About Jsonic

What is Jsonic?

Jsonic is a free, browser-based toolkit for working with JSON and developer data formats. It includes a JSON formatter, validator, and minifier; converters from JSON to TypeScript, CSV, YAML, and TOML; a structural JSON diff tool; a JWT decoder; and Base64 and URL encode/decode utilities. All ten tools run entirely client-side — no data leaves your browser.

Jsonic was built for developers who work with APIs, configuration files, and data pipelines and need reliable, privacy-respecting utilities they can use without uploading sensitive payloads to unknown servers. There is no account, no sign-up, and no tracking.

Tools

• JSON FormatterFormat, validate, and minify JSON
• JSON → TypeScriptGenerate TypeScript interfaces from JSON
• JSON → CSVConvert JSON arrays to CSV
• JSON → YAMLConvert JSON to YAML format
• JSON → TOMLConvert JSON to TOML format
• CSV → JSONConvert CSV to a JSON array
• JSON DiffCompare two JSON objects structurally
• JWT DecoderDecode and inspect JWT tokens
• Base64 Encode / DecodeEncode or decode Base64 strings
• URL Encode / DecodePercent-encode or decode URL strings

Who builds Jsonic

Jsonic is built and maintained by T Studio, an independent studio focused on shipping privacy-respecting developer tools and reference content for engineers who work with JSON, APIs, and configuration data.

T Studio is solo-run, has no investors, and does not collect or sell user data. If you find Jsonic useful and want to help cover hosting and continued maintenance, you can send a one-time supporter contribution from the Support page — every Jsonic tool stays free regardless.

Privacy

All processing happens in your browser using JavaScript. Your JSON, tokens, and other inputs never leave your device. Read our full Privacy Policy.

Contact

Questions or feedback? Reach us at support@jsonic.io.