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<div class="breadcrumbs"><a href="/v5/">Documentation</a> » <a href="/v5/api/">API</a> » <a href="/v5/api/utils/">Utilities</a> » <span class="current">Application Binary Interface</span></div>
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<a name="application-binary-interface"></a><h1 class="show-anchors"><div>Application Binary Interface<div class="anchors"><a class="self" href="/v5/api/utils/abi/#application-binary-interface"></a></div></div></h1><p>An <b>Application Binary Interface</b> (ABI) is a collection of <a href="/v5/api/utils/abi/fragments/#Fragment">Fragments</a> which specify how to interact with various components of a Contract.</p>
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<p>An <a href="/v5/api/utils/abi/interface/">Interface</a> helps organize Fragments by type as well as provides the functionality required to encode, decode and work with each component.</p>
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<p>Most developers will not require this low-level access to encoding and decoding the binary data on the network and will most likely use a <a href="/v5/api/contract/contract/">Contract</a> which provides a more convenient interface. Some framework, tool developers or developers using advanced techniques may find these classes and utilities useful.</p>
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<div class="toc"><div style="padding-left: 0px"><span class="bullet">•</span><a href="/v5/api/utils/abi/coder/">AbiCoder</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/coder/#AbiCoder--creating">Creating Instance</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/coder/#AbiCoder--methods">Coding Methods</a></div><div style="padding-left: 0px"><span class="bullet">•</span><a href="/v5/api/utils/abi/formats/">ABI Formats</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/formats/#abi-formats--human-readable-abi">Human-Readable ABI</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/formats/#abi-formats--solidity">Solidity JSON ABI</a></div><div style="padding-left: 0px"><span class="bullet">•</span><a href="/v5/api/utils/abi/fragments/">Fragments</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/fragments/#fragments--formats">Formats</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/fragments/#Fragment">Fragment</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/fragments/#ConstructorFragment">ConstructorFragment</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/fragments/#EventFragment">EventFragment</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/fragments/#FunctionFragment">FunctionFragment</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/fragments/#ParamType">ParamType</a></div><div style="padding-left: 0px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/">Interface</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--creating">Creating Instances</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--properties">Properties</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--formatting">Formatting</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--fragments">Fragment Access</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--selectors">Signature and Topic Hashes</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--encoding">Encoding Data</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--decoding">Decoding Data</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--parsing">Parsing</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--types">Types</a></div><div style="padding-left: 28px"><span class="bullet">•</span><a href="/v5/api/utils/abi/interface/#Interface--specifying-fragments">Specifying Fragments</a></div></div>
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