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2.10.1 • Public • Published

Hardhat ABI Exporter

Export Ethereum smart contract ABIs on compilation via Hardhat.

Versions of this plugin prior to 2.0.0 were released as buidler-abi-exporter.


npm install --save-dev hardhat-abi-exporter
# or
yarn add --dev hardhat-abi-exporter


Load plugin in Hardhat config:


Add configuration under the abiExporter key:

option description default
path path to ABI export directory (relative to Hardhat root) './abi'
runOnCompile whether to automatically export ABIs during compilation false
clear whether to delete old ABI files in path on compilation false
flat whether to flatten output directory (may cause name collisions) false
only Array of String matchers used to select included contracts, defaults to all contracts if length is 0 []
except Array of String matchers used to exclude contracts []
spacing number of spaces per indentation level of formatted output 2
pretty whether to use interface-style formatting of output for better readability false
format format type ("json", "minimal", "fullName"). Alternative to pretty json
filter Function with signature (abiElement: any, index: number, abi: any, fullyQualifiedName: string) => boolean used to filter elements from each exported ABI () => true
rename Function with signature (sourceName: string, contractName: string) => string used to rename an exported ABI (incompatible with flat option) undefined

Note that the configuration formatted as either a single Object, or an Array of objects. An Array may be used to specify multiple outputs.

abiExporter: {
  path: './data/abi',
  runOnCompile: true,
  clear: true,
  flat: true,
  only: [':ERC20$'],
  spacing: 2,
  pretty: true,
  format: "minimal",

// or

abiExporter: [
    path: './abi/pretty',
    pretty: true,
    path: './abi/ugly',
    pretty: false,

// or

abiExporter: [
    path: './abi/json',
    format: "json",
    path: './abi/minimal',
    format: "minimal",
    path: './abi/fullName',
    format: "fullName",

The included Hardhat tasks may be run manually:

npx hardhat export-abi
npx hardhat clear-abi
# or
yarn run hardhat export-abi
yarn run hardhat clear-abi

By default, the hardhat compile task is run before exporting ABIs. This behavior can be disabled with the --no-compile flag:

npx hardhat export-abi --no-compile
# or
yarn run hardhat export-abi --no-compile

The path directory will be created if it does not exist.

The clear option is set to false by default because it represents a destructive action, but should be set to true in most cases.

ABIs files are saved in the format [CONTRACT_NAME].json.

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  • itsnickbarry