How to Build a Kundli Generator App in React Native (Complete Tutorial)

Building a Kundli (Janam Kundali) generator requires accurate planetary calculations, proper Rashi chart visualization, and intuitive user interfaces. This comprehensive tutorial walks you through creating a production-ready Vedic astrology app using React Native and the RoxyAPI Vedic Astrology API.

By the end of this guide, you will have a fully functional Kundli generator app with birth details input, D1 chart display, planetary positions, house descriptions, and nakshatra information.

What We Will Build

Our Kundli generator app includes:

1. Birth Details Input - Name, date, time, and location with validation
2. D1 Rashi Chart - Complete birth chart with planetary placements
3. Planetary Positions - All 9 grahas with Rashi, nakshatra, and degree
4. House Information - 12 bhavas with detailed descriptions
5. Lagna Calculator - Accurate ascendant calculation
6. Chart Visualization - North Indian style Kundali chart
7. Profile Storage - Save and manage multiple Kundalis

Tech Stack

• Frontend: React Native with Expo
• State Management: React Context + AsyncStorage
• API: RoxyAPI Vedic Astrology endpoints
• Navigation: React Navigation v6
• UI Components: React Native Paper
• Charts: Custom SVG components

Prerequisites

• Node.js 18+ or Bun installed
• Expo CLI (npm install -g expo-cli)
• RoxyAPI account with Vedic Astrology API access (sign up here)
• Basic understanding of React Native

Project Setup

Initialize the Expo project and install dependencies:

npx create-expo-app kundli-generator
cd kundli-generator

# Install core dependencies
npm install @react-navigation/native @react-navigation/stack
npm install react-native-paper
npm install @react-native-async-storage/async-storage
npm install react-native-svg
npm install @react-native-community/datetimepicker

# Install Expo dependencies
npx expo install react-native-screens react-native-safe-area-context
npx expo install react-native-gesture-handler

Step 1: API Client Setup

Create a robust API client with TypeScript types:

// lib/types.ts
export interface BirthDetails {
  name: string;
  date: string; // YYYY-MM-DD
  time: string; // HH:MM:SS
  latitude: number;
  longitude: number;
  timezone: number;
  location: string;
}

export interface NakshatraData {
  anga: string;
  key: number;
  ratio: number;
  abhijit: boolean;
  left: number;
  name: string;
  pada: number;
}

export interface PlanetData {
  graha: string;
  nakshatra: NakshatraData;
  longitude: number;
  isRetrograde: boolean;
}

export interface RashiData {
  rashi: string;
  signs: PlanetData[];
}

export interface PlanetMeta {
  graha: string;
  rashi: string;
  longitude: number;
  nakshatra: NakshatraData;
  isRetrograde: boolean;
}

export interface HouseData {
  number: number;
  name: string;
  description: string;
}

export interface BirthChart {
  aries: RashiData;
  taurus: RashiData;
  gemini: RashiData;
  cancer: RashiData;
  leo: RashiData;
  virgo: RashiData;
  libra: RashiData;
  scorpio: RashiData;
  sagittarius: RashiData;
  capricorn: RashiData;
  aquarius: RashiData;
  pisces: RashiData;
  meta: {
    Sun: PlanetMeta;
    Moon: PlanetMeta;
    Mars: PlanetMeta;
    Mercury: PlanetMeta;
    Jupiter: PlanetMeta;
    Venus: PlanetMeta;
    Saturn: PlanetMeta;
    Rahu: PlanetMeta;
    Ketu: PlanetMeta;
    Lagna: PlanetMeta;
  };
  houses: HouseData[];
}

export interface KundliProfile {
  id: string;
  birthDetails: BirthDetails;
  chart: BirthChart;
  createdAt: Date;
}

API client implementation:

// lib/api.ts
const API_BASE = 'http://localhost:3001/api/v2/vedic-astrology';
const API_KEY = 'b91dd626-4d6a-4951-bf87-e1c7c90c45ba.bbdc9613db164edb.ggQtNcDzEx-YqTK6l2ssX4Y_GErDRONUps9vCOlcMrM';

export async function calculateBirthChart(
  details: BirthDetails
): Promise<BirthChart> {
  const response = await fetch(`${API_BASE}/birth-chart`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'X-API-Key': API_KEY,
    },
    body: JSON.stringify({
      date: details.date,
      time: details.time,
      latitude: details.latitude,
      longitude: details.longitude,
      timezone: details.timezone,
    }),
  });

  if (!response.ok) {
    const error = await response.text();
    throw new Error(`Birth chart API error: ${error}`);
  }

  return response.json();
}

// Helper: Convert time string to decimal hours
export function timeToDecimal(time: string): number {
  const [hours, minutes, seconds] = time.split(':').map(Number);
  return hours + minutes / 60 + (seconds || 0) / 3600;
}

