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@fastify/merge-json-schemas\n\n[](https://github.com/fastify/merge-json-schemas/actions/workflows/ci.yml)\n[](https://www.npmjs.com/package/@fastify/merge-json-schemas)\n[](https://github.com/neostandard/neostandard)\n\n__merge-json-schemas__ is a JavaScript library that builds a logical product (AND) for multiple [JSON schemas](https://json-schema.org/draft/2020-12/json-schema-core#name-introduction).\n\n- [Installation](#installation)\n- [Usage](#usage)\n- [API](#api)\n - [mergeSchemas(schemas, options)](#mergeschemasschemas-options)\n - [resolvers](#resolvers)\n - [defaultResolver](#defaultresolver)\n- [License](#license)\n\n\n\n## Installation\n\n```bash\nnpm i @fastify/merge-json-schemas\n```\n\n\n\n## Usage\n\n```javascript\nconst assert = require('node:assert')\nconst { mergeSchemas } = require('@fastify/merge-json-schemas');\n\nconst schema1 = {\n $id: 'schema1',\n type: 'object',\n properties: {\n foo: { type: 'string', enum: ['foo1', 'foo2'] },\n bar: { type: 'string', minLength: 3 }\n }\n}\n\nconst schema2 = {\n $id: 'schema1',\n type: 'object',\n properties: {\n foo: { type: 'string', enum: ['foo1', 'foo3'] },\n bar: { type: 'string', minLength: 5 }\n },\n required: ['foo']\n}\n\nconst mergedSchema = mergeSchemas([schema1, schema2])\nassert.deepStrictEqual(mergedSchema, {\n $id: 'schema1',\n type: 'object',\n properties: {\n foo: { type: 'string', enum: ['foo1'] },\n bar: { type: 'string', minLength: 5 }\n },\n required: ['foo']\n})\n```\n\n\n\n## API\n\n\n\n#### mergeSchemas(schemas, options)\n\nBuilds a logical conjunction (AND) of multiple [JSON schemas](https://json-schema.org/draft/2020-12/json-schema-core#name-introduction).\n\n- `schemas` __\\__ - list of JSON schemas to merge\n- `options` __\\__ - optional options\n - `resolvers` __\\__ - custom resolvers for JSON schema keywords. Each key is the name of a JSON schema keyword. Each value is a resolver function. See [keywordResolver](#keywordresolver-keyword-values-mergedschema-parentschemas-options)\n - `defaultResolver` __\\__ - custom default resolver for JSON schema keywords. See [keywordResolver](#keywordresolver-keyword-values-mergedschema-parentschemas-options)\n - `onConflict` __\\__ - action to take when a conflict is found. Used by the default `defaultResolver`. Default is `throw`. Possible values are:\n - `throw` - throws an error multiple different schemas for the same keyword are found\n - `ignore` - do nothing if multiple different schemas for the same keyword are found\n - `first` - use the value of the first schema if multiple different schemas for the same keyword are found\n\n#### resolvers\n\nA list of default resolvers that __merge-json-schema__ uses to merge JSON schemas. You can override the default resolvers by passing a list of custom resolvers in the `options` argument of `mergeSchemas`. See [keywordResolver](#keywordresolver-keyword-values-mergedschema-parentschemas-options).\n\n#### defaultResolver\n\nA default resolver that __merge-json-schema__ uses to merge JSON schemas. Default resolver is used when no custom resolver is defined for a JSON schema keyword. By default, the default resolver works as follows:\n\n- If only one schema contains the keyword, the value of the keyword is used as the merged value\n- If multiple schemas contain the exact same value for the keyword, the value of the keyword is used as the merged value\n- If multiple schemas contain different values for the keyword, it throws an error\n\n#### keywordResolver (keyword, values, mergedSchema, parentSchemas, options)\n\n__merge-json-schema__ uses a set of resolvers to merge JSON schemas. Each resolver is associated with a JSON schema keyword. The resolver is called when the keyword is found in the schemas to merge. The resolver is called with the following arguments:\n\n- `keyword` __\\__ - the name of the keyword to merge\n- `values` __\\__ - the values of the keyword to merge. The length of the array is equal to the number of schemas to merge. If a schema does not contain the keyword, the value is `undefined`\n- `mergedSchema` __\\__ - an instance of the merged schema\n- `parentSchemas` __\\__ - the list of parent schemas\n- `options` __\\__ - the options passed to `mergeSchemas`\n\nThe resolver must set the merged value of the `keyword` in the `mergedSchema` object.\n\n__Example:__ resolver for the `minNumber` keyword.\n\n```javascript\nfunction minNumberResolver (keyword, values, mergedSchema) {\n mergedSchema[keyword] = Math.min(...values)\n}\n```\n\n\n\n## License\n\nLicensed under [MIT](./LICENSE).\n","_attachments":{},"homepage":"https://github.com/fastify/merge-json-schemas#readme","bugs":{"url":"https://github.com/fastify/merge-json-schemas/issues"},"license":"MIT"}