To get all query parameter values from a GET request, you can use the @Query() decorator function from the @nestjs/common module inside the parameter brackets of the controller's respective method in Nestjs.
TL;DR
import { Controller, Get, Query } from "@nestjs/common";
// basic controller for `/hello` GET endpoint
@Controller("/hello")
export class AppController {
@Get()
// 👇🏽 Using the `@Query()` decorator function to
// get all the query parameters in the request
getHello(@Query() query: { name: string }): string {
return `Hello ${query.name}`;
}
}
/*
CONCLUSION: 🎬
If we now send a `GET` request to `/hello?name=John`
we will get a response of -> `Hello John`
*/
For example, let's say we have a basic GET controller that has an endpoint called /hello and on requesting to it gives us a response called Hello World like this,
import { Controller, Get } from "@nestjs/common";
// basic controller for `/hello` GET endpoint
@Controller("/hello")
export class AppController {
@Get()
getHello(): string {
return `Hello World`;
}
}
NOTE: To know more about creating a GET request in Nestjs, See the blog on How to make a simple GET request or an API endpoint in Nestjs?
Now let's say we need to have a query parameter called name and on request to the /hello?name=John GET request endpoint, it should return a response of Hello John.
So to achieve this first, we have to import the @Query() decorator function from the @nestjs/common module.
It can be done like this,
import { Controller, Get, Query } from "@nestjs/common";
// basic controller for `/hello` GET endpoint
@Controller("/hello")
export class AppController {
@Get()
getHello(): string {
return `Hello World`;
}
}
Now we need to use the @Query() decorator function inside the respective function's parameters brackets.
After the decorator function, we can write a variable name let's call it query where it will contain the query parameters values from the request as an object type. After the query parameter object variable, we can write the type for each query parameter in the request.
It can be done like this,
import { Controller, Get, Query } from "@nestjs/common";
// basic controller for `/hello` GET endpoint
@Controller("/hello")
export class AppController {
@Get()
// 👇🏽 Using the `@Query()` decorator function to
// get all the query parameters in the request
getHello(@Query() query: { name: string }): string {
return `Hello World`;
}
}
Now after defining the query query parameters object variable, let's now use the name query parameter in the return statement of the method so that we will get a response of Hello <name> when we request to /hello GET request endpoint with the name query parameter.
It can be done like this,
import { Controller, Get, Query } from "@nestjs/common";
// basic controller for `/hello` GET endpoint
@Controller("/hello")
export class AppController {
@Get()
// 👇🏽 Using the `@Query()` decorator function to
// get all the query parameters in the request
getHello(@Query() query: { name: string }): string {
return `Hello ${query.name}`;
}
}
/*
CONCLUSION: 🎬
If we now send a `GET` request to `/hello?name=John`
we will get a response of -> `Hello John`
*/
Now if we send a GET request to /hello?name=John we will get a response that looks like this,
Hello John
We have successfully got all the query parameters from a GET request in Nestjs. Yay 🥳!
See the above code live in codesandbox.
That's all 😃!
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