CSV ↔ GeoJSON (Schema Mapper)

Map CSV columns to geometry and properties, set data types, validate rows, and export as GeoJSON — or reverse to CSV. All in your browser.

No upload Schema mapping Standards‑based

Tip: Use Scan Columns to pre‑fill the schema from your CSV header. Choose geometry from Lon/Lat, WKT, or GeoJSON column.

Direction

Precision

decimals

Applied to GeoJSON output and lon/lat export.

Paste CSV (or choose file)

Choose .csv

Geometry source

Longitude column

Latitude column

CRS (EPSG)

Assumes WGS84 if blank.

Assemble geometry

Group field

Order field

Validate lon/lat ranges

Drop invalid rows

Require geometry (skip empties)

Property schema

	CSV column	Rename to	Type

Types: string, number, integer, boolean, date. Unticked rows are excluded.

Result

No data yet.

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Notes:

Lon/Lat validation checks −180…180 / −90…90 when enabled.
WKT parser supports Point/LineString/Polygon/Multi*.
Line/Polygon assembly uses group + order; polygons are auto‑closed.