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

Input Text Output JSON Browser-only No upload by default

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

  • Object keys and array indexes are joined with dot notation.
  • Very large files depend on browser memory and device performance.
  • Malformed or highly specialized data may need manual cleanup before or after conversion.
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

JSON to CSV

Convert JSON arrays to CSV instantly. Flatten nested objects, pick a delimiter, and download a spreadsheet-ready .csv file. All processed locally in your browser.

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Dev Browser

JSON Formatter

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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data Browser

CSV to JSON

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.

Does JSON Flattener upload my data?

Your file or text is processed in your browser and is not uploaded.

What does JSON Flattener output?

It outputs flat JSON. Object keys and array indexes are joined with dot notation.

Should I review the result before using it?

Yes. Data formats vary, so always review generated output before using it in production, database, or publishing workflows.