// Helper: Format longitude to degrees/minutes
export function formatLongitude(longitude: number): string {
  const degrees = Math.floor(longitude);
  const minutes = Math.floor((longitude - degrees) * 60);
  const seconds = Math.floor(((longitude - degrees) * 60 - minutes) * 60);
  return `${degrees}° ${minutes}' ${seconds}"`;
}

Step 2: Context for State Management

Create global state to manage Kundli profiles:

// context/KundliContext.tsx
import React, { createContext, useContext, useState, useEffect } from 'react';
import AsyncStorage from '@react-native-async-storage/async-storage';
import { calculateBirthChart } from '../lib/api';
import type { BirthDetails, KundliProfile } from '../lib/types';

interface KundliContextValue {
  profiles: KundliProfile[];
  currentProfile: KundliProfile | null;
  loading: boolean;
  createProfile: (details: BirthDetails) => Promise<void>;
  selectProfile: (id: string) => void;
  deleteProfile: (id: string) => Promise<void>;
}

const KundliContext = createContext<KundliContextValue | null>(null);

export function KundliProvider({ children }: { children: React.ReactNode }) {
  const [profiles, setProfiles] = useState<KundliProfile[]>([]);
  const [currentProfile, setCurrentProfile] = useState<KundliProfile | null>(null);
  const [loading, setLoading] = useState(true);

  // Load profiles from storage on mount
  useEffect(() => {
    async function loadProfiles() {
      try {
        const stored = await AsyncStorage.getItem('@kundli_profiles');
        if (stored) {
          const parsed = JSON.parse(stored);
          setProfiles(parsed);
          if (parsed.length > 0) {
            setCurrentProfile(parsed[0]);
          }
        }
      } catch (error) {
        console.error('Failed to load profiles:', error);
      } finally {
        setLoading(false);
      }
    }
    loadProfiles();
  }, []);

  const createProfile = async (details: BirthDetails) => {
    setLoading(true);
    try {
      // Calculate birth chart from API
      const chart = await calculateBirthChart(details);

      const newProfile: KundliProfile = {
        id: Date.now().toString(),
        birthDetails: details,
        chart,
        createdAt: new Date(),
      };

      const updatedProfiles = [newProfile, ...profiles];
      setProfiles(updatedProfiles);
      setCurrentProfile(newProfile);

      // Save to storage
      await AsyncStorage.setItem(
        '@kundli_profiles',
        JSON.stringify(updatedProfiles)
      );
    } catch (error) {
      console.error('Failed to create profile:', error);
      throw error;
    } finally {
      setLoading(false);
    }
  };

  const selectProfile = (id: string) => {
    const profile = profiles.find((p) => p.id === id);
    if (profile) {
      setCurrentProfile(profile);
    }
  };

  const deleteProfile = async (id: string) => {
    const updatedProfiles = profiles.filter((p) => p.id !== id);
    setProfiles(updatedProfiles);

    if (currentProfile?.id === id) {
      setCurrentProfile(updatedProfiles[0] || null);
    }

    await AsyncStorage.setItem(
      '@kundli_profiles',
      JSON.stringify(updatedProfiles)
    );
  };

  return (
    <KundliContext.Provider
      value={{
        profiles,
        currentProfile,
        loading,
        createProfile,
        selectProfile,
        deleteProfile,
      }}
    >
      {children}
    </KundliContext.Provider>
  );
}

export function useKundli() {
  const context = useContext(KundliContext);
  if (!context) {
    throw new Error('useKundli must be used within KundliProvider');
  }
  return context;
}

Step 3: Birth Details Input Screen

Create a comprehensive input form:

