@naturalcycles/js-lib/dist/string/json.util.js

Standard library for universal (browser + Node.js) javascript

import { JsonParseError } from '../error/error.util.js';
// const possibleJsonStartTokens = ['{', '[', '"']
const DETECT_JSON = /^\s*[{["\-\d]/;
/**
 * Attempts to parse object as JSON.
 * Returns original object if JSON parse failed (silently).
 */
export function _jsonParseIfPossible(obj, reviver) {
    // Optimization: only try to parse if it looks like JSON: starts with a json possible character
    if (typeof obj === 'string' && obj && DETECT_JSON.test(obj)) {
        try {
            return JSON.parse(obj, reviver);
        }
        catch { }
    }
    return obj;
}
/**
 * Convenience function that does JSON.parse, but doesn't throw on error,
 * instead - safely returns `undefined`.
 */
export function _jsonParseOrUndefined(obj, reviver) {
    // Optimization: only try to parse if it looks like JSON: starts with a json possible character
    if (typeof obj === 'string' && obj && DETECT_JSON.test(obj)) {
        try {
            return JSON.parse(obj, reviver);
        }
        catch { }
    }
}
/**
 * Same as JSON.parse, but throws JsonParseError:
 *
 * 1. It's message includes a piece of source text (truncated)
 * 2. It's data.text contains full source text
 */
export function _jsonParse(s, reviver) {
    try {
        return JSON.parse(s, reviver);
    }
    catch {
        throw new JsonParseError({
            text: s,
        });
    }
}