JSON API Tools
From a JSON payload to a runnable curl command, a Postman collection, a HAR replay, or a fully-templated mock response — all in one place.
API workflows live in JSON. The tools here cover the round trip: turn JSON into the request format you need (curl, Postman, HAR), parse incoming requests back into JSON, and generate realistic mock responses for tests. Everything runs in your browser so tokens and payloads never leave your machine.
Tools in this collection
JSON to cURL Converter
Convert any JSON payload into a ready-to-run cURL command with proper headers and escaping. Free, browser-based.
cURL to JSON Parser
Paste a curl command and extract its JSON body, headers, URL, and method. Free, browser-based, no upload.
JSON to Postman Collection
Convert a list of API requests in JSON into a valid Postman v2.1 Collection. Free, browser-based.
JSON to HAR Converter
Convert a JSON list of HTTP requests/responses into a valid HAR 1.2 file for replay in DevTools. Free, browser-based.
JSON Mock API Response Builder
Build realistic JSON mock responses for unit tests, Storybook, and Mock Service Worker. Free, browser-based.