JSON Key Renamer

What is JSON Key Renamer?

JSON Key Renamer Cleaner is a free, browser-based tool that helps you tidy up and standardize messy datasets. Rename keys with rules (snake_case, prefix strip, mapping table). It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

Used by

• Data analysts
• Operations teams
• Researchers
• QA engineers
• Data cleaning teams
• Analysts

Recommended workflow

1. 1

   Prepare the input

   Clean obvious quality problems before analysis, imports, dashboards, or automation.

2. 2

   Run JSON Key Renamer

   Review the preview, copy or download the result, and keep everything local in your browser.

3. 3

   Next recommended tool

   Rename Columns: Bulk-rename CSV/JSON columns.

   Open tool
4. 4

   Then continue with

   JSON Flatten: Flatten nested JSON to dot-notation keys, or unflatten back.

   Open tool
5. 5

   Then continue with

   JSON Formatter: Pretty-print, minify, and indent JSON safely.

   Open tool

Frequently asked questions

How do I use JSON Key Renamer?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Rename keys with rules (snake_case, prefix strip, mapping table).

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is JSON Key Renamer Cleaner free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.