Free Online Developer Tools — JSON, JWT & Base64

Everyday developer utilities that run entirely in your browser — nothing you paste here is ever sent to a server.

Encode and decode text or files, with automatic URL-safe detection and a one-click handoff for decoded JSON.

Format, validate, auto-repair, search, and inspect JSON — with precise line and column error locations.

Decode, encode, and verify JSON Web Tokens — HMAC, RSA, and ECDSA.

Free developer tools that run entirely in your browser

Objectparse is a growing collection of everyday utilities for working with JSON, JWTs, and Base64. Every tool is free, works offline once loaded, and never sends what you paste to a server — the formatting, parsing, decoding, and signature verification all happen locally, in your own browser.

Want the background on how these formats actually work? Read the guides: JSON Formatter Guide, Understanding JWTs, Base64 Encoding Explained.

Frequently asked questions

Is Objectparse really free?

Yes, every tool is free with no account, sign-up, or usage limit. The site is supported by ads shown alongside the tools, not by paywalling features.

Do you store or upload what I paste into a tool?

No. Every tool — JSON, JWT, and Base64 — runs its formatting, decoding, and validation logic entirely in your browser. The only optional local storage is a small 'recent activity' history, which you explicitly opt into and which never leaves your device.

Which developer tools are available right now?

A JSON formatter/validator, a JWT decoder/encoder with signature verification, and a Base64 encoder/decoder for text and files. More utilities are on the way.