validateParam() — fastify Function Reference

Architecture documentation for the validateParam() function in validation.js from the fastify codebase.

Function javascript CoreKernel InstanceFactory called by 1

Entity Profile

CoreKernel→ InstanceFactory→ validateParam() — fastify Function Reference

Dependency Diagram

graph TD
  4340bc1c_3ec7_7049_554d_4377b3a311e0["validateParam()"]
  7c105413_01f0_7169_1c95_0f84d089bea5["validation.js"]
  4340bc1c_3ec7_7049_554d_4377b3a311e0 -->|defined in| 7c105413_01f0_7169_1c95_0f84d089bea5
  208b6483_5f1a_738c_a527_eb1057e24926["validate()"]
  208b6483_5f1a_738c_a527_eb1057e24926 -->|calls| 4340bc1c_3ec7_7049_554d_4377b3a311e0
  style 4340bc1c_3ec7_7049_554d_4377b3a311e0 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

lib/validation.js lines 118–144

function validateParam (validatorFunction, request, paramName) {
  const isUndefined = request[paramName] === undefined
  let ret

  try {
    ret = validatorFunction?.(isUndefined ? null : request[paramName])
  } catch (err) {
    // If validator throws synchronously, ensure it propagates as an internal error
    err.statusCode = 500
    return err
  }

  if (ret && typeof ret.then === 'function') {
    return ret
      .then((res) => { return answer(res) })
      .catch(err => { return err }) // return as simple error (not throw)
  }

  return answer(ret)

  function answer (ret) {
    if (ret === false) return validatorFunction.errors
    if (ret && ret.error) return ret.error
    if (ret && ret.value) request[paramName] = ret.value
    return false
  }
}