ParseBox

Convert JSON, YAML, XML, CSV, TOML and 20+ other formats in your browser. Decode JWT, Base64 and URL encoding, and generate TypeScript, Zod, Go, Rust, Python and other types from a sample.

→ parsebox.app

Private by design

ParseBox runs entirely in your browser. Your text is never uploaded, logged or stored on a server, so it is safe to paste API responses, tokens and .env files.

Features

• Auto detect: paste anything, and ParseBox finds the format.
• Decode chain: peels Base64, URL encoding, gzip and JWT layers until it reaches the data inside.
• JSON repair: fixes trailing commas, single quotes and missing quotes, and shows the line of any error that remains.
• Loss report: tells you what the target format cannot keep, such as comments, dates, or nested objects in a CSV cell.
• Secret detection: finds API keys and passwords, and can mask them in the output.
• Type generation: TypeScript, Zod, JSON Schema, Go, Protobuf, Rust (serde), Python (Pydantic), C#, Kotlin, Swift and Java.
• Large files: conversion runs in a Web Worker, so the page stays responsive.
• Find: search the input or the output with Ctrl+F (⌘F on a Mac), with match case and regex options.

Formats

Group	Formats
Data	Plain text, JSON, JSON5, XML, YAML, TOML, TOON, INI, dotenv, CSV, TSV, JSONL, query string
Encodings	MessagePack, Base64, hexadecimal, binary, URI encoding, JWT (input only)
Types & schemas (output only)	TypeScript, Zod, JSON Schema, Go, Protobuf, Rust, Python, C#, Kotlin, Swift, Java

Popular conversions have their own pages, for example JSON to YAML, CSV to JSON, JSON to TypeScript and JWT decoder.

Development

pnpm install
pnpm dev        # dev server at http://localhost:5173
pnpm test       # node --test; needs Node 22.6 or later
pnpm build      # type-check, build, and write the landing pages to dist/

• The landing pages are listed in src/seo/pages.ts.
• At build time, src/seo/vite-plugin.ts writes one static HTML file per page, plus sitemap.xml, llms.txt and 404.html.

License

MIT