Convert JSON Flatten Online
Flatten nested JSON to dot-notation keys, or unflatten back. Use JSON Flatten in your browser with no signup, no daily limit, and no backend processing for tool input.
Problem
You need to move data through JSON Flatten without writing a script or uploading the source file to another service.
What to do
JSON Flatten is useful when a format mismatch blocks the next step. Convert the data, inspect the preview, then continue into validation, cleanup, or export.
- 1Paste or upload the source data into JSON Flatten.
- 2Confirm the format options and preview the result.
- 3Copy or download the converted output.
Example
Example source input
Source data with headers, fields, and nested values
Example converted output
Converted data ready to copy, download, or continue into another tool.
Use the browser tool
JSON Flatten Converter is a free, browser-based tool that helps you convert between formats. Flatten nested JSON to dot-notation keys, or unflatten back. 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.
People also ask
- How do I use JSON Flatten?
- Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Flatten nested JSON to dot-notation keys, or unflatten back.
- 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 Flatten Converter free?
- Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.