diff --git a/src/coord/geo/GeoJSONResource.ts b/src/coord/geo/GeoJSONResource.ts
index 93a1d71233..d2c665c4ae 100644
--- a/src/coord/geo/GeoJSONResource.ts
+++ b/src/coord/geo/GeoJSONResource.ts
@@ -115,7 +115,7 @@ export class GeoJSONResource implements GeoResource {
             fixTextCoord(mapName, region);
             fixDiaoyuIsland(mapName, region);
 
-            // Some area like Alaska in USA map needs to be tansformed
+            // Some area like Alaska in USA map needs to be transformed
             // to look better
             const specialArea = this._specialAreas && this._specialAreas[regionName];
             if (specialArea) {
@@ -141,7 +141,7 @@ export class GeoJSONResource implements GeoResource {
         return {
             // For backward compatibility, use geoJson
             // PENDING: it has been returning them without clone.
-            // do we need to avoid outsite modification?
+            // do we need to avoid outside modification?
             geoJson: this._geoJSON,
             geoJSON: this._geoJSON,
             specialAreas: this._specialAreas
@@ -161,9 +161,5 @@ function calculateBoundingRect(regions: GeoJSONRegion[]): BoundingRect {
 }
 
 function parseInput(source: GeoJSONSourceInput): GeoJSON | GeoJSONCompressed {
-    return !isString(source)
-        ? source
-        : (typeof JSON !== 'undefined' && JSON.parse)
-        ? JSON.parse(source)
-        : (new Function('return (' + source + ');'))();
+    return !isString(source) ? source : JSON.parse(source);
 }