Client ID and Client Secret Generator

Generate random OAuth client IDs and client secrets in your browser. Choose a prefix, secret length, and number of credentials.

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// about

About this Tool

This browser-based client credential generator creates random client IDs and secret codes locally. It is useful for development credentials and test integrations; store generated secrets in a secure secret manager.

How to use it

  1. Enter a client ID prefix, secret length, and number of credentials.
  2. Select Generate and review the generated client IDs and secrets.
  3. Copy the result and save it in a secure vault; cleared secrets cannot be recovered.

Why people use this tool

  • Generate multiple client credentials with a custom prefix in seconds.
  • Choose a secret length from 24 to 128 characters for stronger test credentials.
  • Credentials are generated in the browser and are not sent to this server.

Frequently Asked Questions

Are generated credentials saved?

No. Generation happens in your browser and the page does not save the output.

What is the maximum secret length?

You can choose a secret length from 24 through 128 characters.

Can I use these credentials in production?

Use them for development or testing. For production, follow your provider's credential policy and store secrets in a managed vault.

Guides · Security · 7 min read

How to Create a Strong Password: Length, Entropy and Password Managers

Rules like 'include one special character' are familiar, but what really makes a password strong is randomness and length. Doing the maths shows clearly why some passwords are weak.

Attackers use three main methods: credential stuffing, which replays user names and passwords leaked from other sites; dictionary attacks, which try common passwords and words; and brute force, which tries every combination.

6 digits                      : 6 × log2(10)  ≈ 20 bits
16 random lowercase letters   : 16 × log2(26) ≈ 75 bits
12 random chars from 94       : 12 × log2(94) ≈ 79 bits
16 random letters and digits  : 16 × log2(62) ≈ 95 bits
How to calculate password entropy, why length beats complexity rules, which patterns to avoid and how to use a password manager.
Read guide →

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UUID structure, how versions differ, why collisions are practically impossible, and why UUID v7 is overtaking v4 for database primary keys.

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Build it with AI

Build this tool yourself with AI

Want your own version of this tool? Copy the work-order prompt into an AI chat, or save the skill file for an AI coding agent. Both describe the features, edge cases and test cases we used when building it.

AI work-order prompt

Paste it as-is into an AI chat such as Claude, ChatGPT or Gemini.

You are an experienced full-stack web developer. Build a web tool called "Client Credential Generator" that meets the requirements below.

## Goal

Build a tool that securely generates client IDs and client secrets for API integrations.

## Core features

- Client IDs with a prefix (e.g. app_)
- Secrets with selectable length and character set
- Base64URL or hex output
- Preview as .env variables
- Copy each item

## Inputs

- Prefix, secret length in bytes, output format

## Outputs

- Client ID
- Client secret
- .env formatted text

## Edge cases and handling rules

- Recommend at least 32 bytes for secrets
- Never send or store generated values on a server
- Use only URL- and header-safe characters
- Warn that values disappear on refresh

## Implementation requirements

- Build it as a single page (HTML, CSS, JavaScript) that runs entirely in the browser, and never send the user's input to a server.
- Make the UI responsive and easy to use on mobile; label every input and keep everything keyboard accessible.
- Add a Copy button for results and show clear, friendly error messages for invalid input.
- Keep the core logic in functions separate from the UI so it can be unit-tested.

## Definition of done (test cases)

- A 32-byte Base64URL secret is 43 characters without padding
- Consecutive values differ
- IDs start with the chosen prefix

First outline your implementation plan in at most five lines, then write the complete code, and finally explain how to check the test cases above.

Skill (SKILL.md)

Save it as .claude/skills/build-client-credential-generator/SKILL.md for AI coding agents such as Claude Code to reuse whenever you build or change this tool.

---
name: build-client-credential-generator
description: Use when building or changing a Client Credential Generator tool. Build a tool that securely generates client IDs and client secrets for API integrations.
---

# Build: Client Credential Generator

## Goal

Build a tool that securely generates client IDs and client secrets for API integrations.

## Workflow

1. Review the required features, inputs and outputs below and ask about anything missing first.
2. Implement the core logic as pure functions separate from the UI.
3. Check the logic against the test cases in the verification list.
4. Build a responsive UI with an input form, a result area and a Copy button.
5. Reproduce each edge case listed under Rules and refine the error messages.

## Core features

- Client IDs with a prefix (e.g. app_)
- Secrets with selectable length and character set
- Base64URL or hex output
- Preview as .env variables
- Copy each item

## Inputs

- Prefix, secret length in bytes, output format

## Outputs

- Client ID
- Client secret
- .env formatted text

## Rules

- Recommend at least 32 bytes for secrets
- Never send or store generated values on a server
- Use only URL- and header-safe characters
- Warn that values disappear on refresh
- Build it as a single page (HTML, CSS, JavaScript) that runs entirely in the browser, and never send the user's input to a server.

## Verification

- [ ] A 32-byte Base64URL secret is 43 characters without padding
- [ ] Consecutive values differ
- [ ] IDs start with the chosen prefix

Tips for working with AI

  • Tell the AI your stack (for example React, Vue or plain HTML) on the first line so the code matches your project.
  • Ask it to run the listed test cases and show the results before you accept the code.
  • Never paste real secrets, customer data or API keys into the prompt; use sample values instead.