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node.jsreactjsexpressnestjs

how to I get a user's IP address when separate client and server apps, in Node with Nest.js

I have two apps, one front end (react.js) and one a REST API back-end(nest.js based on express.js). How do I get the IP address of the user accessing the back-end when the front-end client makes a request to the back-end?

I checked this question and try the solutions

With separate client and server apps, how do I get a user's IP address, in Node with Koa?

Express.js: how to get remote client address

but I get server IP of front-end not client IP.

Is there a way without any change in front-end app, I get real client IP in nest.js?

Solution

  • You may install a library called request-ip:

    npm i --save request-ip
npm i --save-dev @types/request-ip

    In main.ts file inject request-ip middleware within your app:

    app.use(requestIp.mw());

    Now you can access clientIp from request object:

    req.clientIp

    Another way is by defining a decorator:

    import { createParamDecorator } from '@nestjs/common';
import * as requestIp from 'request-ip';

export const IpAddress = createParamDecorator((data, req) => {
    if (req.clientIp) return req.clientIp;
    return requestIp.getClientIp(req);
});

    And you can use the decorator in controller:

    @Get('/users')
async users(@IpAddress() ipAddress){
}

    Check the following issue in github.