Blog

Building real things, in public

Notes from DEMHA FUTURE — how we build apps fast with AI, and what we learn.

JSONPath Tester — free online tool

Test a JSONPath expression against your JSON and see what it matches, free and online, right in your browser with nothing uploaded.

JSON Schema Generator — free online

Paste sample JSON and get a matching JSON Schema in seconds, right in your browser. Free and online, nothing is uploaded.

JSON String Escape — free online tool

Turn any text into a valid JSON string, or unescape one back to plain text — free and online, right in your browser, nothing uploaded.

JSON to Code — free online converter

Turn any JSON into Go structs, Python and TypeScript types free and online, right in your browser, with nothing uploaded.

JSON to CSV Converter — free online

Turn a JSON array into a clean CSV file online and free, right in your browser, with nothing uploaded anywhere.

JSON to SQL converter — free online

Turn a JSON array into CREATE TABLE and INSERT statements free and online, right in your browser, with nothing uploaded.

JSON to TypeScript — free online tool

Paste JSON and get matching TypeScript interfaces in seconds, free and online — right in your browser, with nothing uploaded.

JSON Validator — free online checker

Check if your JSON is valid online and free, right in your browser. See the exact line, column and a plain hint for any error. Nothing uploaded.

JWT Decoder — free online tool

Decode a JWT to read its header, payload and expiry, free and online, right in your browser with nothing uploaded.

JWT Generator — free online tool

Build and sign a JWT, or paste a token to decode it — free and online, right in your browser with nothing uploaded.

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