WKT to GeoJSON — via API

One HTTP call, no GDAL install, no servers. Pay-as-you-go credits with a free tier of 25 conversions per month.

Try it in the browser · Full API reference · Credit packs

Convert WKT to GeoJSON in your language

cURL

curl -X POST https://lat-lng.com/api/v1/convert \
  -H "Authorization: Bearer $LATLNG_API_KEY" \
  -F "file=@input.wkt" \
  -F "from=wkt" \
  -F "to=geojson" \
  -F "validate=true"

Python

import requests

resp = requests.post(
    "https://lat-lng.com/api/v1/convert",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    files={"file": open("input.wkt", "rb")},
    data={"from": "wkt", "to": "geojson", "validate": "true"},
)
job = resp.json()
print(job["output_url"], job["integrity"]["grade"])

Node.js

import { LatLngClient } from "@lat-lng/sdk";

const client = new LatLngClient(process.env.LATLNG_API_KEY!);
const result = await client.convert("input.wkt", {
  from: "wkt",
  to: "geojson",
  validate: true,
});
console.log(result.outputUrl, result.integrity?.grade);

How credits work

1 credit per conversion for files up to 25 MB; +1 credit per additional started 25 MB; +1 credit with validate=true (integrity report included). The free tier includes 25 credits per month; credit packs start at €9 and never expire.

Rate & size limits

Free: 30 requests/min. Pro: 600 requests/min. Files up to 1 GB on every plan — larger files simply cost more credits.

Frequently asked questions

How do I convert WKT to GeoJSON programmatically?

POST your file to https://lat-lng.com/api/v1/convert with "to=geojson". You get back a signed download URL. Works from cURL, Python, Node, or any HTTP client — no GDAL or GIS libraries required.

What does it cost?

1 credit per conversion (files up to 25 MB; +1 credit per additional 25 MB). The free tier includes 25 credits per month; credit packs start at €9 for 500 and never expire.

Can I validate the output?

Yes — add "validate=true" (+1 credit) and the response includes an integrity report: coordinate-order checks, geometry validity, precision analysis, and a 0–100 score.

Is there an async mode for large files?

Yes — POST to /api/v1/convert/async (returns a job you can poll). The async endpoint writes GeoJSON, KML, GPX, and CSV; Shapefile is accepted as input, and Shapefile/WKT output are browser-only.