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Questions tagged [polkadot-js]

This library provides a clean wrapper around all the methods exposed by a Polkadot/Subtrate network client and defines all the types exposed by a node.

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88 questions
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How to decode block extrinsics using Polkadot js api

I am writing typescript code to get block information. I am connected to wss://kusama-rpc.polkadot.io . I am followig official polkadot js api documentation . I am calling api.rpc.chain.getBlock method get block information, and it returns block…
Bopsi
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How do I update my token's name in Substrate?

I have set up a custom Substrate chain, and I want to modify the display name of my token. What do I need to modify such that Polkadot JS and other APIs can discover my token name? By default it is "Unit".
Shawn Tabrizi
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How to encode the hex string representation of an account id in Substrate using Rust?

Given a hex representation: 0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d, we can get the AccountId it represents using keyring.encodeAddress() using JavaScript. However, what is the corresponding function in Rust? AccountId is…
Aviral Srivastava
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How can I subscribe to a single event using Polkadot.js API?

I want to subscribe to a single event (or a list of events) using the Polkadot.js API. However, I have only found information on how to traverse events and then filter the results. In addition, the documentation about events lists all the events…
Daniel Bastos
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Public key / Private key encryption using polkadot lib?

I'm building a substrate blockchain backed by polkadot js. While working on a task I have a requirement of public/private key encryption and decryption. for ex: Bob wants to send Alice an encrypted email. To do this, Bob takes Alice's public key and…
sachin murali
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2 answers

Use custom types (Substrate FRAME pallet + Polkadot/Substrate frontend)

Scenario: You are developing a FRAME pallet for a custom Substrate node that uses custom types within Storage or Events. To interact with your custom Substrate node, you use the Polkadot/Substrate frontend Problem: When you query the storage that…
sea212
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How do you format balances with the Polkadot JS API?

I would like to get the balance of a user formatted using the base unit of the Substrate chain. When I use toHuman(), I get an opinionated formatting which includes a prefix like so: let account = await…
Shawn Tabrizi
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Connect via WSS to Polkadot Full Noder running on local network failed

I have setup a Full Node running at a local server at 192.168.2.254. I'm just trying to make a simple script which is basically subscribe to new heads on the blockchain. const { ApiPromise, WsProvider } = require('@polkadot/api'); async function…
Minh Tran Duc
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Using api.rpc.payment.queryFeeDetails to get extrinsic fee

I want to use api.rpc.payment.queryFeeDetails api call ( https://polkadot.js.org/docs/substrate/rpc#queryfeedetailsextrinsic-bytes-at-blockhash-feedetails) to get information about fees of a specific extrinsic in a Substrate blockchain. I'm using…
Mario Pino Uceda
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What are the Proof-of-Stake[PoS] algorithms available

What are the Proof-of-Stake[PoS] algorithms available which can be configured on substrate-node-template
Kiran Kumar HM
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Use custom Substrate node name (Substrate FRAME pallet + Polkadot/Substrate frontend)

Scenario: You want to submit an extrinsic to your custom Substrate node based on the substrate-node-template by using the Polkadot/Substrate frontend. You have renamed the Substrate node either manually by carefully searching and replacing all…
sea212
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Error Connecting to Substrate: Unable to initialize the API: createType(StorageKey):: Derived

I've got a Substrate node running locally on my PC, following this tutorial. https://substrate.dev/docs/en/tutorials/create-your-first-substrate-chain/interact. It can be viewed on two ports: Local: …
Sarah Kay
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How to access the `Alice` account on a Parity Substrate developer chain?

The Substrate Collectables Workshop suggests at some point that the developer chain comes with a prefunded account for Alice. Let's go into the Transfer app, and make a transaction. The default account named "Alice" is pre-funded with a ton of…
q9f
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An Reference Error is occured at "@polkadot/extension-dapp/bundle.js"

I tried to implement a simple UI for smart contracts using polkadot.js in the next.js framework. The content of the WEB UI is a simple one that calls the Flipper contract, which is famous for the sample contract of the substrate. When compiling,…
s.Takahashi
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How can I decode events help on substrate using polkadot-js?

I have a base smart contract in Rust with package manager Cargo. In that smart contract, I have some events which I'm emitting while function calling. For listing those events, I have a service in JavaScript, but I'm not sure how to decode that…
Puneet Jindal
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