How to Integrate Lovable with RapidAPI

Navigate to rapidapi.com and use the search bar at the top to find the API you need — for example, type 'weather', 'translation', or 'company data'. Each API listing shows pricing tiers, latency benchmarks, and a Playground tab where you can send real test requests in your browser before committing to an integration. On the API detail page, click the 'Subscribe to Test' button and select a pricing plan — most APIs offer a free tier with a limited request quota. Once subscribed, click 'Code Snippets' in the right sidebar and select any language (e.g., Node.js / axios) to see the exact headers you need: the X-RapidAPI-Key, X-RapidAPI-Host, and the endpoint URL. Copy your X-RapidAPI-Key from the 'Header Parameters' section — it looks like a long alphanumeric string. You will also need the X-RapidAPI-Host value for the specific API you subscribed to, which is the API's subdomain on p.rapidapi.com. Run a test request in the Playground to confirm your subscription is active and you see a successful JSON response before moving to the next step.

In your Lovable project, click the '+' icon in the top bar next to the preview panel to open the side panels, then click the 'Cloud' tab. Scroll down to the 'Secrets' section and click 'Add Secret'. In the Name field, type RAPIDAPI_KEY (use this exact name — your Edge Function code will reference it with Deno.env.get('RAPIDAPI_KEY')). Paste your X-RapidAPI-Key value into the Value field. Click 'Save'. The secret is now encrypted and stored in Lovable's red zone — it is inaccessible to the browser, your frontend code, or any client-side logic. Never paste your RapidAPI key into the Lovable chat prompt or into any frontend file. Lovable's free-tier chat history is publicly visible, and hardcoded keys in code are detectable in commit history. If you are calling multiple different APIs from RapidAPI and need separate host values, you can also store the API-specific host as a secret (e.g., RAPIDAPI_WEATHER_HOST) or hardcode the host string directly in the Edge Function code since the host is not a secret — only the key is sensitive.

In the Lovable chat, describe the Edge Function you need. Lovable will generate the TypeScript Deno function file and deploy it automatically. Be specific about the API endpoint URL, the query parameters it accepts, and the response fields you want to use. The Edge Function pattern is consistent across all RapidAPI integrations: read the secret key with Deno.env.get(), construct the request headers with X-RapidAPI-Key and X-RapidAPI-Host, fetch the RapidAPI endpoint, and return the relevant fields from the JSON response. The function should also handle CORS headers so your Lovable frontend can call it. If the RapidAPI endpoint requires POST with a JSON body (e.g., translation APIs), your Edge Function should accept a JSON body from the frontend and forward it to RapidAPI. Always include error handling that returns an informative message if RapidAPI returns a non-200 status — RapidAPI returns 429 for rate limit exceeded and 403 if your subscription has expired.

1// supabase/functions/rapidapi-proxy/index.ts
2import { serve } from "https://deno.land/std@0.168.0/http/server.ts";
3
4const corsHeaders = {
5  "Access-Control-Allow-Origin": "*",
6  "Access-Control-Allow-Headers": "authorization, x-client-info, apikey, content-type",
7};
8
9serve(async (req) => {
10  if (req.method === "OPTIONS") {
11    return new Response("ok", { headers: corsHeaders });
12  }
13
14  try {
15    const url = new URL(req.url);
16    const city = url.searchParams.get("city");
17
18    if (!city) {
19      return new Response(
20        JSON.stringify({ error: "city parameter is required" }),
21        { status: 400, headers: { ...corsHeaders, "Content-Type": "application/json" } }
22      );
23    }
24
25    const rapidApiKey = Deno.env.get("RAPIDAPI_KEY");
26    if (!rapidApiKey) {
27      return new Response(
28        JSON.stringify({ error: "RAPIDAPI_KEY secret not configured" }),
29        { status: 500, headers: { ...corsHeaders, "Content-Type": "application/json" } }
30      );
31    }
32
33    const apiResponse = await fetch(
34      `https://open-weather13.p.rapidapi.com/city/${encodeURIComponent(city)}/EN`,
35      {
36        method: "GET",
37        headers: {
38          "X-RapidAPI-Key": rapidApiKey,
39          "X-RapidAPI-Host": "open-weather13.p.rapidapi.com",
40        },
41      }
42    );
43
44    if (!apiResponse.ok) {
45      const errorText = await apiResponse.text();
46      return new Response(
47        JSON.stringify({ error: `RapidAPI error ${apiResponse.status}: ${errorText}` }),
48        { status: apiResponse.status, headers: { ...corsHeaders, "Content-Type": "application/json" } }
49      );
50    }
51
52    const data = await apiResponse.json();
53
54    return new Response(
55      JSON.stringify({
56        city: data.name,
57        temperature: data.main?.temp,
58        feels_like: data.main?.feels_like,
59        description: data.weather?.[0]?.description,
60        humidity: data.main?.humidity,
61      }),
62      { headers: { ...corsHeaders, "Content-Type": "application/json" } }
63    );
64  } catch (error) {
65    return new Response(
66      JSON.stringify({ error: error.message }),
67      { status: 500, headers: { ...corsHeaders, "Content-Type": "application/json" } }
68    );
69  }
70});

Now that the Edge Function is deployed, wire up your React frontend to call it. In Lovable's chat, describe the UI interaction that should trigger the API call — for example, a search input that fires on button click, a form field with an onChange handler, or an automatic call on page load. Lovable will generate the React component with a fetch or supabase.functions.invoke call. The frontend calls your Edge Function URL rather than RapidAPI directly, so there are no API keys in the browser and no CORS issues. For calling Edge Functions, Lovable typically uses the Supabase client's functions.invoke method when Supabase Auth is active, or a plain fetch to the function URL for public endpoints. Make sure your component handles loading states (show a spinner while the request is in flight) and error states (display a friendly message if the API call fails or the city is not found). You should also implement a simple debounce on text inputs to avoid firing a request on every keystroke, which would quickly exhaust a free RapidAPI plan's monthly quota.

RapidAPI enforces rate limits at the subscription level — most free plans allow between 100 and 500 requests per month or per day. When you exceed the limit, the API returns a 429 status code with a JSON body like { 'message': 'You have exceeded the rate limit per month for your plan' }. Your Edge Function should forward meaningful error messages back to the frontend rather than swallowing them. In Lovable's Cloud tab, click 'Logs' to see real-time Edge Function execution logs — this is the fastest way to debug unexpected 429s, malformed requests, or wrong API host values. You can also monitor your RapidAPI usage on the 'My Apps' → 'Analytics' page of the RapidAPI developer dashboard, which shows request counts, error rates, and latency per API. If you are building a production app and expect meaningful traffic, consider upgrading your RapidAPI subscription tier or caching responses in your Supabase database to reduce API calls. For example, weather data for a given city could be cached for 30 minutes in a Supabase table and only refreshed when the cache is stale. For complex production configurations, RapidDev's team can help design caching layers and rate limit handling strategies for RapidAPI integrations.