How does API payload size affect cloud bandwidth and egress costs?

Every byte returned by your API endpoints traverses cloud network providers. At scale, transmitting uncompressed or bloated JSON with redundant nulls, verbose timestamps, or repeated nested objects multiplies data transfer costs ($0.05 - $0.12 per GB) and increases client network latency.

What is the difference between Gzip, Brotli, Zstandard, MessagePack, and CBOR for API payloads?

Gzip is universally supported by web clients. Brotli provides 15-25% better compression for text/JSON. Zstandard (Zstd) offers near-Brotli ratios at much higher decompression speeds. MessagePack and CBOR are binary serialization formats that reduce payload size before compression by eliminating JSON string parsing overhead.

Is my API payload data uploaded or logged by BandwidthGuard?

No. BandwidthGuard runs 100% client-side inside your browser. No JSON payloads, headers, or API tokens are uploaded, tracked, or sent to any server.

How can I reduce my API response payload size?

You can reduce API response size by: 1) enabling Gzip or Brotli compression, 2) stripping null fields, 3) using Unix timestamps instead of ISO 8601 strings, 4) paginating lists to 20-50 items, 5) converting uniform object arrays to columnar arrays, 6) truncating floating point precision to 4 decimals, and 7) utilizing sparse fieldsets.

Runs 100% in your browser. Your payload never leaves your device.

Find What's Making Your API Payloads Too Big

Paste a JSON response, upload a HAR file, or analyze a request. See where the bytes are going, what you can optimize, and how much bandwidth you could save.

Payload Type:

{
  "page": 1,
  "total": 128,
  "results": [
    {
      "id": "usr_1000",
      "full_name": "Sample User 1",
      "email_address": "user1@example.com",
      "created_at": "2026-01-01T09:30:00.000Z",
      "updated_at": "2026-06-01T09:30:00.000Z",
      "avatar_url": null,
      "last_login_ip": null,
      "preferences": {
        "theme": "dark",
        "locale": "en-US",
        "newsletter": false
      }
    },
    {
      "id": "usr_1001",
      "full_name": "Sample User 2",
      "email_address": "user2@example.com",
      "created_at": "2026-01-02T09:30:00.000Z",
      "updated_at": "2026-06-02T09:30:00.000Z",
      "avatar_url": null,
      "last_login_ip": null,
      "preferences": {
        "theme": "dark",
        "locale": "en-US",
        "newsletter": false
      }
    },
    {
      "id": "usr_1002",
      "full_name": "Sample User 3",
      "email_address": "user3@example.com",
      "created_at": "2026-01-03T09:30:00.000Z",
      "updated_at": "2026-06-03T09:30:00.000Z",
      "avatar_url": null,
      "last_login_ip": null,
      "preferences": {
        "theme": "dark",
        "locale": "en-US",
        "newsletter": false
      }
    },
    {
      "id": "usr_1003",
      "full_name": "Sample User 4",
      "email_address": "user4@example.com",
      "created_at": "2026-01-04T09:30:00.000Z",
      "updated_at": "2026-06-04T09:30:00.000Z",
      "avatar_url": null,
      "last_login_ip": null,
      "preferences": {
        "theme": "dark",
        "locale": "en-US",
        "newsletter": false
      }
    },
    {
      "id": "usr_1004",
      "full_name": "Sample User 5",
      "email_address": "user5@example.com",
      "created_at": "2026-01-05T09:30:00.000Z",
      "updated_at": "2026-06-05T09:30:00.000Z",
      "avatar_url": null,
      "last_login_ip": null,
      "preferences": {
        "theme": "dark",
        "locale": "en-US",
        "newsletter": false
      }
    },
    {
      "id": "usr_1005",
      "full_name": "Sample User 6",
      "email_address": "user6@example.com",
      "created_at": "2026-01-06T09:30:00.000Z",
      "updated_at": "2026-06-06T09:30:00.000Z",
      "avatar_url": null,
      "last_login_ip": null,
      "preferences": {
        "theme": "dark",
        "locale": "en-US",
        "newsletter": false
      }
    },
    {
      "id": "usr_1006",
      "full_name": "Sample User 7",
      "email_address": "user7@example.com",
      "created_at": "2026-01-07T09:30:00.000Z",
      "updated_at": "2026-06-07T09:30:00.000Z",
      "avatar_url": null,
      "last_login_ip": null,
      "preferences": {
        "theme": "dark",
        "locale": "en-US",
        "newsletter": false
      }
    },
    {
      "id": "usr_1007",
      "full_name": "Sample User 8",
      "email_address": "user8@example.com",
      "created_at": "2026-01-08T09:30:00.000Z",
      "updated_at": "2026-06-08T09:30:00.000Z",
      "avatar_url": null,
      "last_login_ip": null,
      "preferences": {
        "theme": "dark",
        "locale": "en-US",
        "newsletter": false
      }
    }
  ]
}

