DUL Data Utility Labs

JSON and CSV - Private browser tool

JSON Flattener

Flatten nested JSON into dot notation for CSV exports, BI imports, logs, and API debugging.

Use the tool Read FAQ 
{
  "user": {
    "id": 42,
    "name": "Ada Lovelace",
    "roles": ["analyst", "admin"]
  },
  "account": {
    "plan": "pro",
    "limits": { "exports": 1000 }
  }
}

JSON Flattener

Private, browser-based, free to use.

What this tool helps you do

Flatten nested JSON into dot notation for CSV exports, BI imports, logs, and API debugging. Paste your data, run the tool, copy the result, and move on. The core workflow stays on one focused page.

Best use cases

  • Convert or clean data before importing it into spreadsheets, BI tools, databases, or internal apps.
  • Debug API payloads, logs, tokens, encodings, regular expressions, and text transformations.
  • Create lightweight examples for documentation, tests, tutorials, customer support, and team handoffs.

Related tools

JSON to CSV ConverterJSON FormatterJSON Schema GeneratorCSV to JSON ConverterJSON to CSV ConverterCSV to JSON ConverterJSON FormatterJSON Schema Generator

JSON Flattener FAQ

What does flattening JSON mean?

Nested keys are converted into single-level dot notation paths.

Can arrays be flattened?

Arrays are flattened with numeric indexes so they remain inspectable.

Why use a JSON flattener before CSV?

Flat keys map cleanly to CSV columns and spreadsheet headers.