Is my data uploaded to a server?

No. JSON Flatten runs 100% in your browser tab, so whatever you paste never leaves your device — safe for tokens, configs, and private payloads.

Does it work offline?

Yes. Once the page has loaded it keeps working with no network, because all processing happens locally.

Is there a size limit?

No hard limit. It handles as much as your browser can hold in memory, and it all runs on-device.

All dev tools

JSON Flatten

JSON Flatten that runs entirely in your browser — nothing you paste is uploaded.

Input

OutputValid

{
  "a.b.c": 1
}

About this tool

JSON tools format, minify, validate, and reshape JSON — the everyday lingua franca of APIs and config. Pretty-print a minified blob, sort keys for a clean diff, or convert to CSV, XML, YAML, or a TypeScript interface, all without leaving the tab.

How to use it

Paste your input
Drop your text, code, or data into the input box. JSON Flatten runs on whatever you enter — no sign-up and no size limit beyond what your browser can hold.
Read the result instantly
The output updates as you type, computed on your device. A valid / invalid badge tells you at a glance whether the input parsed.
Copy it
Press Copy to put the result on your clipboard, ready to paste into your editor, terminal, or ticket.

Frequently asked

Is my data uploaded to a server?: No. JSON Flatten runs 100% in your browser tab, so whatever you paste never leaves your device — safe for tokens, configs, and private payloads.
Does it work offline?: Yes. Once the page has loaded it keeps working with no network, because all processing happens locally.
Is there a size limit?: No hard limit. It handles as much as your browser can hold in memory, and it all runs on-device.

SERBABISA · CAN DO ANYTHING