Does this tool upload my JSON?

No. Every parse, transform, and download runs entirely in your browser using JavaScript and Web Workers. The file never leaves your device — there is no upload endpoint and no server-side processing.

What if my input isn't an array?

You'll see an error. Wrap your single object in [...], or pick a different tool — JSON Path Evaluator can extract an array from a deeper path.

How are missing fields handled?

Each row contains every header column. Cells absent from a given object are emitted as empty strings.

JSON to CSV

Paste or drop a JSON array on the left, get CSV on the right. Flatten nested objects into dot-notated columns.

Flatten nested objects

JSON Input

CSV Output

JSON Input

CSV Output

How to use JSON to CSV

Paste a JSON array
Drop a .json file or paste a JSON array of objects on the left.
Toggle nested-object flattening
When enabled, {a: {b: 1}} becomes a column named a.b. When disabled, nested values are JSON.stringified into the cell.
Read the CSV output
The right pane shows live CSV. Headers are the union of all object keys.
Download the .csv
Click Download to save the result.

FAQ

Does this tool upload my JSON?: No. Every parse, transform, and download runs entirely in your browser using JavaScript and Web Workers. The file never leaves your device — there is no upload endpoint and no server-side processing.
What if my input isn't an array?: You'll see an error. Wrap your single object in [...], or pick a different tool — JSON Path Evaluator can extract an array from a deeper path.
How are missing fields handled?: Each row contains every header column. Cells absent from a given object are emitted as empty strings.

CSV to JSON

Convert CSV data to a JSON array of objects, with header row and indent options.

JSON Formatter

Format, minify, or validate JSON with configurable indentation and error reporting.

CSV Viewer

View and explore CSV files with sorting, filtering, and column type detection. Handles 100k+ rows.

Related tools