Samples:

Formatting notice: Pretty-printed indentation adds +904 B vs minified (2.13 KB).

Bandwidth Score

52/ 100

Moderate Payload Bloat

Evaluates whitespace, redundant nulls, verbose keys, float precision, and array shapes.

Key Opportunity

~54.1%Potentially Removable(~1.63 KB)

Estimated · Review recommended

Based on detected payload patterns such as excess whitespace, default/null fields, verbose keys, and unconstrained float precision.

Original Payload3.01 KB3,082 bytes

Minified JSON2.13 KB−29.3% stripped

Optimized Target1.38 KB~54.1% potential savings

Detected Factors:Whitespace−904 BNull fields−312 BDefault values−144 BVerbose keys−306 B

Where Are Your Bytes Going?

Top JSON fields and nested paths consuming the most bandwidth

results70%results[*].preferences17%results[*].created_at10%results[*].updated_at10%results[*].email_address9%

results

70%

Count: ×12.10 KB

results[*].preferences

17%

Count: ×8528 B

results[*].created_at

10%

Count: ×8312 B

results[*].updated_at

10%

Count: ×8312 B

results[*].email_address

Count: ×8280 B

results[*].full_name

Count: ×8216 B

What Can I Fix?

Prioritized optimization actions: safe reductions vs contract revisions

Safe Optimizations

Zero contract risk — preserve exact client compatibility

Minify JSON

−904 B · 29.3%

Strip indentation and newlines. Same data — this is always applied when you copy.

Always Safe

Review With Frontend / Backend Team

Remove redundant nulls, defaults, and precision if clients accept omission

Keep PII off the list payload

−440 B · 14.3%

Looks like personal data: email_address, last_login_ip. Prefer a detail endpoint instead of repeating them on every row.

Notice: List screens rarely need email, IP, or phone. Only drop them if no client reads those keys.

Apply in rewrite

Remove null fields

−312 B · 10.1%

16 null values can be omitted entirely.

Notice: Clients may still read this key. Only drop it if the UI does not need to tell null apart from a missing field.

Apply in rewrite

Use Unix timestamps instead of ISO 8601

−166 B · 5.4%

16 ISO date strings shrink by roughly 40%.

Notice: Only convert if clients already parse numbers. Date pickers and OpenAPI schemas often require ISO strings.

Apply in rewrite

Omit false / 0 / empty-string defaults

−144 B · 4.7%

8 default values can be left off if missing means the same thing.

Notice: Clients often treat a missing key as false/0/"". Only drop defaults if the UI already does that.

Apply in rewrite

API Contract Changes

Alters payload schema, key names, or serialization format (requires client updates)

Convert repeated objects to columnar JSON

−714 B · 23.2%

results has 8 uniform items. Converting to {columns, rows} eliminates key repetition.

Notice: Columnar encoding replaces object keys on every row with a single header row and rows array. Client deserializers must support this.

