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When you parse a document with the API or complete an ADE Parse Job, the parsed data is returned in a structured JSON format. The fields and structure of API responses are detailed in the API Reference. This article is designed to give additional context about the returned fields and how to use them.

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Response Structure

The response contains the following top-level fields:
FieldDescription
markdownComplete Markdown representation of the document.
chunksArray of chunk objects, one for each parsed region.
splitsArray of split objects organizing chunks by page or section.
groundingObject mapping chunk IDs to detailed grounding information, which includes the page number and bounding box coordinates.
metadataProcessing information (credit usage, duration, filename, job ID, page count, version). For partial content responses, includes a failed_pages array listing page numbers that failed to process.

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Chunk, Table, and Cell Identifiers

Each chunk, table, and table cell has a unique identifier (ID) that appears in multiple parts of the API response. Use these IDs to link different sets of information across the response. The ID format depends on the element type:
ID TypeFormatExample
Chunk IDsUUID format7d58c5cf-e4f5-4a7e-ba34-0cd7bc6a6506
Table IDs{page_number}-{base62_sequential_number}0-1
Table cell IDs{page_number}-{base62_sequential_number}0-2, 0-3

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Sequential Numbering for Tables and Cells

Table and cell IDs use sequential numbering within each page. The first table element on the first page has ID 0-1, and its first cell has ID 0-2. All subsequent table elements and cells on that page continue this sequential numbering (0-3, 0-4, etc.). The numbering restarts for each new page. For example, the first table on the second page will have ID 1-1, and its first cell will have ID 1-2.

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Parsed Chunks (chunks)

A chunk is a distinct region or element in the parsed document. The chunks array contains all parsed chunks from the document in reading order. Each chunk object in the chunks array contains:
FieldDescription
idChunk unique identifier (UUID format).
markdownMarkdown content for the chunk.
typeChunk type.
groundingThe location of the chunk in the document. Contains page number and bounding box coordinates.

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Splits

The split parameter is different from the API. If your goal is to separate a document into sub-documents after parsing, use the API, not the split parameter.
The splits array groups chunks into logical sections based on the split parameter. Each split object includes the chunks, markdown content, and page numbers for that section.
  • If the split parameter was omitted: The API returns the entire document as a single split.
  • If page-level splits were used (split=page): The API organizes chunks by page. For multi-page documents, this creates one split per page.

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Split Object Structure

Each split object contains:
FieldDescription
classThe split type.
  • full: Used when the split parameter was not included, and the array includes one entry for the entire document.
  • page: Used when the split parameter was included, and the array contains an entry for each page.
identifierThe unique identifier for each entry.
  • full: Used when the split parameter was not included, and the array includes one entry for the entire document.
  • page_{number}: Used when the split parameter was included. Includes the zero-indexed page number. Examples: page_0, page_1
pagesArray of page numbers (zero-indexed) included in the split.
markdownComplete markdown content for all chunks in the split.
chunksArray of chunk IDs included in the split.

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Full Document Split vs. Page-Level Split

When you omit the split parameter, the API returns a single split containing the entire document. When you set split=page, the API creates one split per page for multi-page documents. 
"splits": [
    {
        "class": "full",
        "identifier": "full",
        "pages": [0],
        "markdown": "...",
        "chunks": ["chunk-id-1", "chunk-id-2"]
    }
]

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Grounding Information (grounding)

Grounding is location information that maps each chunk or table cell back to its precise position in the original document. Each grounding entry includes the page number and bounding box coordinates for an element. The grounding object contains location data for all chunks and table cells in the parsed document.

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How the Grounding Object Works

