Registry / serialization / prettier-plugin-expand-json

prettier-plugin-expand-json

library1.0.4jsnpmunverified

Prettier plugin that expands all JSON arrays and objects into multi-line format, ensuring consistent formatting for JSON and JSONC files. Current stable version 1.0.4, released with no dependencies. Engine requires Node >=20. Unlike default Prettier behavior which may collapse short objects, this plugin always forces multi-line output. Works with special files like package.json and composer.json, and can be combined with other JSON plugins (must be listed last).

serialization

npm install prettier-plugin-expand-json

github ↗package ↗

INSTALL

IMPORT

SIG · PRETTIER-PLUGIN-EX

prettier-plugin-expand-json

serializationjavascriptv1.0.4

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default

✓ in .prettierrc: { "plugins": ["prettier-plugin-expand-json"] }

✗ const plugin = require('prettier-plugin-expand-json')

Plugin is consumed via Prettier configuration, not imported directly in code.

Install plugin, configure Prettier, and format a JSON file to always expand arrays/objects to multi-line.

npm install --save-dev prettier prettier-plugin-expand-json echo '{"plugins":["prettier-plugin-expand-json"]}' > .prettierrc echo '{"a":1,"b":[2,3]}' > test.json npx prettier --write test.json cat test.json # Output: # { # "a": 1, # "b": [ # 2, # 3 # ] # }

Debug

Known issues

gotchaPlugin must be listed last in the plugins array when combined with other JSON plugins (e.g., prettier-plugin-sort-json, prettier-plugin-pkg). If not, other plugins may override the formatting.

fix

Ensure 'prettier-plugin-expand-json' is the last element in the 'plugins' array in your Prettier config.

affects: >=1.0.0

breakingMinimum Node engine is >=20. Using older Node versions will cause errors.

fix

Upgrade to Node 20 or later.

affects: >=1.0.0

gotchaPlugin does not provide any options; it forces expansion of all arrays and objects. If you need selective expansion, consider other tools.

fix

No workaround; designed to always expand.

affects: >=1.0.0

Errors

Common errors & fixes

Cannot find module 'prettier-plugin-expand-json'

Plugin not installed or not in node_modules, or Prettier cannot locate it.

fix

Run `npm install --save-dev prettier-plugin-expand-json` and ensure your working directory contains node_modules.

Error [ERR_REQUIRE_ESM]: require() of ES Module /path/to/prettier-plugin-expand-json/index.js from /path/to/prettier/index.js not supported.

Prettier is loading the plugin via require(), but the plugin is ESM-only (since v1). This happens if Prettier version is <3 (which used CJS).

fix

Upgrade Prettier to version 3 or later: `npm install --save-dev prettier@3`.

[error] prettier-plugin-expand-json: No parser found for file extension: .json

Prettier is not configured to use JSON parser for .json files, or another plugin overrides the parser.

fix

Ensure Prettier config includes `"plugins": ["prettier-plugin-expand-json"]` and that the plugin is listed last if multiple plugins are used.

Upgrade

Version history

1.0.4latest on npm

Audit

Dependencies

prettierrequiredpeer dependency, required to run as a plugin

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/porada/prettier-plugin-expand-json ↗

packagehttps://www.npmjs.com/package/prettier-plugin-expand-json ↗