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https://mainichi.jp

Content

· 5 checks — Internal links, mixed-content guards, Open Graph previews, and structured data rolled into one auditable list.
SCORE
93
GRADE
A
FIX
0
REVIEW
2
PASS
3
INFO
0
Checks
5
3 PASS 2 REVIEW
B
Structured Data
1 JSON-LD block(s) found — some improvements recommended.
REVIEW
1 JSON-LD block(s) found — some improvements recommended.
Warning::
Missing or invalid @context in block #1
The @context should be "https://schema.org" for search engines to recognize the data.
Got: http://schema.org/ Expected: https://schema.org
Info::
Custom type "CollectionPage" — unable to validate specific properties
URL: http://schema.org/

The @context should be "https://schema.org" for search engines to recognize the data.

Expected: https://schema.org
Why this matters

JSON-LD without @context is invalid structured data — Google ignores the entire block.

Learn more ▾

@context must be 'https://schema.org' (or the schema-specific URL). Without it, the block isn't parseable as schema.org JSON-LD and Google skips it. Most schema generators handle this; manual edits sometimes drop the field.

Source: JSON-LD spec / schema.org

JSON-LD Blocks

Block 1 : CollectionPage
6 properties Valid
Missing or invalid @context
{
  "@context": "http://schema.org/",
  "@type": "CollectionPage",
  "headline": "ニュースサイト - 毎日新聞",
  "description": "毎日新聞デジタルは毎日新聞のニュースサイト。政治、経済、国際、事件、話題、スポーツなどの速報、写真、動画を掲載しています。",
  "url": "https://mainichi.jp",
  "hasPart": []
}
C
Brand Presence
Action
Site-name consistency, favicon, social image, meta tags, schema, and contact signals
REVIEW

Brand Presence

Your brand name differs across channels — visitors see inconsistent identity.

C

56/100

Site name appears as

Page title毎日新聞のニュースサイト
og:site_name毎日新聞
twitter:site@mainichi
Organization.name—

Inconsistent — names differ across channels

Brand assets

Favicon

12/15

covers apple-touch-icon

Social share image

14/20

og:image set; twitter:image missing

Meta completeness

20/20

Organization schema

0/15

Contact info discoverable

5/10

contact page

Findings

  • Brand name differs across channels — users see inconsistent identity
  • Add twitter:image — Twitter falls back to og:image only when it's larger than 300×157
  • Add an apple-touch-icon and at least two PNG sizes (32x32 + 192x192)
  • No Organization schema — Google can't render your logo in the knowledge panel
  • Only partial contact info discoverable — consider adding a dedicated contact page or mailto/tel link

How consistently your brand appears across channels — shared link previews, structured data, favicon, contact info.

A+
Mixed Content
No mixed content detected — all resources use HTTPS.
PASS
No mixed content detected — all resources use HTTPS.
Info::
No mixed content detected — all resources use HTTPS
A
Open Graph
Open Graph tags are well configured for social sharing.
PASS
Open Graph tags are well configured for social sharing.
Critical::
og:image is not reachable
The og:image URL could not be fetched. Social platforms won't be able to display it.
Got: https://cdn.mainichi.jp/vol1/2015/12/18/20151218hrc00m010001000q/9.jpg?2
Info::
og:title is short (23 characters)
Ideal length is 25–60 characters for social sharing previews.
Got: 23 chars Expected: 25–60 chars
URL: https://cdn.mainichi.jp/vol1/2015/12/18/20151218hrc00m010001000q/9.jpg?2

The og:image URL could not be fetched. Social platforms won't be able to display it.

Why this matters

An unreachable og:image URL (404, DNS fail, slow timeout) means social platforms cache the failure and serve no image for hours.

Learn more ▾

Social platforms (Facebook, Twitter) cache OG metadata aggressively — including failed image fetches. A momentarily-broken og:image can leave your shares imageless for hours. Test og:image URLs in Facebook's Sharing Debugger to force re-cache after fixing.

Source: Open Graph Protocol / Facebook Sharing Debugger

URL: 23 chars

Ideal length is 25–60 characters for social sharing previews.

Expected: 25–60 chars
Why this matters

og:title very short — may render with awkward whitespace in social cards.

Source: Open Graph Protocol

Preview

mainichi.jp

毎日新聞デジタル | 毎日新聞のニュースサイト

毎日新聞デジタルは毎日新聞のニュースサイト。政治、経済、国際、事件、話題、スポーツなどの速報、写真、動画を掲載しています。

Preview quality · Twitter/X A+ · 95/100
  • twitter:card — summary_large_image
  • twitter:title — ニュースサイト
  • twitter:description — 毎日新聞デジタルは毎日新聞のニュースサイト。政治、経済、国際、事件、話題、スポーツなどの速報、写真、動画を掲載しています。
  • twitter:image — falling back from og:image

MAINICHI.JP

毎日新聞デジタル | 毎日新聞のニュースサイト

毎日新聞デジタルは毎日新聞のニュースサイト。政治、経済、国際、事件、話題、スポーツなどの速報、写真、動画を掲載しています。

Preview quality · Facebook A · 90/100

Title will be truncated (63 chars / 60 max)

Description will be truncated (183 chars / 155 max)

  • og:title — 毎日新聞デジタル | 毎日新聞のニュースサイト
  • og:description — 毎日新聞デジタルは毎日新聞のニュースサイト。政治、経済、国際、事件、話題、スポーツなどの速報、写真、動画を掲載しています。
  • og:image — https://cdn.mainichi.jp/vol1/2015/12/18/20151218hrc00m010001000q/9.jpg?2
  • og:type — website
  • og:url — https://mainichi.jp
  • og:site_name — 毎日新聞

  • Title will be truncated on Facebook (63 chars, max 60)

    → Shorten og:title to ≤60 characters

  • Description will be truncated on Facebook (183 chars, max 155)

    → Tighten og:description to ≤155 characters

毎日新聞デジタル | 毎日新聞のニュースサイト

mainichi.jp

Preview quality · LinkedIn A+ · 95/100

Description will be truncated (183 chars / 150 max)

  • og:title — 毎日新聞デジタル | 毎日新聞のニュースサイト
  • og:description — 毎日新聞デジタルは毎日新聞のニュースサイト。政治、経済、国際、事件、話題、スポーツなどの速報、写真、動画を掲載しています。
  • og:image — https://cdn.mainichi.jp/vol1/2015/12/18/20151218hrc00m010001000q/9.jpg?2

  • Description will be truncated on LinkedIn (183 chars, max 150)

    → Tighten og:description to ≤150 characters

mainichi.jp

毎日新聞デジタル | 毎日新聞のニュースサイト

毎日新聞デジタルは毎日新聞のニュースサイト。政治、経済、国際、事件、話題、スポーツなどの速報、写真、動画を掲載しています。

Preview quality · Slack A+ · 100/100
  • og:title — 毎日新聞デジタル | 毎日新聞のニュースサイト
  • og:description — 毎日新聞デジタルは毎日新聞のニュースサイト。政治、経済、国際、事件、話題、スポーツなどの速報、写真、動画を掲載しています。
  • og:image — https://cdn.mainichi.jp/vol1/2015/12/18/20151218hrc00m010001000q/9.jpg?2

Social preview quality

Averaged across Twitter/X, Facebook, LinkedIn, and Slack.

A+ · 95/100
FieldTwitter/XFacebookLinkedInSlack
og:title
og:description
og:image
og:type
og:url
og:site_name
twitter:card———
twitter:title———
twitter:description———
twitter:image⚠———
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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