Download and format JSON endpoint data Download any JSON URLs directly to the dataset, and return them in CSV, XML, HTML, or Excel formats. Transform and filter the output. ## Features * Optimized, fast and lightweight * Small memory requirement * Works only with JSON payloads * Easy recursion * Filter and map complex JSON structures * Comes enabled with helper libraries: lodash, moment * Full access to your account resources through Apify variable * The run fails if all requests failed ## Handling errors This scraper is different from cheerio-scraper that you can handle the errors before the handlePageFunction fails. Using the handleError input, you can enqueue extra requests before failing, allowing you to recover or trying a different URL. js { handleError: async ({ addRequest, request, response, error }) => { request.noRetry = error.message.includes('Unexpected') || response.statusCode == 404; addRequest({ url: `${request.url}?retry=true`, }); } } ## Filter Map function This function can filter, map and enqueue requests at the same time. The difference is that the userData from the current request will pass to the next request. js const startUrls = [{ url: "https://example.com", userData: { firstValue: 0, } }]; // assuming the INPUT url above await Apify.call('pocesar/json-downloader', { filterMap: async ({ request, addRequest, data }) => { if (request.userData.isPost) { // userData will be inherited from previous request request.userData.firstValue == 0; // return the data only after the POST request return data; } else { // add the same request, but as a POST addRequest({ url: `${request.url}/?method=post`, method: 'POST', payload: { username: 'username', password: 'password', }, headers: { 'Content-Type': 'application/json', }, userData: { isPost: true } }); // omit return or return a falsy value will ignore the output } }, }) ## Examples ### Flatten an object js { filterMap: async ({ flattenObjectKeys, data }) => { return flattenObjectKeys(data); } } /** * an object like * { * "deep": { * "nested": ["state", "state1"] * } * } * * becomes * { * "deep.nested.0": "state", * "deep.nested.1": "state1" * } */ ### Submit a JSON API with POST jsonc { "startUrls": [ { "url": "https://ow0o5i3qo7-dsn.algolia.net/1/indexes/prod_PUBLIC_STORE/query?x-algolia-agent=Algolia%20for%20JavaScript%20(4.13.0)%3B%20Browser%20(lite)&x-algolia-api-key=0ecccd09f50396a4dbbe5dbfb17f4525&x-algolia-application-id=OW0O5I3QO7", "method": "POST", "payload": "{\"query\":\"instagram\",\"page\":0,\"hitsPerPage\":24,\"restrictSearchableAttributes\":[],\"attributesToHighlight\":[],\"attributesToRetrieve\":[\"title\",\"name\",\"username\",\"userFullName\",\"stats\",\"description\",\"pictureUrl\",\"userPictureUrl\",\"notice\",\"currentPricingInfo\"]}", "headers": { "content-type": "application/x-www-form-urlencoded" } } ] } ### Follow pagination from payload js { filterMap: async ({ addRequest, request, data }) => { if (data.nbPages > 1 && data.page < data.nbPages) { // get the current payload from the input const payload = JSON.parse(request.payload); // change the page number request.payload = { ...payload, page: data.page + 1 }; // add the request for parsing the next page addRequest(request); } return data; } } ### Omit output if condition is met js { filterMap: async ({ addRequest, request, data }) => { if (data.hits.length < 10) { return; } return data; } } ### Unwind array of results, each item from the array in a separate dataset item js { filterMap: async ({ addRequest, request, data }) => { return data.hits; // just return an array from here } }