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  • require("ajv-keywords")(ajv, "transform")
    
    const schema = {
      type: "array",
      items: {
        type: "string",
        transform: ["trim", "toLowerCase"],
      },
    }
    
    const data = ["  MixCase  "]
    ajv.validate(schema, data)
    console.log(data) // ['mixcase']
    
    Docs
  • require("ajv-keywords")(ajv, ["transform"])
    
    const schema = {
      type: "array",
      items: {
        type: "string",
        transform: ["trim", "toEnumCase"],
        enum: ["pH"],
      },
    }
    
    const data = ["ph", " Ph", "PH", "pH "]
    ajv.validate(schema, data)
    console.log(data) // ['pH','pH','pH','pH']
    
    Docs
  • const Ajv = require("ajv")
    const ajv = new Ajv()
    require("ajv-keywords")(ajv)
    
    ajv.validate({instanceof: "RegExp"}, /.*/) // true
    ajv.validate({instanceof: "RegExp"}, ".*") // false
    
    Docs
  • ajv.addKeyword({
      keyword: "range",
      type: "number",
      compile([min, max], parentSchema) {
        return parentSchema.exclusiveRange === true
          ? (data) => data > min && data < max
          : (data) => data >= min && data <= max
      },
      errors: false,
      metaSchema: {
        // schema to validate keyword value
        type: "array",
        items: [{type: "number"}, {type: "number"}],
        minItems: 2,
        additionalItems: false,
      },
    })
    
    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
  • 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
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