## @aeternity/aepp-sdk/es/tx/builder JavaScript-based Transaction builder **Example** ```js import Transaction from '@aeternity/aepp-sdk/es/tx/builder' ``` * [@aeternity/aepp-sdk/es/tx/builder](#module_@aeternity/aepp-sdk/es/tx/builder) * [exports.calculateFee(fee, txType, options)](#exp_module_@aeternity/aepp-sdk/es/tx/builder--exports.calculateFee) ⇒ `String` \| `Number` ⏏ * [exports.validateParams(params, schema, excludeKeys)](#exp_module_@aeternity/aepp-sdk/es/tx/builder--exports.validateParams) ⇒ `Object` ⏏ * [exports.buildRawTx(params, schema, [options])](#exp_module_@aeternity/aepp-sdk/es/tx/builder--exports.buildRawTx) ⇒ `Array` ⏏ * [exports.unpackRawTx(binary, schema)](#exp_module_@aeternity/aepp-sdk/es/tx/builder--exports.unpackRawTx) ⇒ `Object` ⏏ * [exports.buildTx(params, type, [options])](#exp_module_@aeternity/aepp-sdk/es/tx/builder--exports.buildTx) ⇒ `Object` ⏏ * [exports.unpackTx(encodedTx, fromRlpBinary)](#exp_module_@aeternity/aepp-sdk/es/tx/builder--exports.unpackTx) ⇒ `Object` ⏏ ### exports.calculateFee(fee, txType, options) ⇒ `String` \| `Number` ⏏ Calculate fee **Kind**: Exported function **rtype**: `(fee, txType, gas = 0) => String` | Param | Type | Description | | --- | --- | --- | | fee | `String` \| `Number` | fee | | txType | `String` | Transaction type | | options | `Options` | Options object | | options.gas | `String` \| `Number` | Gas amount | | options.params | `Object` | Tx params | **Example** ```js calculateFee(null, 'spendTx', { gas, params }) ``` ### exports.validateParams(params, schema, excludeKeys) ⇒ `Object` ⏏ Validate transaction params **Kind**: Exported function **Returns**: `Object` - Object with validation errors | Param | Type | Description | | --- | --- | --- | | params | `Object` | Object with tx params | | schema | `Array` | Transaction schema | | excludeKeys | `Array` | Array of keys to exclude for validation | ### exports.buildRawTx(params, schema, [options]) ⇒ `Array` ⏏ Build binary transaction **Kind**: Exported function **Returns**: `Array` - Array with binary fields of transaction **Throws**: - `Error` Validation error | Param | Type | Default | Description | | --- | --- | --- | --- | | params | `Object` | | Object with tx params | | schema | `Array` | | Transaction schema | | [options] | `Object` | {} | options | | [options.excludeKeys] | `Object` | | excludeKeys Array of keys to exclude for validation and build | ### exports.unpackRawTx(binary, schema) ⇒ `Object` ⏏ Unpack binary transaction **Kind**: Exported function **Returns**: `Object` - Object with transaction field's | Param | Type | Description | | --- | --- | --- | | binary | `Array` | Array with binary transaction field's | | schema | `Array` | Transaction schema | ### exports.buildTx(params, type, [options]) ⇒ `Object` ⏏ Build transaction hash **Kind**: Exported function **Returns**: `Object` - { tx, rlpEncoded, binary } Object with tx -> Base64Check transaction hash with 'tx_' prefix, rlp encoded transaction and binary transaction **Throws**: - `Error` Validation error | Param | Type | Default | Description | | --- | --- | --- | --- | | params | `Object` | | Object with tx params | | type | `String` | | Transaction type | | [options] | `Object` | {} | options | | [options.excludeKeys] | `Object` | | excludeKeys Array of keys to exclude for validation and build | | [options.prefix] | `String` | | Prefix of transaction | ### exports.unpackTx(encodedTx, fromRlpBinary) ⇒ `Object` ⏏ Unpack transaction hash **Kind**: Exported function **Returns**: `Object` - { tx, rlpEncoded, binary } Object with tx -> Object with transaction param's, rlp encoded transaction and binary transaction | Param | Type | Description | | --- | --- | --- | | encodedTx | `String` \| `Array` | String or RLP encoded transaction array (if fromRlpBinary flag is true) | | fromRlpBinary | `Boolean` | Unpack from RLP encoded transaction (default: false) |