A simple tool that serves a limited subset of on-chain information as JSON output.
yarn run:json-serve --ws ws://localhost:9944 --port 8181
Then just doing a get on http://localhost:8181 should return something like
Error: Invalid query '?q=', expected '?q=<type>', one of 'bondedpercentage', 'totalbonded', 'totalcoins'
When passing a correctly formatted query, e.g. http://localhost:8181?q=totalcoins should return for the chain, e.g -
8168333.357737305935
If you are installing it globally -
$ yarn global add @polkadot/json-serve
$ polkadot-js-json-serve ...