CODE EXAMPLE FOR TYPESCRIPT

postgresql geojson points distance and typeorm

import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { TestLocation } from 'src/model/testlocation.entity';
import { getManager, QueryBuilder, Repository } from 'typeorm';
import { Geometry, Point } from 'geojson';
@Injectable()
export class LocationService {
  constructor(
    @InjectRepository(TestLocation) private readonly repo: Repository<TestLocation>,
  ) {}

  public async getAll() {
    return await this.repo.find();
  }
  
  public async create(location:TestLocation){
    const pointObject :Point= {
      type: "Point",
      coordinates: [location.long,location.lat]
  };
  location.location = pointObject;
  return await this.repo.save(location)
  }

  public async getRange(lat:number,long:number,range:number = 1000) {
    let origin = {
      type: "Point",
      coordinates: [long, lat]
    };
   let  locations = await this.repo
        .createQueryBuilder('t_test_location')
        .select(['t_test_location.city AS city','ST_Distance(location, ST_SetSRID(ST_GeomFromGeoJSON(:origin), ST_SRID(location)))/1000 AS distance' ])
        .where("ST_DWithin(location, ST_SetSRID(ST_GeomFromGeoJSON(:origin), ST_SRID(location)) ,:range)")
        .orderBy("distance","ASC")
        .setParameters({
           // stringify GeoJSON
          origin: JSON.stringify(origin),
          range:range*1000 //KM conversion
        })
       .getRawMany();
    return locations;
  }
}