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  • import {_, KeywordCxt} from Ajv
    
    ajv.addKeyword({
      keyword: "even",
      type: "number",
      schemaType: "boolean",
      // $data: true // to support [$data reference](./guide/combining-schemas.md#data-reference), ...
      code(cxt: KeywordCxt) {
        const {data, schema} = cxt
        const op = schema ? _`!==` : _`===`
        cxt.fail(_`${data} %2 ${op} 0`) // ... the only code change needed is to use `cxt.fail$data` here
      },
    })
    
    const schema = {even: true}
    const validate = ajv.compile(schema)
    console.log(validate(2)) // true
    console.log(validate(3)) // false
    
    Docs
  • ajv.addKeyword({
      keyword: "constant",
      validate: (schema, data) =>
        typeof schema == "object" && schema !== null ? deepEqual(schema, data) : schema === data,
      errors: false,
    })
    
    const schema = {
      constant: 2,
    }
    const validate = ajv.compile(schema)
    console.log(validate(2)) // true
    console.log(validate(3)) // false
    
    const schema = {
      constant: {foo: "bar"},
    }
    const validate = ajv.compile(schema)
    console.log(validate({foo: "bar"})) // true
    console.log(validate({foo: "baz"})) // false
    
    Docs
  • //...
    const conf = require('../conf');
    
    const ajv = new Ajv({
        schemaId: 'auto',
        allErrors: true,
        verbose: true,
    });
    
    ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-04.json'));
    ajv.addMetaSchema(require('ajv/lib/refs/json-schema-draft-06.json'));
    
    function URIfromId(id) {
        return url.parse(id).path;
    }
    
    
    
    //...
    
    /openintegrationhub/openintegrationhub apache-2.0
  • const ajv = new Ajv()
    
    ajv.addKeyword({
      keyword: "idExists",
      async: true,
      type: "number",
      validate: checkIdExists,
    })
    
    async function checkIdExists(schema, data) {
      // this is just an example, you would want to avoid SQL injection in your code
      const rows = await sql(`SELECT id FROM ${schema.table} WHERE id = ${data}`)
      return !!rows.length // true if record is found
    }
    
    const schema = {
      $async: true,
      properties: {
        userId: {
          type: "integer",
          idExists: {table: "users"},
        },
        postId: {
          type: "integer",
          idExists: {table: "posts"},
        },
      },
    }
    
    const validate = ajv.compile(schema)
    
    validate({userId: 1, postId: 19})
      .then(function (data) {
        console.log("Data is valid", data) // { userId: 1, postId: 19 }
      })
      .catch(function (err) {
        if (!(err instanceof Ajv.ValidationError)) throw err
        // data is invalid
        console.log("Validation errors:", err.errors)
      })
    
    Docs
  • ajv.addKeyword({
      keyword: "range",
      type: "number",
      schemaType: "array",
      implements: "exclusiveRange",
      compile: ([min, max], parentSchema) =>
        parentSchema.exclusiveRange === true
          ? (data) => data > min && data < max
          : (data) => data >= min && data <= max,
    })
    
    const schema = {range: [2, 4], exclusiveRange: true}
    const validate = ajv.compile(schema)
    console.log(validate(2.01)) // true
    console.log(validate(3.99)) // true
    console.log(validate(2)) // false
    console.log(validate(4)) // false
    
    Docs
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