Data Converters

JSON Flattener

Flatten deeply nested JSON objects into a single-level object with dot-path keys. Convert `{a: {b: {c: 1}}}` to `{'a.b.c': 1}`, useful for database inserts, spreadsheet export, or log analysis.

Runs entirely in your browser No account needed Copy or download result
JSON (nested) JSON (flat)
Paste JSON (nested) below, or drop a file

Converted entirely in your browser; your data never leaves your device

Features

  • Flattens nested objects to dot-path keys
  • Handles arrays, indices become path segments (a.0.b)
  • Configurable separator (dot, underscore, slash)
  • Preserves primitive values (strings, numbers, booleans, null)
  • Download as .json file
  • Browser-only

How to use it

  1. Paste your nested JSON into the input panel.
  2. Select the path separator (dot is default).
  3. Flattened JSON appears instantly in the output.
  4. Copy or download the result.

Use cases

  • Preparing nested JSON for flat CSV export
  • Flattening API responses for spreadsheet analysis
  • Debugging deeply nested configuration objects
  • Indexing document fields in a search engine

Limitations

  • Very deeply nested JSON can produce very long key names.
  • Arrays of primitives produce keys like list.0, list.1 etc.
See also

Related tools

data Browser

JSON Unflattener

Convert flat dot-path JSON back to nested objects. Paste {"a.b.c":1} and get {a:{b:{c:1}}}, free, browser-only.

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data Browser

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Dev Browser

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Format and beautify JSON online. Paste minified or messy JSON and get clean, 2-space indented output with syntax validation, instant, in-browser, no upload.

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Convert CSV to JSON in your browser. Paste data or upload a file, toggle header detection, infer types, and download pretty-printed JSON. No server, no account.

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data Browser

XML to JSON

Convert XML to JSON online. Paste any XML document and get a clean JSON object with attributes, namespaces handled. All processed locally, nothing uploaded.

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data Browser

YAML to JSON

Convert YAML to JSON instantly in your browser. Supports multi-document YAML, anchors, aliases, and complex nested structures. No upload, no account needed.

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Questions & answers

Frequently asked

What happens to arrays?

Array indices become numeric path segments. E.g. items[0].name becomes items.0.name.