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Results tagged with web3js
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user 70974
Javascript API and library for Ethereum To develop applications on Ethereum, you can use the web3 object provided by the web3.js library. Under the hood it communicates to a local node through RPC calls. web3.js works with any Ethereum node, which exposes an RPC layer. https://github.com/ethereum/wiki/wiki/JavaScript-API
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How best to replay all events from genesis using web3
Do you use a local node ? Because if you use a service it will be limited to 2M5 queries.
Maybe try {fromBlock : 1} ?
- 365
0
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I can't load web3. I keep getting this console error how do I fix it?
You can't use "require" in browser html file, you have to import it with to use web3js client size. …
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1
vote
1
answer
785
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Get data from smart contract interaction before or whitout sending transaction
I have a contract with an ABI and I'm currently interacting with it on ropsten network.
I have this function that ask metamask to sign transaction, it's a smart contract interaction and I transfer a N …
- 365
1
vote
0
answers
447
views
0
votes
Accessing contract data for offchain analysis
Then you can load this address+ABI on web3js (or other library, ethereumJS) and then ask in loop what are data for each mapping. …
- 365
-1
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How to distingih between a dApp and a webapp?
Yes if there is web3 component it's for interacting with a blockchain, so it's a dapp.
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0
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Which transaction comes first in a block?
I don't think they are executed one after another, they are pretty much in a same block, so a block is like a "tick" for the network.
Most smart contract implement a feature that forbid people to have …
- 365
2
votes
How can I save e-mails in my contract in secure way?
Everything you write on your blockchain is open and anybody in the world can read it. Plus, it will cost your user something like $1 to $10 to give up his information to the world.
Why do you want to …
- 365
2
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Is it possible for web3 to listen to contract function call ? (For example mint() for a NFT)
You need your smart contract address, your ABI and web3js.
But you need also a node that actually work with ethereum blockchain. …
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