Leggi il file JSON utilizzando JavaScript
JSON sta per Notazione oggetto JavaScript . È un modo di organizzare i dati in un file di script utilizzando il testo, semplificando l'archiviazione e la condivisione dei dati.
Lettura JSON i file, siano essi archiviati localmente o su un server, sono fondamentali per le applicazioni web. In questo tutorial tratteremo tre metodi per leggere i file JSON in JavaScript, che possono essere davvero utili per gli sviluppatori web.
Tabella dei contenuti
- Come leggere il file JSON in JavaScript?
- Utilizzo dell'API fetch() per leggere il file JSON
- Utilizzo del modulo Richiedi per leggere il file JSON
- Importando il modulo per leggere il file JSON
- Conclusione
NOTA: JavaScript supporta JSON internamente, quindi non richiede moduli aggiuntivi per importare e visualizzare JSON. Dobbiamo solo importare il file JSON e possiamo facilmente utilizzarlo direttamente per eseguire manipolazioni su di esso.
Come leggere il file JSON in JavaScript?
Tre metodi per leggere i file JSON in JavaScript sono:
Nota: Il file JSON seguente verrà utilizzato per recuperare i dati.
campione.json
{ 'users':[ { 'site':'techcodeview.com', 'user': 'Shobhit' } ] } 1. Utilizzo dell'API fetch() per leggere il file JSON
Il metodo fetch() viene utilizzato per leggere i file JSON (file locali o caricati). Utilizza la stessa sintassi per entrambi i tipi di file.
Sintassi
fetch('JSONFilePath').then().then().catch(); Segui questi passaggi per leggere il file JSON utilizzando il metodo API fetch:
- Crea un file JSON e aggiungivi dati
- Apri il file JavaScript
- Nel metodo fetch passa il percorso del file JSON
- Utilizza il metodo .json() per analizzare i dati in formato JSON.
- Visualizza il contenuto nella console.
Esempio di lettura del file JSON in JavaScript:
Il codice seguente ti aiuterà a comprendere l'uso del metodo fetch() per leggere i file JSON.
HTML Leggi il titolo del file JSON> head> <body> <h1>techcodeview.comh1> <h3>Vai alla console per vedere i dati recuperati!! h3> <script>function fetchJSONData() { fetch('./sample.json') .then((res) => { if (!res.ok) { lancia nuovo errore (`Errore HTTP! Stato: ${res.status} `); } return res.json(); }) .then((dati) => console.log(dati)) .catch((errore) => console.error('Impossibile recuperare i dati:', errore)); } fetchJSONData(); script> corpo> html> </pre> </code> <p dir='ltr'> <b> <strong>Produzione: </strong> </b> </p> <p dir='ltr'> <img src='//techcodeview.com/img/javascript-questions/49/read-json-file-using-javascript.webp' alt='visualizzazione console dei dati JSON dopo il recupero dell'API'> </p> <h2 id='using-the-require-module-to-read-json-file'> <b> <strong>2. Utilizzo del modulo Richiedi per leggere il file JSON </strong> </b> </h2> <p dir='ltr'> <span>Richiedi modulo </span> <span>viene utilizzato per includere moduli nell'applicazione. Può essere utilizzato per includere un file in un'applicazione web. </span> </p> <h3> <span>Sintassi: </span> </h3> <pre>require(JSONFilePath); </pre> <p dir='ltr'> <span>Segui questi passaggi per leggere i file JSON utilizzando il modulo richiesto in JavaScript. </span> </p> <ul> <li value='1'> <span>Crea il file JSON come specificato nell'approccio precedente </span> </li> <li value='2'> <span>Crea uno script.js e utilizza il metodo richiesto del nodo per importare il file JSON </span> </li> <li value='3'> <span>Stampa i dati sulla console </span> </li> </ul> <p dir='ltr'> <b> <strong>NOTA: </strong> </b> <span>Invece di eseguire il programma sul browser, lo eseguiremo sulla console utilizzando Node. Assicurati di avere almeno la versione 17.0 di Node. </span> </p> <h3> <b> <strong>Esempio </strong> </b> </h3> <p dir='ltr'> <span>Il codice seguente può essere incollato direttamente in un file di script (il nodo deve essere installato) per eseguire e recuperare i dati JSON. </span> </p>Javascript <code> <pre>const sample = require('./sample.json'); console.log(sample); </pre> </code> <p dir='ltr'> <b> <strong>Produzione: </strong> </b> </p> <pre>{ users: [ { site: 'GeeksForGeeks', user: 'Shobhit' } ] } </pre> <h2 id='by-importing-the-module-to-read-json-file'> <b> <strong>3. Importando il modulo per leggere il file JSON </strong> </b> </h2> <p dir='ltr'> <span>IL </span> <span>dichiarazione di importazione </span> <span>può essere utilizzato per importare e archiviare elementi di file JSON in una variabile in JavaScript. </span> </p> <h3> <span>Sintassi: </span> </h3> <pre>import nameOfVariable from 'JSONFilePath' assert {type: 'json'}; </pre> <ul> <li value='1'> <span>Crea il file JSON come descritto negli esempi precedenti. </span> </li> <li value='2'> <span>Crea un file script.js e importa il file JSON </span> </li> </ul> <h3> <b> <strong>Esempio di lettura del file JSON in JavaScript: </strong> </b> </h3> <p dir='ltr'> <span>Il codice seguente legge il file JSON importandolo utilizzando l'istruzione import. </span> </p>HTML <code> <pre> <html lang='en'> <head> <meta charset='UTF-8'> <meta name='viewport' content= 'width=device-width, initial-scale=1.0'> <title>Leggi il titolo del file JSON> head> <body> <h1>techcodeview.comh1> <h3>Vai alla console per vedere i dati recuperati!! h3> <script type='module' src='./script.js'>script> corpo> html> </pre> </code>Javascript <code> <pre>// script.js import user from './sample.json' assert { type: 'json' }; console.log(user) </pre> </code> <p dir='ltr'> <b> <strong>Produzione: </strong> </b> </p> <p dir='ltr'> <img src='//techcodeview.com/img/javascript-questions/49/read-json-file-using-javascript.webp' alt='vista console dei dati JSON utilizzando il modulo di importazione'> </p> <h2 id='conclusion'> <span>Conclusione </span> </h2> <p dir='ltr'> <span>Leggere i file JSON in JavaScript è un compito molto importante per uno sviluppatore web poiché i file JSON vengono utilizzati per archiviare dati utente, dati di configurazione, dati statici e altre informazioni vitali. </span> </p> <p dir='ltr'> <span>Questa guida spiega tre metodi per leggere i file JSON in JavaScript con esempi. Comprendendo queste tecniche, gli sviluppatori possono affrontare con sicurezza le attività relative ai file JSON, garantendo processi di sviluppo più fluidi ed esperienze utente migliorate. </span> </p> <br> <br>
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