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# meterJSON

[./index.js:104-224](https://github.com/ewasm/wasm-metering/blob/5ab76de89bc07d0abfaa6d0c776c204a752a0d9d/./index.js#L104-L224 "Source code on GitHub")

Injects metering into a JSON output of [wasm2json](https://github.com/ewasm/wasm-json-toolkit#wasm2json)

**Parameters**

-   `json` **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** the json tobe metered
-   `opts` **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** 
    -   `opts.costTable` **\[[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)]** the cost table to meter with. See these notes about the default. (optional, default `defaultTable`)
    -   `opts.moduleStr` **\[[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)]** the import string for the metering function (optional, default `'metering'`)
    -   `opts.fieldStr` **\[[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)]** the field string for the metering function (optional, default `'usegas'`)
    -   `opts.meterType` **\[[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)]** the regerster type that is used to meter. Can be `i64`, `i32`, `f64`, `f32` (optional, default `'i64'`)

Returns **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** the metered json

# meterWASM

[./index.js:236-240](https://github.com/ewasm/wasm-metering/blob/5ab76de89bc07d0abfaa6d0c776c204a752a0d9d/./index.js#L236-L240 "Source code on GitHub")

Injects metering into a webassembly binary

**Parameters**

-   `json` **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** the json tobe metered
-   `opts` **\[[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)](default {})** 
    -   `opts.costTable` **\[[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)]** the cost table to meter with. See these notes about the default. (optional, default `defaultTable`)
    -   `opts.moduleStr` **\[[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)]** the import string for the metering function (optional, default `'metering'`)
    -   `opts.fieldStr` **\[[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)]** the field string for the metering function (optional, default `'usegas'`)
    -   `opts.meterType` **\[[String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)]** the regerster type that is used to meter. Can be `i64`, `i32`, `f64`, `f32` (optional, default `'i64'`)
-   `wasm`  

Returns **[Buffer](https://nodejs.org/api/buffer.html)**