Format and validate JSON, minify it, and encode or decode Base64 — free developer tools that run entirely in your browser.
Free tools — everything runs in your browser. Nothing is sent anywhere.
Developers, students and IT workers deal with JSON and Base64 every day — a config file that will not parse, an API response that needs formatting, or a token that needs decoding to see what is inside. This free JSON formatter and Base64 tool does both jobs in one place, in your browser. Paste messy JSON and get it neatly formatted and validated, with clear errors when a comma or bracket is missing. Minify it when you need the smallest version for an API call. Encode any text to Base64, or decode a Base64 string back to readable text, with one click and a copy button for the result. Nothing is uploaded, so API keys, tokens and private data stay on your device. There is no sign-up and nothing to install.
JSON is a text format for structured data, used by almost every website and app to send information. It uses curly brackets for objects, square brackets for lists, and key-value pairs like "name": "Ali".
Usually a missing comma, an extra comma after the last item, or a mismatched bracket or quote. The validator points out the problem so you can fix it.
Base64 turns binary data or special text into plain letters and numbers that can travel safely in emails, URLs and API tokens. It is not encryption — anyone can decode it.
Yes for decoding and formatting, because nothing is uploaded — the work happens in your browser. Still, avoid pasting live production secrets into any web page out of habit.