Three Naming Conventions Walked Into a Codebase and Broke the Build

Mei was cleaning up a legacy codebase. The API returned snake_case keys. The frontend expected camelCase. The design system used kebab-case for CSS variables. She spent an afternoon converting variable names by hand, copying and pasting, checking each one, and still missed three that broke the build.

The problem was not the conversion. The problem was that she was doing it one by one, in a text editor, without any consistency.

The pain, in four layers

Pain 1: inconsistent naming conventions multiply the work.
A single API field might appear as user_name in the database, userName in JavaScript, user-name in CSS, and User Name in the UI. Converting between these formats is not hard. Doing it forty times in a row is.

Pain 2: manual conversion is error-prone.
You convert order_total_amount to orderTotalAmount and miss the underscore. You convert shipping-address to shippingAddress and forget to capitalize the A. The code compiles. The bug shows up three days later in production.

Pain 3: most converters handle one format at a time.
You find a tool that does snake_case to camelCase. Then you need another tool for camelCase to kebab-case. Then another for Title Case. The friction is not the conversion. It is the tool switching.

Pain 4: online converters want your code.
You are converting internal API schemas, proprietary variable names, and client-specific identifiers. Pasting them into a free online tool means sending your codebase to a server you do not control. That is a security trade you should not have to make.

The tool

OnliTools Case Converter converts text between uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case, and more — directly in your browser. Paste your text, pick the format, and copy the result. No upload. No install. The text stays on your device.

How it works

1. Go to onlitools.com/case-converter.

1. Paste your text into the input field. A list of variable names works fine.

1. Select the target case format and copy the converted text.

1. Use the result in your project without sending anything to a server.

Why this matters

Mei now converts her variable names in batches. She pastes the list, selects the format, and copies the result. No missed underscores. No broken builds. No code leaving her machine.

If you are converting text case by hand, you are paying a tax on a task that should take seconds. This tool removes the tax.