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 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.
- 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.
| 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.
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.tswrites one static HTML file per page, plussitemap.xml,llms.txtand404.html.