The grounding object is a dictionary where chunk, table, and cell IDs are keys. To look up grounding information for any element, use its ID. What’s included in the grounding object:
  • All chunk IDs from the chunks array
  • Table IDs (for entire tables)
  • Table cell IDs (individual cells within tables)
Example: Consider parsing this document containing a table of bank account interest rates: Example document with bank account interest rates The parsed response is shown below, with key elements highlighted in the table:
LineDescriptionID
Line 47grounding object beginsN/A
Line 48Grounding for the text “Bank Account Rates”2831e56d-94f5-4ec4-b001-6e16e188119b
Line 58Grounding for the table chunk54905c88-b4b8-45a7-84b5-1dcf5f1d1e60
Line 68Grounding for the table ID0-1
Line 78Grounding for the first cell in the table, “Account Type”0-2
{
    "markdown": "<a id='2831e56d-94f5-4ec4-b001-6e16e188119b'></a>\n\n## Bank Account Rates\n\n<a id='54905c88-b4b8-45a7-84b5-1dcf5f1d1e60'></a>\n\n<table id=\"0-1\">\n<tr><td id=\"0-2\">Account Type</td><td id=\"0-3\">APY</td></tr>\n<tr><td id=\"0-4\">Checking</td><td id=\"0-5\">0.25%</td></tr>\n<tr><td id=\"0-6\">Savings</td><td id=\"0-7\">3.30%</td></tr>\n</table>",
    "chunks": [
        {
            "markdown": "<a id='2831e56d-94f5-4ec4-b001-6e16e188119b'></a>\n\n## Bank Account Rates",
            "type": "text",
            "id": "2831e56d-94f5-4ec4-b001-6e16e188119b",
            "grounding": {
                "box": {
                    "left": 0.01733572781085968,
                    "top": 0.03853631019592285,
                    "right": 0.46379542350769043,
                    "bottom": 0.212029367685318
                },
                "page": 0
            }
        },
        {
            "markdown": "<a id='54905c88-b4b8-45a7-84b5-1dcf5f1d1e60'></a>\n\n<table id=\"0-1\">\n<tr><td id=\"0-2\">Account Type</td><td id=\"0-3\">APY</td></tr>\n<tr><td id=\"0-4\">Checking</td><td id=\"0-5\">0.25%</td></tr>\n<tr><td id=\"0-6\">Savings</td><td id=\"0-7\">3.30%</td></tr>\n</table>",
            "type": "table",
            "id": "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60",
            "grounding": {
                "box": {
                    "left": 0.018494874238967896,
                    "top": 0.332082062959671,
                    "right": 0.9904391765594482,
                    "bottom": 0.9499841928482056
                },
                "page": 0
            }
        }
    ],
    "splits": [
        {
            "class": "full",
            "identifier": "full",
            "pages": [
                0
            ],
            "markdown": "<a id='2831e56d-94f5-4ec4-b001-6e16e188119b'></a>\n\n## Bank Account Rates\n\n<a id='54905c88-b4b8-45a7-84b5-1dcf5f1d1e60'></a>\n\n<table id=\"0-1\">\n<tr><td id=\"0-2\">Account Type</td><td id=\"0-3\">APY</td></tr>\n<tr><td id=\"0-4\">Checking</td><td id=\"0-5\">0.25%</td></tr>\n<tr><td id=\"0-6\">Savings</td><td id=\"0-7\">3.30%</td></tr>\n</table>",
            "chunks": [
                "2831e56d-94f5-4ec4-b001-6e16e188119b",
                "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60"
            ]
        }
    ],
    "grounding": {
        "2831e56d-94f5-4ec4-b001-6e16e188119b": {
            "box": {
                "left": 0.01733572781085968,
                "top": 0.03853631019592285,
                "right": 0.46379542350769043,
                "bottom": 0.212029367685318
            },
            "page": 0,
            "type": "chunkText"
        },
        "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60": {
            "box": {
                "left": 0.018494874238967896,
                "top": 0.332082062959671,
                "right": 0.9904391765594482,
                "bottom": 0.9499841928482056
            },
            "page": 0,
            "type": "chunkTable"
        },
        "0-1": {
            "box": {
                "left": 0.02559941303263648,
                "top": 0.34709447306434493,
                "right": 0.9833663842655778,
                "bottom": 0.9408472995763262
            },
            "page": 0,
            "type": "table"
        },
        "0-2": {
            "box": {
                "left": 0.025725066969341424,
                "top": 0.34709447306434493,
                "right": 0.5043980858495114,
                "bottom": 0.5451939275066816
            },
            "page": 0,
            "type": "tableCell",
            "position": {
                "row": 0,
                "col": 0,
                "rowspan": 1,
                "colspan": 1,
                "chunk_id": "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60"
            }
        },
        "0-3": {
            "box": {
                "left": 0.5043442644343732,
                "top": 0.3470990955792963,
                "right": 0.9832354042503647,
                "bottom": 0.5451945630018467
            },
            "page": 0,
            "type": "tableCell",
            "position": {
                "row": 0,
                "col": 1,
                "rowspan": 1,
                "colspan": 1,
                "chunk_id": "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60"
            }
        },
        "0-4": {
            "box": {
                "left": 0.025662229745978628,
                "top": 0.5451932923723879,
                "right": 0.5043442644343732,
                "bottom": 0.7430525865339257
            },
            "page": 0,
            "type": "tableCell",
            "position": {
                "row": 1,
                "col": 0,
                "rowspan": 1,
                "colspan": 1,
                "chunk_id": "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60"
            }
        },
        "0-5": {
            "box": {
                "left": 0.5042905263610684,
                "top": 0.5451939275066816,
                "right": 0.9833008650173567,
                "bottom": 0.7429820118984354
            },
            "page": 0,
            "type": "tableCell",
            "position": {
                "row": 1,
                "col": 1,
                "rowspan": 1,
                "colspan": 1,
                "chunk_id": "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60"
            }
        },
        "0-6": {
            "box": {
                "left": 0.02559941303263648,
                "top": 0.7429820118984354,
                "right": 0.5042905263610684,
                "bottom": 0.9408472995763262
            },
            "page": 0,
            "type": "tableCell",
            "position": {
                "row": 2,
                "col": 0,
                "rowspan": 1,
                "colspan": 1,
                "chunk_id": "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60"
            }
        },
        "0-7": {
            "box": {
                "left": 0.5042367730777779,
                "top": 0.7429113809301333,
                "right": 0.9833663842655779,
                "bottom": 0.9408260780878634
            },
            "page": 0,
            "type": "tableCell",
            "position": {
                "row": 2,
                "col": 1,
                "rowspan": 1,
                "colspan": 1,
                "chunk_id": "54905c88-b4b8-45a7-84b5-1dcf5f1d1e60"
            }
        }
    },
    "metadata": {
        "filename": "bank-account-rates.png",
        "org_id": null,
        "page_count": 1,
        "duration_ms": 2836,
        "credit_usage": 3.0,
        "job_id": "def6af5f0485497c81ea46bc4c848f83",
        "version": "dpt-2-20251103",
        "failed_pages": []
    }
}

