Les JSON-fil med JavaScript
JSON står for JavaScript-objektnotasjon . Det er en måte å organisere data i en skriptfil ved hjelp av tekst, noe som gjør det enkelt å lagre og dele data.
Lesning JSON filer, enten de er lagret lokalt eller på en server, er avgjørende for nettapplikasjoner. I denne opplæringen vil vi dekke tre metoder for å lese JSON-filer i JavaScript, noe som kan være veldig nyttig for webutviklere.
Innholdsfortegnelse
- Hvordan lese JSON-fil i JavaScript?
- Bruke fetch() API for å lese JSON-filen
- Bruke Require Module for å lese JSON-fil
- Ved å importere modulen for å lese JSON-filen
- Konklusjon
MERK: JavaScript støtter JSON internt, så det krever ikke tilleggsmoduler for å importere og vise JSON. Vi må bare importere JSON-filen og kan enkelt bruke den direkte til å utføre manipulasjoner på den.
Hvordan lese JSON-fil i JavaScript?
Tre metoder for å lese JSON-filer i JavaScript er:
Merk: JSON-filen nedenfor vil bli brukt til å hente dataene.
sample.json
{ 'users':[ { 'site':'techcodeview.com', 'user': 'Shobhit' } ] } 1. Bruke fetch() API for å lese JSON-fil
Fetch()-metoden brukes til å lese JSON-filer (lokale eller opplastede filer). Den bruker samme syntaks for begge filtyper.
Syntaks
fetch('JSONFilePath').then().then().catch(); Følg disse trinnene for å lese JSON-filen ved hjelp av hente-API-metoden:
- Opprett en JSON-fil og legg til data til den
- Åpne JavaScript-filen
- I hentingsmetoden sender du banen til JSON-filen
- Bruk .json()-metoden til å analysere dataene i JSON-format.
- Vis innholdet i konsollen.
Eksempel på lesing av JSON-fil i JavaScript:
Koden nedenfor vil hjelpe deg å forstå bruken av fetch()-metoden for å lese JSON-filer.
HTML Les JSON Filetitle> head> <body> <h1>techcodeview.comh1> <h3>Gå til konsollen for å se de hentede dataene!! h3> <script>function fetchJSONData() { fetch('./sample.json') .then((res) => { if (!res.ok) { throw new Error (`HTTP-feil! Status: ${res.status} `); } return res.json(); }) .then((data) => console.log(data)) .catch((error) => console.error('Kan ikke hente data:', feil)); } fetchJSONData(); script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <p dir='ltr'> <img src='//techcodeview.com/img/javascript-questions/49/read-json-file-using-javascript.webp' alt='konsollvisning av JSON-data etter henting av API'> </p> <h2 id='using-the-require-module-to-read-json-file'> <b> <strong>2. Bruke Require Module for å lese JSON-filen </strong> </b> </h2> <p dir='ltr'> <span>Krever modul </span> <span>brukes til å inkludere moduler i søknaden din. Den kan brukes til å inkludere en fil i en nettapplikasjon. </span> </p> <h3> <span>Syntaks: </span> </h3> <pre>require(JSONFilePath); </pre> <p dir='ltr'> <span>Følg disse trinnene for å lese JSON-filer ved å bruke den nødvendige modulen i JavaScript. </span> </p> <ul> <li value='1'> <span>Opprett JSON-filen som spesifisert i forrige tilnærming </span> </li> <li value='2'> <span>Opprett en script.js og bruk den nødvendige metoden for noden for å importere JSON-filen </span> </li> <li value='3'> <span>Skriv ut dataene på konsollen </span> </li> </ul> <p dir='ltr'> <b> <strong>MERK: </strong> </b> <span>I stedet for å kjøre programmet på nettleseren, kjører vi det på konsollen ved hjelp av Node. Sørg for at du har minst Node versjon 17.0. </span> </p> <h3> <b> <strong>Eksempel </strong> </b> </h3> <p dir='ltr'> <span>Koden nedenfor kan limes direkte inn i en skriptfil (noden må være installert) for å kjøre og hente JSON-dataene. </span> </p>Javascript <code> <pre>const sample = require('./sample.json'); console.log(sample); </pre> </code> <p dir='ltr'> <b> <strong>Produksjon: </strong> </b> </p> <pre>{ users: [ { site: 'GeeksForGeeks', user: 'Shobhit' } ] } </pre> <h2 id='by-importing-the-module-to-read-json-file'> <b> <strong>3. Ved å importere modulen for å lese JSON-filen </strong> </b> </h2> <p dir='ltr'> <span>De </span> <span>importerklæring </span> <span>kan brukes til å importere og lagre JSON-filelementer i en variabel i JavaScript. </span> </p> <h3> <span>Syntaks: </span> </h3> <pre>import nameOfVariable from 'JSONFilePath' assert {type: 'json'}; </pre> <ul> <li value='1'> <span>Lag JSON-filen som beskrevet i de forrige eksemplene. </span> </li> <li value='2'> <span>Opprett en script.js-fil og importer JSON-filen </span> </li> </ul> <h3> <b> <strong>Eksempel på lesing av JSON-fil i JavaScript: </strong> </b> </h3> <p dir='ltr'> <span>Koden nedenfor Leser JSON-filen ved å importere den ved å bruke importsetningen. </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>Les JSON Filetitle> head> <body> <h1>techcodeview.comh1> <h3>Gå til konsollen for å se de hentede dataene!! h3> <script type='module' src='./script.js'>script> body> 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>Produksjon: </strong> </b> </p> <p dir='ltr'> <img src='//techcodeview.com/img/javascript-questions/49/read-json-file-using-javascript.webp' alt='konsollvisning av JSON-data ved hjelp av importmodul'> </p> <h2 id='conclusion'> <span>Konklusjon </span> </h2> <p dir='ltr'> <span>Å lese JSON-filer i JavaScript er en svært viktig oppgave for en nettutvikler ettersom JSON-filer brukes til å lagre brukerdata, konfigurasjonsdata, statiske data og annen viktig informasjon. </span> </p> <p dir='ltr'> <span>Denne veiledningen forklarte tre metoder for å lese JSON-filer i JavaScript med eksempler. Ved å forstå disse teknikkene kan utviklere trygt takle JSON-filrelaterte oppgaver, og sikre jevnere utviklingsprosesser og forbedrede brukeropplevelser. </span> </p> <br> <br>
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