Can you tell me the meaning of this error message: "The variable 'ParsedQs' cannot be assigned to a variable of type 'string'."

Question

Can you tell me the meaning of this error message: "The variable 'ParsedQs' cannot be assigned to a variable of type 'string'."

Hey there, I'm facing an issue with using the search query of mongoose. I want to make a get request using a query, but it seems that it's not possible. I'm puzzled by this error as I'm currently working with version 5.10.0 of mongoose.

I prefer not to use a post request or req.body. Can someone provide some assistance?

Here's my code snippet:

export const searching = (req: Request, res: Response) => {
  Company.find({ $text: { $search: req.query } }).exec((err, docs) => {
    if (docs) {
      res.status(200).json(docs)
    } else {
      console.log(err)
    }
  })
}

And here's the error message I am getting:

(property) $search: string
No overload matches this call.
The last overload gave the following error.
Type 'ParsedQs' is not assignable to type 'string'.ts(2769)

javascript mongodb typescript express mongoose

Answer 1

Answer №1

req.query contains the request query in an object

For example, when sending a request to the endpoint like this /?foo=bar&a=123

You can retrieve the query values as follows:

req.query.foo // bar
req.query.a // 123

When passing the query object to $search, remember that a string should be passed instead. It should look something like this:

Company.find({ $text: { $search: req.query.yourQueryKey as string } }).exec((err, docs) => {

A more effective solution would be to type your RequestHandler function

import {RequestHandler} from "express";

type Params = {};
type ResBody = {};
type ReqBody = {};
type ReqQuery = {
    query: string;
}

export const searching: RequestHandler<Params, ResBody, ReqBody, ReqQuery> = (req, res) => {
    const query = req.query.query; // string
}

For an even better approach, consider typing your RequestHandler function and utilizing a validation library such as joi or celebrate

Answer 2

req.query contains the request query in an object

For example, when sending a request to the endpoint like this /?foo=bar&a=123

You can retrieve the query values as follows:

req.query.foo // bar
req.query.a // 123

When passing the query object to $search, remember that a string should be passed instead. It should look something like this:

Company.find({ $text: { $search: req.query.yourQueryKey as string } }).exec((err, docs) => {

A more effective solution would be to type your RequestHandler function

import {RequestHandler} from "express";

type Params = {};
type ResBody = {};
type ReqBody = {};
type ReqQuery = {
    query: string;
}

export const searching: RequestHandler<Params, ResBody, ReqBody, ReqQuery> = (req, res) => {
    const query = req.query.query; // string
}

For an even better approach, consider typing your RequestHandler function and utilizing a validation library such as joi or celebrate

Answer 3

Answer №2

When you pass req.query to your search function, the default Typescript type for req.query is

Request<unknown, unknown, unknown, QueryString.ParsedQs, Record<string, any>>.query: QueryString.ParsedQs

If you were to pass in req.query.searchText, the type for that would be

string | QueryString.ParsedQs | string[] | QueryString.ParsedQs[] | undefined

The recommended solution is to use the following code:

export const performSearch = (req: Request, res: Response) => { 
const searchText = req.query.searchText as string
  Company.find({ $text: { $search: searchText } }).exec((err, docs) => {
    if (docs) {
      res.status(200).json(docs)
    } else {
      console.log(err)
    }
  })
}

While this method is effective, it can become messy when dealing with multiple variables from query params. In Express, consider trying out the RequestHandler for your endpoints.

import { RequestHandler } from 'express'

interface QueryTypes {
  searchText: string
  moreSearchText: string
}
export const performSearch:RequestHandler<unknown, unknown, unknown, QueryTypes > = (req, res) => {
  Company.find({ $text: { $search: req.query } }).exec((err, docs) => {
    if (docs) {
      res.status(200).json(docs)
    } else {
      console.log(err)
    }
  })
}

By using RequestHandler, I can specify specific types for parameters, body, reqbody, or query. This adds type safety and helps prevent errors in the code.

If I try to access a property not defined in my QueryTypes interface like

const test = req.query.test

I will receive a typescript error alerting me of the issue.

