sidorares/node-mysql2

Regression on placeholders

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#4,126 opened on Feb 26, 2026

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Description

Replace from placeholder on 3.17+, return "[object, object]"

const mysql = require('mysql2'); const data = { id: 1 }; console.log(mysql.format('?', [data]));

Return to 3.16 solve the issue and returns "id = 1" 3.17+ returnss "[object, object]"

Contributor guide

Research direction
Compare the format function behavior between versions 3.16 and 3.17+ to identify the change that broke placeholder replacement for objects.
Tech stack
javascriptnodejs
Domain
backenddatabase
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Node.jsMySQL
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65