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