// screens/BirthDetailsScreen.tsx
import React, { useState } from 'react';
import {
  View,
  Text,
  TextInput,
  TouchableOpacity,
  ScrollView,
  StyleSheet,
  ActivityIndicator,
  Platform,
} from 'react-native';
import DateTimePicker from '@react-native-community/datetimepicker';
import { useKundli } from '../context/KundliContext';

export function BirthDetailsScreen({ navigation }: any) {
  const { createProfile } = useKundli();
  const [name, setName] = useState('');
  const [date, setDate] = useState(new Date(1990, 6, 15));
  const [time, setTime] = useState(new Date(1990, 6, 15, 14, 30));
  const [location, setLocation] = useState('');
  const [latitude, setLatitude] = useState('28.6139');
  const [longitude, setLongitude] = useState('77.2090');
  const [timezone, setTimezone] = useState('5.5');
  const [showDatePicker, setShowDatePicker] = useState(false);
  const [showTimePicker, setShowTimePicker] = useState(false);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const formatDate = (date: Date): string => {
    const year = date.getFullYear();
    const month = String(date.getMonth() + 1).padStart(2, '0');
    const day = String(date.getDate()).padStart(2, '0');
    return `${year}-${month}-${day}`;
  };

  const formatTime = (date: Date): string => {
    const hours = String(date.getHours()).padStart(2, '0');
    const minutes = String(date.getMinutes()).padStart(2, '0');
    const seconds = String(date.getSeconds()).padStart(2, '0');
    return `${hours}:${minutes}:${seconds}`;
  };

  const validate = (): string | null => {
    if (name.trim().length < 2) {
      return 'Please enter a valid name';
    }
    if (!location.trim()) {
      return 'Please enter birth location';
    }

    const lat = parseFloat(latitude);
    const lon = parseFloat(longitude);
    const tz = parseFloat(timezone);

    if (isNaN(lat) || lat < -90 || lat > 90) {
      return 'Invalid latitude (-90 to 90)';
    }
    if (isNaN(lon) || lon < -180 || lon > 180) {
      return 'Invalid longitude (-180 to 180)';
    }
    if (isNaN(tz) || tz < -12 || tz > 14) {
      return 'Invalid timezone (-12 to 14)';
    }

    return null;
  };

  const handleSubmit = async () => {
    const validationError = validate();
    if (validationError) {
      setError(validationError);
      return;
    }

    setError(null);
    setLoading(true);

    try {
      await createProfile({
        name: name.trim(),
        date: formatDate(date),
        time: formatTime(time),
        latitude: parseFloat(latitude),
        longitude: parseFloat(longitude),
        timezone: parseFloat(timezone),
        location: location.trim(),
      });

      navigation.replace('Chart');
    } catch (err) {
      setError('Failed to generate Kundli. Please check your inputs and try again.');
      console.error(err);
    } finally {
      setLoading(false);
    }
  };

  return (
    <ScrollView style={styles.container}>
      <View style={styles.content}>
        <Text style={styles.title}>Generate Janam Kundali</Text>
        <Text style={styles.subtitle}>
          Enter accurate birth details for precise Vedic astrology calculations
        </Text>

        <View style={styles.form}>
          <View style={styles.field}>
            <Text style={styles.label}>Full Name</Text>
            <TextInput
              style={styles.input}
              placeholder="Priya Sharma"
              value={name}
              onChangeText={(text) => {
                setName(text);
                setError(null);
              }}
              autoCapitalize="words"
            />
          </View>

          <View style={styles.field}>
            <Text style={styles.label}>Birth Date</Text>
            <TouchableOpacity
              style={styles.dateButton}
              onPress={() => setShowDatePicker(true)}
            >
              <Text style={styles.dateText}>{formatDate(date)}</Text>
            </TouchableOpacity>
            {showDatePicker && (
              <DateTimePicker
                value={date}
                mode="date"
                onChange={(event, selectedDate) => {
                  setShowDatePicker(Platform.OS === 'ios');
                  if (selectedDate) setDate(selectedDate);
                }}
                maximumDate={new Date()}
              />
            )}
          </View>

          <View style={styles.field}>
            <Text style={styles.label}>Birth Time</Text>
            <TouchableOpacity
              style={styles.dateButton}
              onPress={() => setShowTimePicker(true)}
            >
              <Text style={styles.dateText}>{formatTime(time)}</Text>
            </TouchableOpacity>
            {showTimePicker && (
              <DateTimePicker
                value={time}
                mode="time"
                is24Hour={true}
                onChange={(event, selectedTime) => {
                  setShowTimePicker(Platform.OS === 'ios');
                  if (selectedTime) setTime(selectedTime);
                }}
              />
            )}
          </View>

          <View style={styles.field}>
            <Text style={styles.label}>Birth Location</Text>
            <TextInput
              style={styles.input}
              placeholder="New Delhi, India"
              value={location}
              onChangeText={(text) => {
                setLocation(text);
                setError(null);
              }}
            />
          </View>

