Læs JSON-fil ved hjælp af JavaScript
JSON står for JavaScript-objektnotation . Det er en måde at organisere data i en scriptfil ved hjælp af tekst, hvilket gør det nemt at gemme og dele data.
Læsning JSON filer, uanset om de er gemt lokalt eller på en server, er afgørende for webapplikationer. I denne tutorial dækker vi tre metoder til at læse JSON-filer i JavaScript, hvilket kan være virkelig nyttigt for webudviklere.
Indholdsfortegnelse
- Hvordan læser jeg JSON-fil i JavaScript?
- Brug af fetch() API til at læse JSON-fil
- Brug af Require Module til at læse JSON-fil
- Ved at importere modulet til at læse JSON-filen
- Konklusion
BEMÆRK: JavaScript understøtter JSON internt, så det kræver ikke yderligere moduler for at importere og vise JSON. Vi skal bare importere JSON-filen og kan nemt bruge den direkte til at udføre manipulationer på den.
Hvordan læser jeg JSON-fil i JavaScript?
Tre metoder til at læse JSON-filer i JavaScript er:
Bemærk: Nedenstående JSON-fil vil blive brugt til at hente dataene.
sample.json
{ 'users':[ { 'site':'techcodeview.com', 'user': 'Shobhit' } ] } 1. Brug af fetch() API til at læse JSON-fil
metoden fetch() bruges til at læse JSON-filer (lokale eller uploadede filer). Den bruger den samme syntaks for begge filtyper.
Syntaks
fetch('JSONFilePath').then().then().catch(); Følg disse trin for at læse JSON-filen ved hjælp af appetch API-metoden:
- Opret en JSON-fil og tilføj data til den
- Åbn JavaScript-filen
- I hentemetoden videregives stien til JSON-filen
- Brug .json()-metoden til at parse dataene i JSON-format.
- Vis indholdet i konsollen.
Eksempel på læsning af JSON-fil i JavaScript:
Nedenstående kode hjælper dig med at forstå brugen af fetch()-metoden til at læse JSON-filer.
HTML Læs JSON Filetitle> head> <body> <h1>techcodeview.comh1> <h3>Gå til konsollen for at se de hentede data!! h3> <script>function fetchJSONData() { fetch('./sample.json') .then((res) => { if (!res.ok) { throw new Error (`HTTP-fejl! Status: ${res.status} `); } return res.json(); }) .then((data) => console.log(data)) .catch((error) => console.error('Kan ikke hente data:', fejl)); } fetchJSONData(); script> body> html> </pre> </code> <p dir='ltr'> <b> <strong>Produktion: </strong> </b> </p> <p dir='ltr'> <img src='//techcodeview.com/img/javascript-questions/49/read-json-file-using-javascript.webp' alt='konsolvisning af JSON-data efter hentning af API'> </p> <h2 id='using-the-require-module-to-read-json-file'> <b> <strong>2. Brug af Require Module til at læse JSON-fil </strong> </b> </h2> <p dir='ltr'> <span>Kræver modul </span> <span>bruges til at inkludere moduler i din ansøgning. Det kan bruges til at inkludere en fil i en webapplikation. </span> </p> <h3> <span>Syntaks: </span> </h3> <pre>require(JSONFilePath); </pre> <p dir='ltr'> <span>Følg disse trin for at læse JSON-filer ved hjælp af det påkrævede modul i JavaScript. </span> </p> <ul> <li value='1'> <span>Opret JSON-filen som angivet i den forrige fremgangsmåde </span> </li> <li value='2'> <span>Opret en script.js og brug den nødvendige metode for noden til at importere JSON-filen </span> </li> <li value='3'> <span>Udskriv dataene på konsollen </span> </li> </ul> <p dir='ltr'> <b> <strong>BEMÆRK: </strong> </b> <span>I stedet for at køre programmet på browseren, kører vi det på konsollen ved hjælp af Node. Sørg for, at du mindst har Node version 17.0. </span> </p> <h3> <b> <strong>Eksempel </strong> </b> </h3> <p dir='ltr'> <span>Nedenstående kode kan indsættes direkte i en scriptfil (node skal være installeret) for at udføre og hente JSON-dataene. </span> </p>Javascript <code> <pre>const sample = require('./sample.json'); console.log(sample); </pre> </code> <p dir='ltr'> <b> <strong>Produktion: </strong> </b> </p> <pre>{ users: [ { site: 'GeeksForGeeks', user: 'Shobhit' } ] } </pre> <h2 id='by-importing-the-module-to-read-json-file'> <b> <strong>3. Ved at importere modulet til at læse JSON-filen </strong> </b> </h2> <p dir='ltr'> <span>Det </span> <span>importerklæring </span> <span>kan bruges til at importere og gemme 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>Opret JSON-filen som beskrevet i de foregående eksempler. </span> </li> <li value='2'> <span>Opret en script.js-fil, og importer JSON-filen </span> </li> </ul> <h3> <b> <strong>Eksempel på læsning af JSON-fil i JavaScript: </strong> </b> </h3> <p dir='ltr'> <span>Nedenstående kode Læser JSON-filen ved at importere den ved hjælp af import-sætningen. </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>Læs JSON Filetitle> head> <body> <h1>techcodeview.comh1> <h3>Gå til konsollen for at se de hentede data!! 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>Produktion: </strong> </b> </p> <p dir='ltr'> <img src='//techcodeview.com/img/javascript-questions/49/read-json-file-using-javascript.webp' alt='konsolvisning af JSON-data ved hjælp af importmodul'> </p> <h2 id='conclusion'> <span>Konklusion </span> </h2> <p dir='ltr'> <span>At læse JSON-filer i JavaScript er en meget vigtig opgave for en webudvikler, da JSON-filer bruges til at gemme brugerdata, konfigurationsdata, statiske data og anden vital information. </span> </p> <p dir='ltr'> <span>Denne vejledning forklarede tre metoder til at læse JSON-filer i JavaScript med eksempler. Ved at forstå disse teknikker kan udviklere trygt tackle JSON-filrelaterede opgaver, hvilket sikrer jævnere udviklingsprocesser og forbedrede brugeroplevelser. </span> </p> <br> <br>
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