Developer tools
Small tools for the jobs that come up while wiring an API into something. Every one runs entirely in your browser — nothing is uploaded, there is no sign-up, and there is no limit on how often you use them.
cURL converter
Paste a cURL command and get the equivalent JavaScript fetch, axios, or Python requests code.
Open tool →JSON formatter
Format, validate and explore JSON. Get the exact line and column when it will not parse.
Open tool →CORS checker
Test whether an API can be called straight from browser JavaScript, or whether it needs a proxy.
Open tool →JWT decoder
Decode a JSON Web Token to read its header and claims, and see whether it has expired.
Open tool →These pair with the API directory: find an endpoint that needs no key, then test it here before writing any code.