尝试从 MediaWiki API 获取一条数据时出现“类型错误：无法读取未定义的属性 '0'”

Question

I'm attempting to code something to get various attributes from the MediaWiki API. However, it throws an error when I attempt to get certain data from the page, for example, the title.

        const reqDesc = (requestid) => new Promise((resolve, reject) => {
            request({
                method: 'GET',
                url: `https://example.wikia.com/api/v1/Articles/AsSimpleJson?id=${requestid}`
            }, (error, response, body) => {
                if (!error && response.statusCode === 200) {
                    return resolve(`<${body.sections[0].content[0].text}>`);
                } else if (error) {
                    return reject(`Error: ${error}`);
                } else {
                    return reject(`Response code: ${response.statusCode}`);
                }
            });
        });

(I know request is deprecated, I'm attempting to find something better.)

The above code should work, however at return resolve(`<${body.items[0].id}>`); , it throws 'TypeError: Cannot read property '0' of undefined'

Answer 1

Instead of request , you could use Axios . As for 'TypeError: Cannot read property '0' of undefined' , it means either sections or content is undefined. You might want to take a look at what is inside body .

Example:

let requestid = 1;
let url = `https://example.wikia.com/api/v1/Articles/AsSimpleJson?id=${requestid}`;
axios({
  url: url,
  responseType: 'json',
})
.then(response => {
  console.log('--response--');
  let section = reponse.data.sections[0] || {};
  let content = section.content || {};
  let elem = content[0] || {};
  let text = content.text;
  return text;
})
.then(console.log)
.catch(error => {
  console.log('--error--');
  console.log(error);
});