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Should I Use Bundlephobia | Size of npm dependencies?

bundlephobia.com·Analyzed 18 hours ago··Based on 8 sources

Bundlephobia helps you find the performance impact of npm packages. Find the size of any javascript package and its effect on your frontend bundle.

Worth it

Worth it

Any frontend developer should keep Bundlephobia open — it is free and instantly answers what a dependency costs your bundle before you install it.

Free, instant npm package size checks. Use before every install; useless if you don't ship frontend JS.

Confidence: Medium

$0

Price

Free public web tool

Yes

Free tier

Entire tool is free

88/100

Trust score

Gridinsoft scan, no blacklist hits

2+ papers

Academic citations

2022 thesis and JS framework survey

Value for money5

Free; there is nothing to pay

Ease of use5

Paste package name, get size

Feature depth3

Single-purpose size lookup only

Security posture4

88/100 trust score, no blacklist detections

Pros

  • Free instant size check for any npm package¹
  • Named among '15 time-saving websites every developer needs'³
  • Cited in academic research on JS library performance⁴
  • Public API powers badges and benchmarks
  • Embedded in real company coding guidelines⁶

Cons

  • Package lookups only; won't audit your app's actual bundle¹
  • No security page published on the site
  • Browser-only; some devs built in-editor alternatives for speed⁵

Gotchas

  • mediumChecks packages in isolation; tree-shaking in your build may differ¹
  • lowNo pricing page or support channel listed — treat it as free-as-is, no SLA¹
  • lowSite publishes no security page, so transparency is limited

Best for

  • Frontend devs vetting npm packages pre-install
  • Teams fighting React bundle bloat
  • Library authors comparing package weight
  • Quick check-before-you-install habit

Not for

  • Backend/Node-only teams — no frontend bundle to weigh
  • Non-developers; it assumes you run npm installs
  • Teams needing CI-enforced bundle budgets
  • Anyone needing a full audit of their app's real bundle

Companies that use it

Pricing

Free

$0

  • Size any npm package
  • See frontend bundle impact

Security

No known public vulnerabilities found in the sources reviewed.

What users say

Developers and dev-content writers repeatedly recommend it as a pre-install habit; no substantive complaints surfaced in sources.

“Senior dev habit: Check bundle size before you install — not after production feels slow.”
— LinkedIn, Attila Vago
“Great work on this tool Shubham Kanodia!”
— LinkedIn, DebugBear
“В react-colorful я вообще собрал бенчмарк на основе бейджей, использующих API bundlephobia.com.”
— Thread Reader App, @jsunderhood

Alternatives

Compare Bundlephobia | Size of npm dependencies with each alternative.

Banal (VSCode extension)

Bundle inspection inside VSCode, no tab switching

Full analysis

Based on ~20 public sources; overwhelmingly recommendations and mentions, few critical reviews.

Sources

  1. Bundlephobia official sitebundlephobia.com
    official
  2. Bundlephobia.com Safety Review (88/100 Trust Score)gridinsoft.com
    security
  3. 15 Time-Saving Websites Every Developer Needsjavascript.plainenglish.io
    news
  4. Utility Library Performance Compared to Native Solutions (2022 thesis)diva-portal.org
    review
  5. Banal: on-demand bundle analyzer for VSCodegithub.com
    official
  6. COMET DXP coding guidelines referencing Bundlephobiadocs.comet-dxp.com
    official
  7. Senior dev habit post (LinkedIn)linkedin.com
    news
  8. Upcoming JavaScript web frameworks survey citing Bundlephobiaresearchgate.net
    review

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