generateRandomString() — supabase Function Reference

Architecture documentation for the generateRandomString() function in JwtGenerator.tsx from the supabase codebase.

Function tsx DocumentationSystem ReferenceGen called by 1

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DocumentationSystem→ ReferenceGen→ generateRandomString() — supabase Function Reference

Dependency Diagram

graph TD
  5a090369_1c3c_5ea2_b963_0aa9c80c5013["generateRandomString()"]
  7bc1a88f_c0db_9a28_6231_dd969c041964["JwtGenerator()"]
  7bc1a88f_c0db_9a28_6231_dd969c041964 -->|calls| 5a090369_1c3c_5ea2_b963_0aa9c80c5013
  style 5a090369_1c3c_5ea2_b963_0aa9c80c5013 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

apps/docs/components/JwtGenerator/JwtGenerator.tsx lines 23–54

const generateRandomString = (length: number) => {
  const CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
  let result = ''

  /**
   * The number of possible Uint8 integers is 256. Since the length of `CHARS`
   * doesn't fit exactly into 256, simply taking the modulus would create an
   * uneven distribution that favors the earlier characters. To make a truly
   * uniform distribution, we have to discard everything above the last full
   * cycle, and pick again.
   *
   * The minus 1 is to account for 0-indexing.
   */
  const MAX = Math.floor(256 / CHARS.length) * CHARS.length - 1

  const randomUInt8Array = new Uint8Array(1)

  for (let i = 0; i < length; i++) {
    let randomNumber: number
    do {
      crypto.getRandomValues(randomUInt8Array)
      randomNumber = randomUInt8Array[0]
      /**
       * Keep picking until we get a number in the valid range.
       */
    } while (randomNumber > MAX)

    result += CHARS[randomNumber % CHARS.length]
  }

  return result
}