          <View style={styles.row}>
            <View style={[styles.field, { flex: 1, marginRight: 8 }]}>
              <Text style={styles.label}>Latitude</Text>
              <TextInput
                style={styles.input}
                placeholder="28.6139"
                value={latitude}
                onChangeText={(text) => {
                  setLatitude(text);
                  setError(null);
                }}
                keyboardType="numeric"
              />
            </View>
            <View style={[styles.field, { flex: 1 }]}>
              <Text style={styles.label}>Longitude</Text>
              <TextInput
                style={styles.input}
                placeholder="77.2090"
                value={longitude}
                onChangeText={(text) => {
                  setLongitude(text);
                  setError(null);
                }}
                keyboardType="numeric"
              />
            </View>
          </View>

          <View style={styles.field}>
            <Text style={styles.label}>Timezone (UTC offset)</Text>
            <TextInput
              style={styles.input}
              placeholder="5.5 (for IST)"
              value={timezone}
              onChangeText={(text) => {
                setTimezone(text);
                setError(null);
              }}
              keyboardType="numeric"
            />
            <Text style={styles.hint}>
              India: 5.5, USA EST: -5, UK: 0
            </Text>
          </View>

          {error && <Text style={styles.error}>{error}</Text>}

          <TouchableOpacity
            style={[styles.button, loading && styles.buttonDisabled]}
            onPress={handleSubmit}
            disabled={loading}
          >
            {loading ? (
              <ActivityIndicator color="#FFFFFF" />
            ) : (
              <Text style={styles.buttonText}>Generate Kundli</Text>
            )}
          </TouchableOpacity>
        </View>

        <Text style={styles.privacy}>
          Your data is stored locally on your device
        </Text>
      </View>
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#FFF8F0',
  },
  content: {
    padding: 20,
    paddingTop: 60,
  },
  title: {
    fontSize: 28,
    fontWeight: 'bold',
    color: '#8B4513',
    marginBottom: 8,
    textAlign: 'center',
  },
  subtitle: {
    fontSize: 14,
    color: '#A0522D',
    textAlign: 'center',
    marginBottom: 32,
    lineHeight: 20,
  },
  form: {
    backgroundColor: '#FFFFFF',
    borderRadius: 20,
    padding: 24,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 4 },
    shadowOpacity: 0.1,
    shadowRadius: 12,
    elevation: 6,
  },
  field: {
    marginBottom: 20,
  },
  label: {
    fontSize: 14,
    fontWeight: '600',
    color: '#8B4513',
    marginBottom: 8,
  },
  input: {
    borderWidth: 2,
    borderColor: '#F4A460',
    borderRadius: 12,
    padding: 14,
    fontSize: 16,
    color: '#4A4A4A',
    backgroundColor: '#FFF8F0',
  },
  hint: {
    fontSize: 12,
    color: '#A0522D',
    marginTop: 4,
  },
  dateButton: {
    borderWidth: 2,
    borderColor: '#F4A460',
    borderRadius: 12,
    padding: 14,
    backgroundColor: '#FFF8F0',
  },
  dateText: {
    fontSize: 16,
    color: '#4A4A4A',
  },
  row: {
    flexDirection: 'row',
  },
  error: {
    color: '#D2691E',
    fontSize: 14,
    marginBottom: 12,
    textAlign: 'center',
  },
  button: {
    backgroundColor: '#CD853F',
    borderRadius: 12,
    padding: 16,
    alignItems: 'center',
    marginTop: 8,
  },
  buttonDisabled: {
    backgroundColor: '#D2B48C',
  },
  buttonText: {
    color: '#FFFFFF',
    fontSize: 16,
    fontWeight: '600',
  },
  privacy: {
    fontSize: 12,
    color: '#A0522D',
    textAlign: 'center',
    marginTop: 24,
  },
});

Step 4: Chart Display Screen

Display the birth chart with planetary positions:

// screens/ChartScreen.tsx
import React from 'react';
import { ScrollView, View, Text, StyleSheet } from 'react-native';
import { useKundli } from '../context/KundliContext';
import { formatLongitude } from '../lib/api';

export function ChartScreen() {
  const { currentProfile } = useKundli();

  if (!currentProfile) {
    return (
      <View style={styles.emptyContainer}>
        <Text>No Kundli generated yet</Text>
      </View>
    );
  }

  const { birthDetails, chart } = currentProfile;
  const planets = Object.values(chart.meta);

  return (
    <ScrollView style={styles.container}>
      <View style={styles.header}>
        <Text style={styles.name}>{birthDetails.name}</Text>
        <Text style={styles.birthInfo}>
          Born: {birthDetails.date} at {birthDetails.time}
        </Text>
        <Text style={styles.location}>{birthDetails.location}</Text>
      </View>