Apply in rewrite

Don't repeat the same nested object on every row

−528 B · 17.1%

preferences ×8 is identical on each item. Lift it to a default or omit it on the list.

Notice: If every row has the same nested object, send it once or omit it on the list. Confirm the client can live without it per row.

Apply in rewrite

This list is already paged — slim each row

−308 B · 10.0%

Showing 8 of 128. Don't add more per-row fields; use a detail route for the rest.

Server/Serializer Change

Shorten repeated key names

−272 B · 8.8%

email_address → email, last_login_ip → ip, preferences → prefer. Rename in the serializer — not applied automatically.

Server/Serializer Change

Shorten repeated keys

−247 B · 8.0%

The same object shape repeats many times; key names dominate the payload. Rename in code — not applied automatically.

Server/Serializer Change

Approved rewrite: 0 B vs 3.01 KB original (Minify only · 0/6 contract changes ticked).

Gzip/Brotli applied by server/CDN

What Does This Payload Cost at Scale?

Simulate real-world traffic volume to project monthly egress bandwidth demands

Monthly Transfer Formula

50,000users×20req/day×3.01 KB≈86.11 GB/ month

Monthly active users50,000

10010,00010M

Requests per user per day20

150100

Compression on the wire

Architecture Scenarios

Current Transfer86.11 GB3.01 KB / req

Optimized Transfer60.27 GB~2.11 KB / req

Potential Reduction25.84 GBsaved / month

Total Requests: 30.00MEstimated Peak RPS: 23.1 req/s

Estimated Monthly Infrastructure Transfer Cost

Estimates for 86.11 GB monthly egress across major cloud providers

Region:

⚠️ Infrastructure Cost Disclaimer: Estimates are based on published public bandwidth transfer prices. Actual billing depends on multi-region routing, ingress/egress direction, CDN caching hit ratios, volume discounts, and commitment tiers.

⇄ Swipe horizontally to compare all providers & costs

Provider	Plan	Included	Egress cost	Request cost	Total monthly	Per 1M requests
Edge & CDN
Cloudflare CDNBest Value	CDN (Free / Pro / Biz zones)	Unmetered CDN egress	$0.00 $0.00 / GB	$0.00 $0.00	$0.00	$0.00
Azure CDN	Microsoft Standard	None	$6.97 $0.081 / GB	$0.00 included	$6.97	$0.23
GCP Cloud CDN	Cache egress	None	$6.89 $0.080 / GB	$22.50 $0.0075 / 10k	$29.39	$0.98
AWS CloudFront	Pay-as-you-go	1 TB / month (Always Free)	$0.00 $0.085 / GB	$30.00 $0.0100 / 10k	$30.00	$1.00
Fastly	Pay-as-you-go	$50 free trial credit	$10.33 $0.120 / GB	$22.50 $0.0075 / 10k	$32.83	$1.09
Frontend & Serverless Cloud
VercelBest Value	Pro	1 TB Fast Data Transfer	$0.00 $0.150 / GB	$0.00 not modeled	$0.00	$0.00
Netlify	Pro ($19/seat)	1 TB Bandwidth included	$0.00 $0.200 / GB	$0.00 included	$0.00	$0.00
Azure Static Web Apps	Standard	100 GB included / month	$0.00 $0.087 / GB	$0.00 included	$0.00	$0.00
Supabase	Pro ($25/mo)	250 GB unified egress	$0.00 $0.090 / GB	$0.00 included	$0.00	$0.00
Railway	Hobby / Pro	$5 free credit (~50 GB)	$3.61 $0.100 / GB	$0.00 included	$3.61	$0.12
Render	Pro workspace	25 GB included	$9.17 $0.150 / GB	$0.00 included	$9.17	$0.31
Backend Origin & VPS
AWS EC2 / BackendBest Value	Internet Egress	100 GB / month (Always Free)	$0.00 $0.090 / GB	$0.00 included	$0.00	$0.00
Azure VMs / Backend	Internet Egress	100 GB / month (Always Free)	$0.00 $0.087 / GB	$0.00 included	$0.00	$0.00
GCP Compute / Cloud Run	Internet Egress	100 GB / month (Always Free)	$0.00 $0.120 / GB	$0.00 included	$0.00	$0.00
DigitalOcean	Droplets ($6/mo)	1,000 GB included	$0.00 $0.010 / GB ($10/TB)	$0.00 included	$0.00	$0.00
Hetzner Cloud	Cloud CX	20 TB included (EU) / 1 TB (US)	$0.00 $0.001 / GB (€1/TB)	$0.00 included	$0.00	$0.00
Fly.io	Pay as you go	None (new orgs)	$1.72 $0.020 / GB	$0.00 included	$1.72	$0.06

