This is what a complete results report would look like when each of the fields controlling the output is specified and PDF Checker completes the review successfully.

Note the section at the top of the results output, the CHECKER_SUMMARY.

This is a summary list of the items that PDF Checker found when reviewing a PDF document, intended to be machine readable.

You could set up a batch process to review a set of PDF documents stored in a server directory automatically, one by one. Then, you could add a step to your batch code that would identify the PDF documents that PDF CHECKER found with issues or problems, create an input JSON file listing those issues or problems, and send that JSON file list to PDF OPTIMIZER.  PDF OPTIMIZER could then optimize each PDF document based on the items found by PDF CHECKER.

PDF Checker 1.1.2  Copyright 2018 Datalogics, Inc. All Rights Reserved

Wed Sep 19 17:40:57 2018

JSON Profile: everything.json

Input Document: DocumentationExample.pdf

<<=CHECKER_SUMMARY_START=>>
userdata:contains-annots
userdata:contains-annots-not-for-printing
userdata:contains-annots-not-for-viewing
userdata:contains-embedded-files
userdata:contains-metadata
userdata:contains-transparency
fonts:uses-base14fonts-not-embedded
cleanup:suboptimal-compression
<<=CHECKER_SUMMARY_END=>>

General Results
    Errors:
        None
    Information:
        None
    Checks Completed:
        claims-pdfa-conformance
        contains-owner-password
        contains-signature
        damaged
        password-protected
        pdf-v2
        unable-to-open
        xfa-type

Userdata Results
    Errors:
        None
    Information:
        Contains annotations: 
            SubType: Circle (1 instance)
            SubType: FreeText (2 instances)
            SubType: Highlight (1 instance)
            SubType: Ink (1 instance)
            SubType: Line (2 instances)
            SubType: Polygon (2 instances)
            SubType: Popup (11 instances)
            SubType: Square (1 instance)
            SubType: Stamp (1 instance)
            SubType: StrikeOut (1 instance)
            SubType: Underline (1 instance)
        Contains annotations that are set as invisible for printing: 
            SubType: Popup (1 instance)
        Contains annotations that are set as invisible for viewing: 
            SubType: Square (1 instance)
        Contains embedded files: 
            Total: (1 instance)
        Contains metadata: 
            SubType: XML, Update region size: 2048 (1 instance)
        Contains transparency: 
            Total: (1 instance)
    Checks Completed:
        contains-annots
        contains-annots-not-for-printing
        contains-annots-not-for-viewing
        contains-annots-without-normal-appearances
        contains-embedded-files
        contains-metadata
        contains-optional-content
        contains-private-data
        contains-transparency

Fonts Results
    Errors:
        Uses Base 14 fonts not embedded in document: 
            Helvetica (1 instance)
            Helvetica-BoldOblique (1 instance)
    Information:
        None
    Checks Completed:
        fontdescriptor-missing-capheight
        fontdescriptor-missing-fields
        uses-base14fonts-not-embedded
        uses-fonts-fully-embedded
        uses-fonts-not-embedded

Objects Results
    Errors:
        None
    Information:
        None
    Checks Completed:
        contains-javascript-actions
        contains-thumbnails

Cleanup Results
    Errors:
        None
    Information:
        Contains conservatively compressed streams: 
            Uncompressed: (4 instances)
    Checks Completed:
        suboptimal-compression

Image Results
    Errors:
        None
    Information:
        None
    Checks Completed:
        alternate-images

    Color Images
    Errors:
        None
    Information:
        None
    Checks Completed:
        image-depth
        resolution-too-high
        resolution-too-low
        uses-jpeg2000-compression

    Grayscale Images
    Errors:
        None
    Information:
        None
    Checks Completed:
        resolution-too-high
        resolution-too-low
        uses-jpeg2000-compression

    Monochrome Images
    Errors:
        None
    Information:
        None
    Checks Completed:
        resolution-too-high
        resolution-too-low
        uses-jbig2-compression