontend developers

Debug API responses, format mock data, generate TS types, preview Lottie assets.

Backend developers

Convert YAML configs, generate SQL DDL, debug and verify JWT tokens.

QA engineers

Convert Postman collections, JSON diff, parse and build query parameters.

OPS

Ops / DevOps

Format log JSON, merge and clean configs—sensitive data stays local.

HOW IT WORKS

Get started in 3 steps

No sign-up—open and go

Pick a tool

Choose from the toolbar or filter by category. Twenty JSON tools in one suite.

Paste or import data

Paste JSON, drag a file into the workspace, or load demo data with Sample. Supports .json, .yaml, .csv, .xml, and more.

Review and export

Preview results live, copy to clipboard, or export to a file. Actions are saved in local history.

WHY LOCAL

Local vs online tools

Comparison

JSONSort (local)

Typical online tools

Data upload

Zero upload—runs in the browser

Sent to remote servers

Response speed

Milliseconds, no network latency

Limited by bandwidth

Sensitive data

Keys / tokens never leave your device

Leak risk

Works offline

Yes (after cache)

Requires internet

FAQ

Will my data be uploaded to a server? +

No. JSONSort is a pure frontend app—all parsing, formatting, and encryption run locally in your browser. Data never leaves your device.

Which file formats can I import? +

Supports .json, .json5, .txt, .csv, .xml, .sql, .xlsx, .xls, .lottie, and more—or paste text directly.

Where is local history stored? +

History is stored in browser localStorage on this device only. Open it from the history icon in the workspace toolbar.

How large a JSON file can it handle? +

Depends on browser memory; multi-MB JSON is usually fine. For very large files, use Merge & Clean to drop redundant fields first.

Do I need to install or sign up? +

No. Open the page and use every feature—no account, no install, and no network required after the first load.

Zero data leaks

Pure frontend architecture—why we need local-first tools

01. True sandbox

All parsing, formatting, and encryption runs in JavaScript inside your local sandbox. Your data, keys, and business logic never touch any server.

02. Millisecond response

Without network latency, the toolkit delivers true type-and-see feedback—from huge log streams to complex config objects, the browser engine renders fast.

03. Open & transparent

All logic runs in the browser with clear, auditable code. No third-party trackers and no behavioral analytics.

04. Offline ready

After the first load, assets cache locally so you can format JSON, decode JWT, and convert YAML offline.