{"id":7765,"date":"2022-06-10T04:26:29","date_gmt":"2022-06-10T04:26:29","guid":{"rendered":"https:\/\/www.jose-aguilar.com\/blog\/?p=7765"},"modified":"2022-06-10T04:26:29","modified_gmt":"2022-06-10T04:26:29","slug":"como-leer-una-api-json-con-xmlhttprequest","status":"publish","type":"post","link":"https:\/\/www.jose-aguilar.com\/blog\/como-leer-una-api-json-con-xmlhttprequest\/","title":{"rendered":"Como leer una API JSON con XMLHttpRequest"},"content":{"rendered":"<p>Obtener informaci\u00f3n de una API para mostrarla en tus aplicaciones es una de las tareas que como programador no puedes dejar de aprender.<\/p>\n<p>En este art\u00edculo vas a ver como <strong>leer un API JSON usando JavaScript puro y\u00a0XMLHttpRequest.<\/strong><\/p>\n<p><strong>XMLHttpRequest\u00a0<\/strong>es un objeto nativo del navegador que permite hacer solicitudes HTTP desde <strong>JavaScript<\/strong>.<\/p>\n<p>A modo pruebas, usar\u00e9 la <a href=\"https:\/\/jsonplaceholder.typicode.com\/\" target=\"_blank\" rel=\"noopener\">API JSON Placeholder<\/a>, una API gratuita para hacer pruebas y prototipos.<\/p>\n<p>Como siempre, te ilustrar\u00e9 todo en base a un ejemplo en funcionamiento.<\/p>\n<p>En este ejemplo he decidido depositar en el cuerpo de mi p\u00e1gina un contenedor vac\u00edo que usar\u00e9 para incorporar los contenidos que retorne la llamada a la API.<\/p>\n<h2>Contenedor HTML<\/h2>\n<p>Dentro del &lt;body&gt; o cuerpo de la p\u00e1gina voy a agregar el contenedor de resultados vac\u00edo.<\/p>\n<div id=\"wpshdo_1\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_1\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_1\"><\/a><a id=\"wpshat_1\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_1\"  onClick=\"javascript:wpsh_toggleBlock(1)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_1\" onClick=\"javascript:wpsh_code(1)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_1\" onClick=\"javascript:wpsh_print(1)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_1\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"html4strict\" style=\"font-family:monospace;\"><span class=\"sc2\">&lt;<a href=\"http:\/\/december.com\/html\/4\/element\/div.html\"><span class=\"kw2\">div<\/span><\/a> <span class=\"kw3\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;response&quot;<\/span>&gt;&lt;<span class=\"sy0\">\/<\/span><a href=\"http:\/\/december.com\/html\/4\/element\/div.html\"><span class=\"kw2\">div<\/span><\/a>&gt;<\/span><\/pre><\/div><\/div>\n<h2>Llamada XMLHttpRequest<\/h2>\n<p>Luego, en archivo <strong>JavaScript<\/strong> independiente, agrego la llamada <strong>XMLHttpRequest<\/strong> de la siguiente manera:<\/p>\n<div id=\"wpshdo_2\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_2\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_2\"><\/a><a id=\"wpshat_2\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_2\"  onClick=\"javascript:wpsh_toggleBlock(2)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_2\" onClick=\"javascript:wpsh_code(2)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_2\" onClick=\"javascript:wpsh_print(2)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_2\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\"><span class=\"kw2\">const<\/span> request <span class=\"sy0\">=<\/span> <span class=\"kw2\">new<\/span> XMLHttpRequest<span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n<span class=\"kw2\">const<\/span> url <span class=\"sy0\">=<\/span> <span class=\"st0\">'https:\/\/jsonplaceholder.typicode.com\/posts'<\/span><span class=\"sy0\">;<\/span>\nrequest.