How to Use the JSON Key Case Converter
The JSON Key Case Converter solves a naming-convention mismatch developers run into constantly: frontend code often uses camelCase while backend APIs and databases lean on snake_case, which means keys have to be renamed by hand every time data moves between the two.
Paste a JSON object in and this tool recursively walks every key — including keys nested inside arrays and objects — and converts them all to the case you choose. It supports camelCase, snake_case, PascalCase, and kebab-case, and it only ever touches key names; values are left exactly as they were.
Use it to turn a snake_case API response into camelCase that matches your frontend conventions, or to flip camelCase data back to snake_case before saving it to a server. Everything is processed locally in your browser, so it's safe to paste sensitive data without it ever leaving your machine.
Frequently Asked Questions
Yes, the tool recursively walks through arrays and nested objects so every key gets converted to the selected case.
No, only key names are converted — strings, numbers, and booleans stay exactly as they were.