feat: add JSON and utility functions (fromJSON, toJSON, keys, values, len)#18
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feat: add JSON and utility functions (fromJSON, toJSON, keys, values, len)#18
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Add built-in functions matching Go expr functionality: - fromJSON(string): Parse JSON string into Value - toJSON(value): Serialize Value to JSON string - keys(map): Get array of map keys - values(map): Get array of map values - len(array|string|map): Get length of collection These functions are useful for working with JSON data in expressions, such as parsing HTTP backend responses for version lists. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Adds built-in functions matching Go expr functionality:
fromJSON(string)- Parse JSON string into ValuetoJSON(value)- Serialize Value to JSON stringkeys(map)- Get array of map keysvalues(map)- Get array of map valueslen(array|string|map)- Get length of collectionMotivation
These functions are needed for mise to work with HTTP backend responses. Currently mise has a local workaround implementing
fromJSONandkeysas custom functions:https://github.com/jdx/mise/blob/42d4a42b2ee2a2d31418f8dba98c1bdbffe31469/src/backend/version_list.rs#L58-L83
This was needed to fix HashiCorp tool version fetching which returns JSON responses that need to be parsed and have their keys extracted. Having these as built-in functions would be cleaner and benefit other users.
Reference: jdx/mise#7806
Changes
src/functions/json.rsmodule with JSON conversion helpersserde_jsonas a regular dependency (was only dev-dependency)Test plan
json_functionstest covers all new functions🤖 Generated with Claude Code
Note
Introduces JSON and collection helpers to the default function set.
src/functions/json.rswith converters betweenserde_json::ValueandValuefromJSON,toJSON,keys,values,lenand registers them inEnvironment::new()serde_jsonas a runtime dependencyWritten by Cursor Bugbot for commit 507ad9e. This will update automatically on new commits. Configure here.