Skip to content
CalcForge

JSON Flatten

Collapse nested objects into dot-notation paths for spreadsheets and flat schemas.

Mode:
Loading...
Loading...

Flatten nested JSON

Analytics tools, ORMs, and flat-file formats expect row-shaped data—not deeply nested trees. CalcForge walks your JSON and emits single-level keys joined by dots (or custom separators) so you can inspect, export, or join fields without writing a one-off script.

Good fits

  • Previewing how webhook payloads map to database columns
  • Preparing nested API data for CSV or Excel export
  • Building dot-path lists for form bindings or feature flags
  • Exploring config depth before refactoring to flatter structures
Input:
{"user":{"name":"Ada","address":{"city":"Berlin"}}}

Output:
{"user.name":"Ada","user.address.city":"Berlin"}

Practical notes

  • Arrays typically become indexed paths like `items.0.id`—confirm shape before bulk import.
  • Reverse flattening is not automatic; keep the original nested copy for round-trips.
  • Pair with JSON to CSV when you need a spreadsheet-ready file.

Frequently asked questions

How are arrays handled?

Each array index becomes part of the key path. Large arrays produce many flat keys—consider filtering first.

Can I choose a separator other than a dot?

Use the tool options when available; otherwise replace dots in the output or adjust in a spreadsheet step.

Does flattening lose type information?

Leaf values keep their JSON types as strings in the flat map. Nested structure is encoded only in key names.

Related searches for this tool
  • flatten json
  • unflatten json
  • json dot notation
  • free flatten json online
  • flatten json no upload
  • flatten json online
  • flatten json for api response
  • flatten json for developers
  • json flatten unflatten tool
  • json flatten unflatten calculator
  • best flatten json online

More tools from CalcForge

  • JSON Formatter & Validator

    Format, validate, and beautify JSON instantly. Paste minified JSON from any API and get clean, readable output. Free, no signup.

  • Base64 Encoder / Decoder

    Encode text or files to Base64 and decode Base64 strings back to readable text. Instant, client-side, no data sent to any server.

  • JWT Decoder

    Decode JWT tokens and inspect header, payload, and signature. Paste any JWT and see the claims instantly. No data stored or transmitted.

  • UUID Generator

    Generate UUID v4 random identifiers instantly. Single or bulk generation, copy to clipboard in one click. RFC 4122 compliant.

  • Regex Tester

    Test and debug regular expressions with live match highlighting. Supports JavaScript regex syntax with flags. Instant feedback as you type.

  • Cron Expression Generator

    Build and validate cron expressions with a visual editor. See upcoming scheduled run times using standard five-field cron syntax.

  • Hash Generator — SHA-256 & SHA-512

    Generate SHA-1, SHA-256, and SHA-512 hashes from any text string. Instant, client-side, with zero data transmission.

  • Color Converter — HEX, RGB, HSL

    Convert color values between HEX, RGB, RGBA, and HSL formats instantly. Copy any format to clipboard for CSS use.