Validate and build API payloads faster: JSON formatting, OpenAI request checks, JWT decoding, Base64, URL encoding and cURL command generation.
Validate JSON, format it for reading, or minify it for compact API payloads without sending data to an external API.
Open tool JWT JWT DecoderDecode JWT header and payload locally, inspect common claims, and catch expiration or audience mistakes without sending tokens to an API.
Open tool Base64 Base64 Encoder and DecoderEncode and decode Base64 text locally for API payloads, token debugging, config values and quick automation tasks.
Open tool URL URL Encoder and DecoderEncode and decode URL components, query strings and redirect parameters without sending data to an external service.
Open tool cURL cURL Command BuilderBuild readable cURL commands for API requests with method, headers, JSON body and safe auth placeholders.
Open toolAPI Tools FAQ
Do these API tools call external services?
No. They run locally in the browser or generate commands for your terminal.
Can I paste production secrets?
Avoid pasting real secrets into any browser page. Use placeholders when building commands and examples.
Where should I start debugging an API request?
Validate JSON first, then inspect headers, method, URL encoding and endpoint-specific parameters.