      {/* Lagna Information */}
      <View style={styles.section}>
        <Text style={styles.sectionTitle}>🌅 Lagna (Ascendant)</Text>
        <View style={styles.lagnaCard}>
          <Text style={styles.lagnaRashi}>{chart.meta.Lagna.rashi}</Text>
          <Text style={styles.lagnaNakshatra}>
            {chart.meta.Lagna.nakshatra.name} Nakshatra (Pada {chart.meta.Lagna.nakshatra.pada})
          </Text>
          <Text style={styles.lagnaLongitude}>
            {formatLongitude(chart.meta.Lagna.longitude)}
          </Text>
        </View>
      </View>

      {/* Planetary Positions */}
      <View style={styles.section}>
        <Text style={styles.sectionTitle}>🪐 Planetary Positions</Text>
        {planets
          .filter((p) => p.graha !== 'Lagna')
          .map((planet) => (
            <View key={planet.graha} style={styles.planetCard}>
              <View style={styles.planetHeader}>
                <Text style={styles.planetName}>
                  {planet.graha} {planet.isRetrograde && '(R)'}
                </Text>
                <Text style={styles.planetRashi}>{planet.rashi}</Text>
              </View>
              <View style={styles.planetDetails}>
                <Text style={styles.planetNakshatra}>
                  {planet.nakshatra.name} (Pada {planet.nakshatra.pada})
                </Text>
                <Text style={styles.planetLongitude}>
                  {formatLongitude(planet.longitude)}
                </Text>
              </View>
            </View>
          ))}
      </View>

      {/* Houses Information */}
      <View style={styles.section}>
        <Text style={styles.sectionTitle}>🏛️ Twelve Houses (Bhavas)</Text>
        {chart.houses.map((house) => (
          <View key={house.number} style={styles.houseCard}>
            <Text style={styles.houseTitle}>
              {house.number}. {house.name}
            </Text>
            <Text style={styles.houseDescription}>{house.description}</Text>
          </View>
        ))}
      </View>
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#FFF8F0',
  },
  emptyContainer: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  header: {
    padding: 24,
    paddingTop: 60,
    backgroundColor: '#CD853F',
    alignItems: 'center',
  },
  name: {
    fontSize: 24,
    fontWeight: 'bold',
    color: '#FFFFFF',
    marginBottom: 8,
  },
  birthInfo: {
    fontSize: 14,
    color: '#FFF8F0',
    marginBottom: 4,
  },
  location: {
    fontSize: 14,
    color: '#FFF8F0',
  },
  section: {
    padding: 16,
  },
  sectionTitle: {
    fontSize: 20,
    fontWeight: 'bold',
    color: '#8B4513',
    marginBottom: 16,
  },
  lagnaCard: {
    backgroundColor: '#FFFFFF',
    borderRadius: 16,
    padding: 20,
    alignItems: 'center',
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.1,
    shadowRadius: 8,
    elevation: 4,
  },
  lagnaRashi: {
    fontSize: 28,
    fontWeight: 'bold',
    color: '#CD853F',
    marginBottom: 8,
  },
  lagnaNakshatra: {
    fontSize: 16,
    color: '#8B4513',
    marginBottom: 4,
  },
  lagnaLongitude: {
    fontSize: 14,
    color: '#A0522D',
    fontFamily: 'monospace',
  },
  planetCard: {
    backgroundColor: '#FFFFFF',
    borderRadius: 12,
    padding: 16,
    marginBottom: 12,
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.1,
    shadowRadius: 6,
    elevation: 3,
  },
  planetHeader: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: 8,
  },
  planetName: {
    fontSize: 18,
    fontWeight: 'bold',
    color: '#8B4513',
  },
  planetRashi: {
    fontSize: 16,
    fontWeight: '600',
    color: '#CD853F',
  },
  planetDetails: {
    flexDirection: 'row',
    justifyContent: 'space-between',
  },
  planetNakshatra: {
    fontSize: 14,
    color: '#A0522D',
  },
  planetLongitude: {
    fontSize: 13,
    color: '#A0522D',
    fontFamily: 'monospace',
  },
  houseCard: {
    backgroundColor: '#FFFFFF',
    borderRadius: 12,
    padding: 16,
    marginBottom: 12,
  },
  houseTitle: {
    fontSize: 16,
    fontWeight: 'bold',
    color: '#8B4513',
    marginBottom: 8,
  },
  houseDescription: {
    fontSize: 13,
    color: '#4A4A4A',
    lineHeight: 20,
  },
});

