Questions tagged [express]
The express tag has no usage guidance.
12
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Restricting External Adapter Access to a Specific Smart Contract: Is it Feasible?
How can I ensure that my external adapter is only accessible by a specific contract? Does the Post express middleware in the external adapter have a header key indicating the calling smart contract? I'...
- 11
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11
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Why is it not showing any results in the Table / Collection Section?
this is my transport.request.model
import mongoose from "mongoose";
const schema = new mongoose.Schema({
Transport : String,
Product : String,
Material : String,
Capacity : Number,
...
- 3
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229
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Run express api with hardhat and ethersJS
I am trying to call the ethers js functions which in turn call my smart contract using an express API. I created the APIs but I'm unable to run the server and get the response for the API request.
I ...
- 239
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43
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Is it possible to use cors or something similar to reject all API calls not from a particular ENS Domain, Unstoppable Domain, or IPFS hash?
I love decentralized domain projects. I have worked with Unstoppable Domains, ENS domains, Handshake domains, and even just simple IPNS domains and IPFS hashes. The domain name system used by web2.0 ...
- 361
1
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208
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How to add logo to a web3 personal signature message?
I have generated a signature message from my react js app for the users. But in mobile metamask the message displays a letter D, the first letter of my url, at the top of the message.
But I want to ...
- 163
3
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2
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2k
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Is there any way to listen smart contract events from nodejs-expressjs server?
I am developing a smart contract project and I need to listen events on my expressjs-server. Is it possible to listen events from there?
- 35
2
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1
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407
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How do I listen to Contract Events in my Express App?
I have a Smart Contract rps.
I want my express app to be able to listen to its events.
My express app:
require("dotenv").config();
const express = require("express");
const app = ...
- 103
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1k
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Best practice for Single or Multiple instances of Provider for different types of block chain requests #
What the best practice is in terms of using the ethers provider as either a singleton (or persistent instance) in a module or to create a new instance every time a request is made. For example, for a ...
- 111
5
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1
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Subscribing to events using ethers / hardhat network
I have a basic node express application. It connects to my locally running hardhat network via ethers & websocket. The connection seems to work, since I can query the blockchain succesfully (for ...
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183
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How can a server except a signed tx and pay the gas?
I have a contract where users can buy "credits".
With that credit, users can post a message to a server (a route set up in ExpressJS).
I have the buying of credits working.
But my question ...
- 633
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80
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where to host express api that communicates with smart contract to be fully decentralised?
I need to host express api that communicates with smart contract to be fully decentralised. Any to host it decentralised.
- 173
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491
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UnhandledPromiseRejectionWarning TypeError when deploying multiple contracts (>200) at the same time
I get the following error:
(node:6540) UnhandledPromiseRejectionWarning: TypeError: this.removeListener is not a function
at Object.receipt (c:\Users\pruto\OneDrive\Documents\Smart contracts\...
- 525