sanitize json function

sanitize-json.ts

type JsonValue =
  | string
  | number
  | boolean
  | null
  | JsonValue[]
  | JsonObject

type JsonObject = { [key: string]: JsonValue }

/** Recursively removes values that can't be json serialized */
function sanitizeJson(value: unknown): JsonValue | undefined {
  if (
    typeof value === "string" ||
    typeof value === "number" ||
    typeof value === "boolean" ||
    value === null
  ) {
    return value
  }

  if (Array.isArray(value)) {
    return value.flatMap((v) => {
      const sanitized = sanitizeJson(v)
      return sanitized === undefined ? [] : [sanitized]
    })
  }

  if (typeof value === "object") {
    const result: JsonObject = {}
    for (const [k, v] of Object.entries(value)) {
      const sanitized = sanitizeJson(v)
      if (sanitized !== undefined) {
        result[k] = sanitized
      }
    }
    return result
  }

  return undefined
}