Flatten a JSON Object

Flatten a JSON Object into a single-level key-value structure using dot notation. Quickly convert nested data into a flat, readable format.

Paste your input above or import a file below.
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Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total keys: 0

How to Use:

Paste your nested JSON into the input box on the left, or load a file using “Choose File.” As soon as you do, the tool flattens the structure and displays the result on the right. Each nested key becomes a dot-notated path like user.name.first. The result updates live and includes a key counter underneath. You can copy the output, export it as a file, or clear everything with one click.

What Flatten a JSON Object can do:

Flatten a JSON Object takes deeply nested data and simplifies it into a flat list of key-value pairs. It uses dot notation to show each path through the original structure, making it perfect for tables, CSV export, or form mapping. It supports nested objects and array values, but skips flattening arrays into paths to keep things clear. Everything runs locally and updates instantly.

Example:

Input:

{
  "user": {
    "name": {
      "first": "Alice",
      "last": "Smith"
    },
    "age": 30
  },
  "active": true
}

Output:

{
  "user.name.first": "Alice",
  "user.name.last": "Smith",
  "user.age": 30,
  "active": true
}

Common Use Cases:

Flatten a JSON Object is ideal for transforming data before exporting to spreadsheets, normalizing it for databases, prepping for CSV output, or mapping it into form fields. It’s also great for quick inspection of deeply nested APIs or configuration files where the structure can get overwhelming.

Useful Tools & Suggestions:

When you’re ready to break down layers, Find JSON Keys/Values helps reveal exactly what’s inside before flattening anything. And after everything’s been condensed, Convert JSON to CSV can be used to shift the data into a table that’s easier to work with.

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