<span class=\"kw3\">open<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">&quot;GET&quot;<\/span><span class=\"sy0\">,<\/span> url<span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\nrequest.<span class=\"me1\">send<\/span><span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n&nbsp;\nrequest.<span class=\"me1\">onreadystatechange<\/span> <span class=\"sy0\">=<\/span> <span class=\"br0\">&#40;<\/span>e<span class=\"br0\">&#41;<\/span> <span class=\"sy0\">=&gt;<\/span> <span class=\"br0\">&#123;<\/span>\n    <span class=\"kw1\">if<\/span> <span class=\"br0\">&#40;<\/span>request.<span class=\"me1\">readyState<\/span> <span class=\"sy0\">==<\/span> 4 <span class=\"sy0\">&amp;&amp;<\/span> request.<span class=\"kw3\">status<\/span> <span class=\"sy0\">==<\/span> 200<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n        <span class=\"kw2\">const<\/span> posts <span class=\"sy0\">=<\/span> JSON.<span class=\"me1\">parse<\/span><span class=\"br0\">&#40;<\/span>request.<span class=\"me1\">responseText<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n        let html <span class=\"sy0\">=<\/span> <span class=\"st0\">'&lt;div class=&quot;posts&quot;&gt;'<\/span><span class=\"sy0\">;<\/span>\n        posts.<span class=\"me1\">forEach<\/span><span class=\"br0\">&#40;<\/span><span class=\"kw2\">function<\/span><span class=\"br0\">&#40;<\/span>post<span class=\"sy0\">,<\/span> index<span class=\"br0\">&#41;<\/span> <span class=\"br0\">&#123;<\/span>\n            console.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>`$<span class=\"br0\">&#123;<\/span>index<span class=\"br0\">&#125;<\/span> <span class=\"sy0\">:<\/span> $<span class=\"br0\">&#123;<\/span>post.<span class=\"me1\">title<\/span><span class=\"br0\">&#125;<\/span>`<span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n            html <span class=\"sy0\">+=<\/span> `<span class=\"sy0\">&lt;<\/span>div <span class=\"kw2\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;post card&quot;<\/span><span class=\"sy0\">&gt;<\/span>\n                        <span class=\"sy0\">&lt;<\/span>div <span class=\"kw2\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;card-header&quot;<\/span><span class=\"sy0\">&gt;<\/span>$<span class=\"br0\">&#123;<\/span>post.<span class=\"me1\">title<\/span><span class=\"br0\">&#125;<\/span><span class=\"sy0\">&lt;\/<\/span>div<span class=\"sy0\">&gt;<\/span>\n                        <span class=\"sy0\">&lt;<\/span>div <span class=\"kw2\">class<\/span><span class=\"sy0\">=<\/span><span class=\"st0\">&quot;card-body&quot;<\/span><span class=\"sy0\">&gt;<\/span>$<span class=\"br0\">&#123;<\/span>post.<span class=\"me1\">body<\/span><span class=\"br0\">&#125;<\/span><span class=\"sy0\">&lt;\/<\/span>div<span class=\"sy0\">&gt;<\/span>\n                    <span class=\"sy0\">&lt;\/<\/span>div<span class=\"sy0\">&gt;<\/span>`<span class=\"sy0\">;<\/span>\n        <span class=\"br0\">&#125;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span>\n        html <span class=\"sy0\">+=<\/span> <span class=\"st0\">'&lt;\/div&gt;'<\/span><span class=\"sy0\">;<\/span>\n        document.<span class=\"me1\">querySelector<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">'.response'<\/span><span class=\"br0\">&#41;<\/span>.<span class=\"me1\">innerHTML<\/span> <span class=\"sy0\">=<\/span> html<span class=\"sy0\">;<\/span>\n    <span class=\"br0\">&#125;<\/span>\n<span class=\"br0\">&#125;<\/span><\/pre><\/div><\/div>\n<p>En este caso, en la constante <em>request<\/em> estoy creando una instancia del objeto nativo del navegador <strong>XMLHttpRequest.