tofo-boxtools

Flatten JSON

developer

Flatten nested JSON objects into a single-level object with dot-notation keys.

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JSON

Options

Character used to join nested keys

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What is Flatten JSON?

Flatten JSON is a free online developer utility. Flatten nested JSON objects into a single-level object with dot-notation keys. It runs entirely in your browser, making it fast and accessible without any setup or installation.

How to Use Flatten JSON

  1. 1

    Paste your JSON data into the input field. The tool accepts both formatted and minified JSON.

  2. 2

    Click the Run button to process your input.

  3. 3

    Copy the result from the output panel using the Copy button, or download it as a text file.

Common Use Cases

  • →Speeding up repetitive development tasks.
  • →Validating and transforming data during debugging.
  • →Generating test data for development and QA environments.

Frequently Asked Questions

Is Flatten JSON free to use?

Yes, Flatten JSON is completely free with no usage limits. No account, signup, or payment is required.

Is my data sent to a server?

No. Flatten JSON runs entirely in your browser. Your data never leaves your device and is never sent to any server.

Does this tool work on mobile devices?

Yes, Flatten JSON is fully responsive and works on smartphones and tablets. It runs in any modern browser including Chrome, Firefox, Safari, and Edge.

🖼️
Image Tool

Try Image Compressor

Reduce image size up to 80% — free, instant, no upload needed.

→
🖼️
Image Tool

Try Image Compressor

Reduce image size up to 80% — free, instant, no upload needed.

→