Answer 4

When you pass req.query to your search function, the default Typescript type for req.query is

Request<unknown, unknown, unknown, QueryString.ParsedQs, Record<string, any>>.query: QueryString.ParsedQs

If you were to pass in req.query.searchText, the type for that would be

string | QueryString.ParsedQs | string[] | QueryString.ParsedQs[] | undefined

The recommended solution is to use the following code:

export const performSearch = (req: Request, res: Response) => { 
const searchText = req.query.searchText as string
  Company.find({ $text: { $search: searchText } }).exec((err, docs) => {
    if (docs) {
      res.status(200).json(docs)
    } else {
      console.log(err)
    }
  })
}

While this method is effective, it can become messy when dealing with multiple variables from query params. In Express, consider trying out the RequestHandler for your endpoints.

import { RequestHandler } from 'express'

interface QueryTypes {
  searchText: string
  moreSearchText: string
}
export const performSearch:RequestHandler<unknown, unknown, unknown, QueryTypes > = (req, res) => {
  Company.find({ $text: { $search: req.query } }).exec((err, docs) => {
    if (docs) {
      res.status(200).json(docs)
    } else {
      console.log(err)
    }
  })
}

By using RequestHandler, I can specify specific types for parameters, body, reqbody, or query. This adds type safety and helps prevent errors in the code.

If I try to access a property not defined in my QueryTypes interface like

const test = req.query.test

I will receive a typescript error alerting me of the issue.

Answer 5

Answer №3

Simple and efficient fix

If you've landed here from a search, there may be an easier solution for your specific scenario compared to other suggestions provided here.

Error Demonstration:

const foo: string | null = req.query.bar || null 

// Type 'ParsedQs' is not assignable to type 'string'

Successful Approach:

const foo: string | null = <string>req.query.bar || null
// No Type errors

There are potential risks associated with this inline type declaration approach. However, if you are confident that your values will always be strings and you wish to avoid extensive type definitions in your code, opting for a straightforward solution like this could be beneficial.

Answer 6

Simple and efficient fix

If you've landed here from a search, there may be an easier solution for your specific scenario compared to other suggestions provided here.

Error Demonstration:

const foo: string | null = req.query.bar || null 

// Type 'ParsedQs' is not assignable to type 'string'

Successful Approach:

const foo: string | null = <string>req.query.bar || null
// No Type errors

There are potential risks associated with this inline type declaration approach. However, if you are confident that your values will always be strings and you wish to avoid extensive type definitions in your code, opting for a straightforward solution like this could be beneficial.

Answer 7

Answer №4

req.query is a built-in object in Express that stores all the query parameters provided in the request URL.

If your request is structured like this

example.com/search/?q=query

The value of query will be accessible through req.query.q.

Another approach is to utilize named route parameters.

For instance:

Request URL

example.com/search/query

Route

app.get('/search/:query', (req, res) => {
   console.log(req.params.query); // Output: "query". Remember to use req.params instead of req.query
})

Answer 8

req.query is a built-in object in Express that stores all the query parameters provided in the request URL.

If your request is structured like this

example.com/search/?q=query

The value of query will be accessible through req.query.q.

Another approach is to utilize named route parameters.

For instance:

Request URL

example.com/search/query

Route

app.get('/search/:query', (req, res) => {
   console.log(req.params.query); // Output: "query". Remember to use req.params instead of req.query
})

Answer 9

Answer №5

To accomplish this task, you can follow a similar approach:

const newStory = async (requestData: Request, responseData: Response) => {
const result = await userStoryService.generate(requestData.body, requestData.query);

function createStory(payload: StoryUser, queryParams: { teamLead?: string }) {

Answer 10

To accomplish this task, you can follow a similar approach:

const newStory = async (requestData: Request, responseData: Response) => {
const result = await userStoryService.generate(requestData.body, requestData.query);

function createStory(payload: StoryUser, queryParams: { teamLead?: string }) {

Can you tell me the meaning of this error message: "The variable 'ParsedQs' cannot be assigned to a variable of type 'string'."

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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