<\/strong><\/p>\n<p>Creo otra constante llamada <em>url<\/em> para guardar en ella la url que usar\u00e9 como fuente de datos en formato <strong>JSON<\/strong>.<\/p>\n<p>Mediante el m\u00e9todo GET, abro y env\u00edo una solicitud a la url indicada.<\/p>\n<p>A continuaci\u00f3n, uso el evento \u00abonreadystatechange\u00bb para ejecutar el c\u00f3digo de respuesta al cliente cuando la solicitud est\u00e9 lista.<\/p>\n<p>Cuando la solicitud ha finalizado y la respuesta es positiva, con responseText recupero la informaci\u00f3n para <strong>convertir el formato JSON en array<\/strong>.<\/p>\n<p>A la vez que creo una variable <em>html\u00a0<\/em>para guardar el c\u00f3digo <strong>HTML<\/strong> del resultado, recorro el array para capturar cada elemento de la API y sacar los atributos de su informaci\u00f3n individualmente para crear la estructura <strong>HTML<\/strong> que necesito con el objetivo de mostrarlo en el formato deseado.<\/p>\n<p>En el siguiente enlace puedes ver que atributos o valores tiene cada elemento en la API:<\/p>\n<p><a href=\"https:\/\/jsonplaceholder.typicode.com\/posts\" target=\"_blank\" rel=\"noopener\">https:\/\/jsonplaceholder.typicode.com\/posts<\/a><\/p>\n<p>Finalmente, el contenido de la variable <em>html<\/em> que he rellenado din\u00e1micamente la deposito en mi contenedor de respuesta que tengo vac\u00edo en el cuerpo de la p\u00e1gina.<\/p>\n<p style=\"text-align: center;\"><a class=\"btn btn-secondary\" href=\"https:\/\/www.jose-aguilar.com\/scripts\/javascript\/xmlhttprequest-json\/\" target=\"_blank\" rel=\"noopener noreferrer\"><i class=\"fa fa-eye\"><\/i> Ver demo<\/a> <a class=\"btn btn-primary\" href=\"https:\/\/www.jose-aguilar.com\/scripts\/javascript\/xmlhttprequest-json\/xmlhttprequest-json.zip\"><i class=\"fa fa-download\"><\/i> Descargar<\/a><\/p>\n<h2>Conclusiones<\/h2>\n<p>Bastante m\u00e1s f\u00e1cil de lo que pensabas, \u00bfverdad?<\/p>\n<p>En este punto, me gustar\u00eda hacerte saber que <strong>XMLHttpRequest<\/strong> es un objeto antiguo que est\u00e1 quedando obsoleto pero todav\u00eda se usa porque tiene algunas caracter\u00edsticas que los m\u00e9todos modernos para hacer este tipo de llamadas todav\u00eda no tienen.<\/p>\n<p>Algunas de las caracter\u00edsticas m\u00e1s especiales que solo tiene este objeto son el hecho de tener que soportar scripts existentes que usan todav\u00eda <strong>XMLHttpRequest,\u00a0<\/strong>el soporte a navegadores antiguos y el rastreo del progreso de la subida de archivos que es muy \u00fatil para el programador hoy en d\u00eda ya que simplifica mucho el c\u00f3digo de progreso.<\/p>\n<p>En una pr\u00f3xima entrada me gustar\u00eda hacerte saber todo sobre <strong>XMLHttpRequest<\/strong>. Estate al tanto y no te lo pierdas.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Descubre con leer una API JSON usando el objeto nativo del navegador XMLHttpRequest y JavaScript.<\/p>\n","protected":false},"author":1,"featured_media":7766,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[122],"class_list":["post-7765","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-json"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Como leer una API JSON con XMLHttpRequest - Jose Aguilar Blog<\/title>\n<meta name=\"description\" content=\"Descubre con leer una API JSON usando el objeto nativo del navegador XMLHttpRequest y JavaScript puro.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como leer una API JSON con XMLHttpRequest - 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