Format on save mode: modifications caused invalid formatting in JSON document

[vivektiwary]

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Issue Type: Bug

1. Paste any valid json with array of objects
2. Save it
3. Vscode will format { } with ({ })

VS Code version: Code 1.49.1 (58bb7b2, 2020-09-16T23:21:17.533Z)
OS version: Darwin x64 19.6.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz (16 x 2300)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	3, 4, 4
Memory (System)	16.00GB (0.32GB free)
Process Argv	-psn_0_6206955 --crash-reporter-id 6d76b1fb-143f-47b3-a162-06c182403bec
Screen Reader	no
VM	0%

Extensions (37)

Extension	Author (truncated)	Version
vscode-tomcat	ada	0.11.3
All-Autocomplete	Ati	0.0.23
code-gnu-global	aus	0.2.2
npm-intellisense	chr	1.3.1
path-intellisense	chr	2.3.0
vscode-eslint	dba	2.1.8
es7-react-js-snippets	dsz	3.0.0
gitlens	eam	10.2.2
vscode-html-css	ecm	0.2.3
prettier-vscode	esb	5.6.0
auto-close-tag	for	0.5.8
auto-rename-tag	for	0.1.4
go	gol	0.17.0
duplicateselection	kka	1.0.1
vscode-docker	ms-	1.6.0
python	ms-	2020.8.109390
cpptools	ms-	1.0.0
vscode-typescript-next	ms-	4.1.20200920
vscode-extension-auto-import	Nuc	1.4.3
vscode-boot-dev-pack	Piv	0.0.8
vscode-manifest-yaml	Piv	1.22.0
vscode-spring-boot	Piv	1.22.0
java	red	0.67.0
vscode-xml	red	0.13.0
vs-code-prettier-eslint	rve	0.3.2
jestRunIt	ves	0.4.0
vscodeintellicode	Vis	1.2.10
vscode-java-debug	vsc	0.28.0
vscode-java-dependency	vsc	0.13.0
vscode-java-pack	vsc	0.10.0
vscode-java-test	vsc	0.24.2
vscode-maven	vsc	0.24.2
vscode-spring-boot-dashboard	vsc	0.1.10
vscode-spring-initializr	vsc	0.5.0
vim	vsc	1.16.0
vscode-js-console-utils	wht	0.7.0
html-css-class-completion	Zig	1.19.0

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Format on Save Mode : Modifications causes invalid indentation (#107026)
• Format On Type doesn't work (#103756)
• reproduce (#105641)
• Read only mode? (#105485)

[aeschli]

Does this reproduce with extensions disabled?

[vivektiwary]

Hi @aeschli,
No it is not happening when i disable prettier. So it might be related to prettier.