экспресс-пост и удаление ответов понятия не поняты

Question

Понятия не имею, но кажется, что, когда я пытаюсь получить атрибут элемента из файла JSON, он говорит, что он нулевой. Все еще есть проблемы аудита npm :(, что вы думаете об этом?

Вот отредактированный код, который я сделал до сих пор:

export const data = require('./file.json');
export let DATA = data as Type[]; 

let temp = DATA;

app.post('/api/tickets', (req, res) => {
    // load past data into json string
    const past_data = JSON.stringify(temp);
    // load new data into json string
    const new_element = JSON.stringify(req.params.formData)
    if (new_element !== "")
    {
        // concat both string to 1 json string, then write into fs
        fs.writeFile("./file.json",[past_data,new_element],(err) => {
            if (err) throw err;
        });
    }

    // send it back as response to request
    const new_data = JSON.parse([past_data,new_element].toString());
    res.send(new_data);
});

app.delete('/api/tickets/:id', (req,res) => {
    // fined requested ticket based on id in global temp
    const ticket = temp.find(t => t.id === (req.params.id));
    if (typeof ticket !== 'undefined') {
        const index = temp.indexOf(ticket);
        // remove it from global temp
        temp.splice(index, 1)
    }

    // create json string out of global temp
    const data_after_delete = JSON.stringify(temp);

    // write it straight into fs
    fs.writeFile("./file.json",data_after_delete,(err) => {
        if (err) throw err;
    });

    // send it back to requester
    const new_data = JSON.parse(data_after_delete);
    res.send(new_data);
});

Один объект из файла json перед тем, как я в него напишу:

[
  {
    "id": "81a885d6-8f68-5bc0-bbbc-1c7b32e4b4e4",
    "title": "Need a Little Help with Your Site? Hire a Corvid Web Developer",
    "content": "Here at Wix we strive to support you with this community forum, API references, articles, videos and code examples. But sometimes you might need a little extra help to get your site exactly the way you want it. \nHire a developer from the Wix Arena, an online marketplace with top Corvid web developers from around the world. Submit your project details here, and we’ll find the right professional for you.",
    "userEmail": "jug@nesetal.af",
    "creationTime": 1542111235544,
    "labels": ["Corvid", "Api"]
  },

Один объект из файла json после того, как я в него напишу:

["[\"[\\\"[\\\\\\\"[{\\\\\\\\\\\\\\\"id\\\\\\\\\\\\\\\":\\\\\\\\\\\\\\\"81a885d6-8f68-5bc0-bbbc-1c7b32e4b4e4\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"title\\\\\\\\\\\\\\\":\\\\\\\\\\\\\\\"Need a Little Help with Your Site? Hire a Corvid Web Developer\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"content\\\\\\\\\\\\\\\":\\\\\\\\\\\\\\\"Here at Wix we strive to support you with this community forum, API references, articles, videos and code examples. But sometimes you might need a little extra help to get your site exactly the way you want it. \\\\\\\\\\\\\\\\nHire a developer from the Wix Arena, an online marketplace with top Corvid web developers from around the world. Submit your project details here, and we’ll find the right professional for you.\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"userEmail\\\\\\\\\\\\\\\":\\\\\\\\\\\\\\\"jug@nesetal.af\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"creationTime\\\\\\\\\\\\\\\":1542111235544,\\\\\\\\\\\\\\\"labels\\\\\\\\\\\\\\\":[\\\\\\\\\\\\\\\"Corvid\\\\\\\\\\\\\\\",\\\\\\\\\\\\\\\"Api\\\\\\\\\\\\\\\"]},

Answer 1

Вы должны использовать JSON.stringify только при записи в файл и JSON.parse при чтении из файла (если вы не используете require, который выполняет синтаксический анализ неявно). Управляйте вашими данными как обычными объектами и массивами, а не как строками JSON - это только повредит структуру, как вы заметили.

export let DATA: Type[] = require('./file.json');
function save() {
    const jsonString = JSON.stringify(DATA);
//                     ^^^^^^^^^^^^^^^^^^^^^ only call it here
    fs.writeFile("./file.json", jsonString, (err) => {
        if (err) throw err;
    });
}

app.post('/api/tickets', (req, res) => {
    if (req.params.formData) {
        const new_element = req.params.formData; // might need a JSON.parse() if it's a a json string
        // add to global temp by array manipulation
        DATA.push(new_element);
        save();
    }
    // send it back as response to request
    res.send(DATA);
});

app.delete('/api/tickets/:id', (req,res) => {
    // find requested ticket based on id in global temp
    const ticket = DATA.findIndex(t => t.id === (req.params.id));
    if (ticket !== -1) {
        // remove it from global temp
        DATA.splice(index, 1);
        save();
    }
    // send it back to requester
    res.send(DATA);
});