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4.0.3 • Public • Published


Ethereum RPC errors, including for Ethereum JSON RPC and Ethereum Provider, and making unknown errors compliant with either spec.

Basic Usage

In TypeScript or JavaScript:

import { ethErrors } from 'eth-rpc-errors'

throw ethErrors.provider.unauthorized()
// or
throw ethErrors.provider.unauthorized('my custom message')

Supported Errors


Installation: npm install eth-rpc-errors or yarn add eth-rpc-errors

import or require as normal (no default export).

The package is implemented in TypeScript, and all exports are typed.

Errors API

import { ethErrors } from 'eth-rpc-errors'

// Ethereum RPC errors are namespaced under "ethErrors.rpc"
response.error = ethErrors.rpc.methodNotFound({
  message: optionalCustomMessage, data: optionalData

// Provider errors namespaced under ethErrors.provider
response.error = ethErrors.provider.unauthorized({
  message: optionalCustomMessage, data: optionalData

// each error getter takes a single "opts" argument
// for most errors, this can be replaced with a single string, which becomes
// the error message
response.error = ethErrors.provider.unauthorized(customMessage)

// if an error getter accepts a single string, all arguments can be omitted
response.error = ethErrors.provider.unauthorized()
response.error = ethErrors.provider.unauthorized({})

// omitting the message will produce an error with a default message per
// the relevant spec

// omitting the data argument will produce an error without a
// "data" property

// the JSON RPC 2.0 server error requires a valid code
response.error = ethErrors.rpc.server({
  code: -32031

// custom Ethereum Provider errors require a valid code and message
// valid codes are integers i such that: 1000 <= i <= 4999
response.error = ethErrors.provider.custom({
  code: 1001, message: 'foo'

Parsing Unknown Errors

// this is useful for ensuring your errors are standardized
import { serializeError } from 'eth-rpc-errors'

// if the argument is not a valid error per any supported spec,
// it will be added as
response.error = serializeError(maybeAnError)

// you can add a custom fallback error code and message if desired
const fallbackError = { code: 4999, message: 'My custom error.' }
response.error = serializeError(maybeAnError, fallbackError)

// Note: if the original error has a "message" property, it will take
// precedence over the fallback error's message

// the default fallback is:
  code: -32603,
  message: 'Internal JSON-RPC error.'

Other Exports

 * Classes
import { EthereumRpcError, EthereumProviderError } from 'eth-rpc-errors'

 * getMessageFromCode and errorCodes
import { getMessageFromCode, errorCodes } from 'eth-rpc-errors'

// get the default message string for the given code, or a fallback message if
// no message exists for the given code
const message1 = getMessageFromCode(someCode)

// you can specify your own fallback message
const message2 = getMessageFromCode(someCode, myFallback)
// it can be anything, use at your own peril
const message3 = getMessageFromCode(someCode, null)

// {
//   rpc: { [errorName]: code, ... },
//   provider: { [errorName]: code, ... },
// }
const code1 = errorCodes.rpc.parse
const code2 = errorCodes.provider.userRejectedRequest

// all codes in errorCodes have default messages
const message4 = getMessageFromCode(code1)
const message5 = getMessageFromCode(code2)



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