尽管函数正确执行，但仍"Converting circular structure to JSON"错误

Question

我得到以下错误：

TypeError：将循环结构转换为JSON

at JSON.stringify (<anonymous>)
at stringify (/usr/local/lib/node_modules/firebase-tools/node_modules/express/lib/response.js:1123:12)
at ServerResponse.json (/usr/local/lib/node_modules/firebase-tools/node_modules/express/lib/response.js:260:14)
at cors (/Users/landing-page-backend/functions/zohoCrmHook.js:45:43)
at process._tickCallback (internal/process/next_tick.js:68:7)

用于我的createLead函数中的HTTP响应，尽管该函数执行正确并完成了它应该做的事情(即在我的CRM中创建一个条目(。

我在下面的代码中指出了错误发生的地方：

const axios = require('axios');
const functions = require('firebase-functions');
const cors = require('cors')({ origin: true })
const clientId = functions.config().zoho.client_id;
const clientSecret = functions.config().zoho.client_secret;
const refreshToken = functions.config().zoho.refresh_token;
const baseURL = 'https://accounts.zoho.com';

module.exports = (req, res) => {
cors(req, res, async () => {        
const newLead = {
'data': [
{
'Email': String(req.body.email),
'Last_Name': String(req.body.lastName),
'First_Name': String(req.body.firstName),
}
],
'trigger': [
'approval',
'workflow',
'blueprint'
]
};

const { data } = await getAccessToken();
const accessToken = data.access_token;
const leads = await getLeads(accessToken);
const result = checkLeads(leads.data.data, newLead.data[0].Email);

if (result.length < 1) {
try {
return res.json(await createLead(accessToken, newLead)); // this is where the error occurs
} catch (e) {
console.log(e); 
}
} else {
return res.json({ message: 'Lead already in CRM' })
}
})
}
function getAccessToken () {
const url = `https://accounts.zoho.com/oauth/v2/token?refresh_token=${refreshToken}&client_id=${clientId}&client_secret=${clientSecret}&grant_type=refresh_token`;

return new Promise((resolve, reject) => {
axios.post(url)
.then((response) => {
return resolve(response);
})
.catch(e => console.log("getAccessToken error", e))
});
}
function getLeads(token) {
const url = 'https://www.zohoapis.com/crm/v2/Leads';

return new Promise((resolve, reject) => {
axios.get(url, {
headers: {
'Authorization': `Zoho-oauthtoken ${token}`
}
})
.then((response) => {
return resolve(response);
})
.catch(e => console.log("getLeads error", e))
})
}

function createLead(token, lead) {
const url = 'https://www.zohoapis.com/crm/v2/Leads';
return new Promise((resolve, reject) => {
const data = JSON.stringify(lead);
axios.post(url, data, {
headers: {
'Authorization': `Zoho-oauthtoken ${token}`
}
})
.then((response) => {
console.log("response in createLead", response)
return resolve(response);
})
.catch(e => reject(e))
})
}
function checkLeads(leads, currentLead) {
return leads.filter(lead => lead.Email === currentLead)
}

Console.logging所有参数表明它们不是问题所在。Zoho API的配置也不是问题，考虑到条目被正确地写入CRM的事实。我的假设是，这将与JSON格式的HTTP响应有关。

Answer 1

您正在尝试将promise转换为JSON，但没有成功。createLead函数返回的是promise，而不是JSON。promise是"循环对象"。