100% client-side — no data leaves your browser

JSON & CSV Tools
for developers

Ten fast, free utilities that run entirely in your browser. Format, validate, convert, diff, and explore JSON without any backend.

Private by design Zero latency No install Works offline

Instant Processing

Results appear as you type — no round-trips, no waiting.

Fully Private

All processing happens in your browser. Your data is never sent anywhere.

Mobile-Ready

Responsive input/output panes work on phones and tablets.

Works Offline

Once cached by your browser, no internet connection is needed.

All 10 Tools

Beautify minified JSON with configurable indentation and syntax highlighting. Includes built-in validation.

Check JSON syntax and get exact line-and-column error positions with human-readable messages.

Strip whitespace and comments. Displays before/after size and exact compression percentage.

JSON Diff Checker

Side-by-side structural comparison of two JSON documents with colour-coded added, removed, and changed keys.

Flatten JSON arrays to a downloadable .csv spreadsheet. Handles nested objects with dot-notation headers.

Convert CSV files to formatted JSON. Auto-detects delimiters, handles quoted fields, and infers types.

JSON to TypeScript

Generate typed interface or type declarations from JSON. Optional Zod schema output included.

JSONPath Tester

Evaluate JSONPath expressions against live data. Supports $, .., [*], slices, and filter expressions.

JSON Schema Generator

Infer a JSON Schema draft-07 document from any JSON sample. Outputs type, required, and properties.

JSON Tree Viewer

Navigate JSON as a collapsible, searchable tree with type labels and node counts at every level.

JSON2X — Tool Guide

Every tool on this site is free, requires no sign-up, and runs 100% inside your browser. Here's a quick guide to which tool fits which task.