Estimates, not invoices. List prices verified 2026-08-23 for US & Europe. Excludes compute, storage, seats, and enterprise discounts. CDN, serverless, and origin hosts are grouped separately as their architectures and pricing structures differ.

Cloudflare CDN · 2026-08-23
AWS CloudFront · 2026-08-23
Fastly · 2026-08-23
GCP Cloud CDN · 2026-08-23
Azure CDN · 2026-08-23
Vercel · 2026-08-23
Netlify · 2026-08-23
Azure Static Web Apps · 2026-08-23
Supabase · 2026-08-23
Railway · 2026-08-23
Render · 2026-08-23
AWS EC2 / Backend · 2026-08-23
Azure VMs / Backend · 2026-08-23
GCP Compute / Cloud Run · 2026-08-23
DigitalOcean · 2026-08-23
Hetzner Cloud · 2026-08-23
Fly.io · 2026-08-23

Compression & Serialization Benchmark

Live browser benchmarks distinguishing measured byte sizes from mathematical estimates

Raw JSON

Measured

Uncompressed original payload received or generated

3.01 KB

3,082 bytes on wire

Minified JSON

Measured

Whitespace stripped, valid standard JSON

2.13 KB−29%

2,178 bytes on wire

Gzip (Level 6)

Calculating…

Universal HTTP/1.1 & HTTP/2 compression supported by all clients

Calculating…

Computing stream size

Brotli (est.)

Calculating…

Modern web standard with higher compression ratio for text

Calculating…

Computing stream size

Zstandard (est.)

Calculating…

Modern high-performance compression; ideal when you control both client & server

Calculating…

Computing stream size

MessagePack

Calculating…

Compact binary JSON equivalent eliminating string parsing overhead

Calculating…

Computing stream size

CBOR

Calculating…

Concise Binary Object Representation standard (RFC 8949)

Calculating…

Computing stream size

What Happens on Real Networks?

Estimated download times for 3.01 KB on the wire, including TCP slow-start round trips

Slow 3G

Emerging markets / weak mobile signal (400 Kbps, 400ms RTT)

462 ms1 RTT

Transfer: 62msRTT: 400ms

Fast 3G

Typical 3G connection (1.6 Mbps, 150ms RTT)

165 ms1 RTT

Transfer: 15msRTT: 150ms

4G / LTE

Standard mobile LTE (12 Mbps, 50ms RTT)

52 ms1 RTT

Transfer: 2msRTT: 50ms

5G / Fiber

High-speed broadband or 5G (100 Mbps, 15ms RTT)

15 ms1 RTT

Transfer: 0msRTT: 15ms

Satellite / Starlink

Satellite link with propagation delay (25 Mbps, 220ms RTT)

221 ms1 RTT

Transfer: 1msRTT: 220ms

BandwidthGuard — Find API Payload Bloat

Find What's Making Your API Payloads Too Big

Where Are Your Bytes Going?

What Can I Fix?

Safe Optimizations

Review With Frontend / Backend Team

API Contract Changes

What Does This Payload Cost at Scale?

Estimated Monthly Infrastructure Transfer Cost

Compression & Serialization Benchmark

What Happens on Real Networks?

Detailed Technical Data & Diagnostics