Step 5: Navigation Setup

Wire up all screens with navigation:

// App.tsx
import React from 'react';
import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
import { KundliProvider } from './context/KundliContext';
import { BirthDetailsScreen } from './screens/BirthDetailsScreen';
import { ChartScreen } from './screens/ChartScreen';

const Stack = createStackNavigator();

export default function App() {
  return (
    <KundliProvider>
      <NavigationContainer>
        <Stack.Navigator
          initialRouteName="BirthDetails"
          screenOptions={{
            headerStyle: {
              backgroundColor: '#CD853F',
            },
            headerTintColor: '#FFFFFF',
            headerTitleStyle: {
              fontWeight: 'bold',
            },
          }}
        >
          <Stack.Screen
            name="BirthDetails"
            component={BirthDetailsScreen}
            options={{ title: 'New Kundli' }}
          />
          <Stack.Screen
            name="Chart"
            component={ChartScreen}
            options={{ title: 'Janam Kundali' }}
          />
        </Stack.Navigator>
      </NavigationContainer>
    </KundliProvider>
  );
}

API Response Structure

When you call the birth chart endpoint, you receive comprehensive planetary data:

{
  "aries": {
    "rashi": "aries",
    "signs": [
      {
        "graha": "Mars",
        "nakshatra": {
          "name": "Ashwini",
          "pada": 3
        },
        "longitude": 8.147792932600055,
        "isRetrograde": false
      }
    ]
  },
  "meta": {
    "Sun": {
      "graha": "Sun",
      "rashi": "Gemini",
      "longitude": 88.92150950532948,
      "nakshatra": {
        "name": "Punarvasu",
        "pada": 3
      },
      "isRetrograde": false
    },
    "Lagna": {
      "graha": "Lagna",
      "rashi": "Aquarius",
      "longitude": 301.4560699202441,
      "nakshatra": {
        "name": "Dhanishta",
        "pada": 3
      }
    }
  },
  "houses": [
    {
      "number": 1,
      "name": "Lagna",
      "description": "The lagna, or ascendant, is the single most important indicator..."
    }
  ]
}

Advanced Features to Add

1. North Indian Chart Visualization

Create SVG-based Kundali chart:

// components/NorthIndianChart.tsx
import React from 'react';
import { View } from 'react-native';
import Svg, { Polygon, Text as SvgText, Line } from 'react-native-svg';

export function NorthIndianChart({ chart }: { chart: BirthChart }) {
  // SVG chart implementation with diamond layout
  // Position planets in respective houses
  // Show Lagna marking
  // Display retrograde indicators
}

2. Dasha Timeline

Show current Mahadasha, Antardasha, Pratyantardasha:

// components/DashaTimeline.tsx
export function DashaTimeline({ birthDetails }: { birthDetails: BirthDetails }) {
  // Fetch current dasha from /dasha-current endpoint
  // Display timeline with remaining periods
  // Show interpretations for each period
}

3. Multiple Profile Management

Allow users to save and switch between Kundalis:

// screens/ProfilesScreen.tsx
export function ProfilesScreen() {
  const { profiles, selectProfile, deleteProfile } = useKundli();
  // List all saved Kundalis
  // Swipe to delete functionality
  // Quick profile switcher
}

Production Checklist

• Add location autocomplete with geocoding
• Implement PDF export with complete chart
• Add share functionality
• Create chart screenshot feature
• Implement offline mode
• Add push notifications for dasha transitions
• Integrate remedies suggestions
• Add doshas detection (Manglik, Kalsarpa)
• Support multiple chart styles (North/South/East Indian)
• Add divisional charts (D9, D10, D60)

Conclusion

You now have a fully functional Kundli generator app with accurate Vedic astrology calculations. This foundation can be extended with advanced features like yoga detection, compatibility matching, transit analysis, and personalized predictions.

The RoxyAPI Vedic Astrology API handles all complex calculations, allowing you to focus on creating delightful user experiences for your astrology app users.

Ready to build your Kundli app? Sign up for RoxyAPI and get started today. Complete API documentation at roxyapi.com/docs.