[Home](./index.md) > [@contract-case/case-definition-dsl](./case-definition-dsl.md) > [matchers](./case-definition-dsl.matchers.md) > [base](./case-definition-dsl.matchers.base.md) > [AnyMatcher](./case-definition-dsl.matchers.base.anymatcher.md) ## matchers.base.AnyMatcher class The base class for all Test Equivalence Matchers. Extend this if you don't have an example in your Matcher. Otherwise, use `AnyMatcherWithExample` **Signature:** ```typescript export declare abstract class AnyMatcher ``` ## Constructors

Constructor	Modifiers	Description
[(constructor)(matcherType)](./case-definition-dsl.matchers.base.anymatcher._constructor_.md)		The base class for all Test Equivalence Matchers. Extend this if you don't have an example in your Matcher. Otherwise, use Matcher strings beginning with `_case:` are reserved for the default ContractCase matchers. Only use a types prefixed with `_case:` if you wish to create a special case for a matching behaviour that is already provided by a core ContractCase matcher.

## Methods

Method	Modifiers	Description
[toJSON()](./case-definition-dsl.matchers.base.anymatcher.tojson.md)		Only override this method if you are writing a matcher in a language other than TypeScript. It exists because the ContractCase matcher format is not legal in all languages that ContractCase supports. WARNING: Do not return a string from this method. You must instead return an object that can be serialised to JSON following the matcher format described in [Extending ContractCase](https://case.contract-testing.io/docs/reference/plugin-framework).