Replace numbers in exponential notation by numbers in fixed-point notation (or anything else) in a string of JSON.
MIT License
This module provides a function which takes a JSON string and replaces all numbers in exponential notation. By default, numbers in exponential notation are replaced by numbers in fixed-point notation. If an optional replacer function is provided, its return value is used instead.
The primary motivation for this module is to produce JSON for programs which handle exponential notation incorrectly (e.g. Azure/autorest#3006).
Using the CLI:
json-replace-exponentials <input-exponentials.json >output-fixed.json
Using the API:
const { readFile, writeFile } = require('fs').promises;
const jsonReplaceExponentials = require('json-replace-exponentials');
readFile('input-exponentials.json', { encoding: 'utf8' })
.then((json) => writeFile(
'output-fixed.json',
JSON.stringify(jsonReplaceExponentials(json), undefined, 2),
);
number
type.RangeError
for numbers where the exponentialjson-replace-exponentials
is undefined.This package can be installed using npm, either globally or locally, by running:
npm install json-replace-exponentials
As noted above, by default, exponents larger than 1,000 or -1,000 cause
RangeError
to be thrown. To replace with (non-standard) Infinity
and
Underflow
, and others with the default replacement:
const jsonReplaceExponentials = require('json-replace-exponentials');
function replacer(exponential) {
const match = /[eE]([+-]?)[0-9]{4,}$/.exec(exponential);
if (match) {
return match[1] === '-' ? 'Underflow' : 'Infinity';
}
return jsonReplaceExponentials(exponential);
}
jsonReplaceExponentials(json, replacer);
To use this module as a library, see the API Documentation.
Contributions are appreciated. Contributors agree to abide by the Contributor Covenant Code of Conduct. If this is your first time contributing to a Free and Open Source Software project, consider reading How to Contribute to Open Source in the Open Source Guides.
If the desired change is large, complex, backwards-incompatible, can have significantly differing implementations, or may not be in scope for this project, opening an issue before writing the code can avoid frustration and save a lot of time and effort.
This project is available under the terms of the MIT License. See the summary at TLDRLegal.