# \#ledger-json-api

**URL:** https://forum.canton.network/tag/ledger-json-api/340.md

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## [Json Ledger API query with field filtering](https://forum.canton.network/t/json-ledger-api-query-with-field-filtering/8218)

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**Author:** [@David\_Martins](https://forum.canton.network/u/David_Martins)\
**Replies:** 3\
**Last updated:** [October 9, 2025, 2:33pm UTC](https://forum.canton.network/t/json-ledger-api-query-with-field-filtering/8218 "2025-10-09T14:33:09Z")

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Hello, I was attempting to execute a “/v2/state/active-contracts“ request but I’m not finding anything on the open api spec to filter by contract field, is this not possible?

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## [How to generate auth token to use the rest endpoint of the http-json](https://forum.canton.network/t/how-to-generate-auth-token-to-use-the-rest-endpoint-of-the-http-json/7882)

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**Author:** [@pratikkedia](https://forum.canton.network/u/pratikkedia)\
**Replies:** 0\
**Last updated:** [April 15, 2025, 5:05pm UTC](https://forum.canton.network/t/how-to-generate-auth-token-to-use-the-rest-endpoint-of-the-http-json/7882 "2025-04-15T17:05:47Z")

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Hi Team , I have setup running in eks cluster self hosted domain ,sequencer,participant and json all running as pods how can we generate auth token to use the rest endpoint of the http-json

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## [Use Postman for async endpoints on the Ledger JSON API](https://forum.canton.network/t/use-postman-for-async-endpoints-on-the-ledger-json-api/7611)

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**Author:** [@WallaceKelly](https://forum.canton.network/u/WallaceKelly)\
**Replies:** 1\
**Last updated:** [January 30, 2025, 8:36pm UTC](https://forum.canton.network/t/use-postman-for-async-endpoints-on-the-ledger-json-api/7611 "2025-01-30T20:36:22Z")

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Some of the endpoints on the Ledger JSON API are WebSocket endpoints. For example: /v2/state/active-contracts /v2/updates/flats /v2/updates/trees /v2/commands/completions I know how to call such endpoints with wscat. …