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Fields in the Grounding Object

Each key-value pair in the grounding object uses an ID as the key (chunk ID, table ID, or cell ID) and location data as the value. Each value is an object with the following fields:
FieldDescription
boxBounding box coordinates
pageZero-indexed page number
typeDetailed classification. See grounding types.
confidenceConfidence score for text-based chunks. See Confidence Score.
low_confidence_spansSections of text with low confidence scores, if any.
positionFor table cells only. Cell location in table grid (row, col, spans). See Table Cell Position.
Example: Example of one key-value pair from the grounding object (logo chunk): 
{
  "grounding": {
    "49c7b7d0-2d8e-4485-8306-3dd820eb13ed": {
      "box": {
        "left": 0.06869561225175858,
        "top": 0.02685479447245598,
        "right": 0.1445186734199524,
        "bottom": 0.08676017820835114
      },
      "page": 0,
      "type": "chunkLogo"
    }
  }
}

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Grounding Types

Each entry in the grounding object has a type field that identifies the element type.

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Why are grounding types different from chunk types?

Most grounding types correspond directly to chunk types with a “chunk” prefix. However, the grounding object provides more granular location data than the chunks array. For tables, the grounding object includes separate entries for the HTML <table> element and individual cells, even though these are not separate chunks. This allows you to look up the precise location of any cell within a table. The following table lists the grounding types and the corresponding chunk types, when applicable.
Grounding TypeChunk Type
chunkAttestationattestation
chunkCardcard
chunkFigurefigure
chunkLogologo
chunkMarginaliamarginalia
chunkScanCodescan_code
chunkTabletable
chunkTexttext
tableSpecial grounding type representing the HTML <table> element within a table chunk.
tableCellSpecial grounding type representing an individual cell within a table.

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Table Grounding Structure

For each table in a document, the grounding object includes three types of entries: table chunk, table, cell. These three types form a hierarchy: the chunk entry provides the overall table location, while the table and cell entries provide precise locations for the HTML elements within that chunk.
EntryDescriptionType
ChunkThe table as a whole. Use when you need the overall table location.chunkTable
TableThe HTML <table> element. Use when you need the precise table boundaries.table
CellsEach individual cell. Use when you need to locate a specific cell.tableCell
Example: Consider parsing this simple 2-cell table: Example table with 2 cells The grounding field from the response is shown below, with key elements highlighted in the table:
LineDescriptionID
Line 1grounding objectN/A
Line 2Grounding for the table chunkef24b1ea-8dac-4a24-bf60-704b7c6a6bca
Line 12Grounding for the table ID0-1
Line 22Grounding for the first cell in the table, “Cell 1”0-2
Line 39Grounding for the second cell in the table, “Cell 2”0-3
"grounding": {
    "ef24b1ea-8dac-4a24-bf60-704b7c6a6bca": {
        "box": {
            "left": 0.15924638509750366,
            "top": 0.19857195019721985,
            "right": 0.6330658197402954,
            "bottom": 0.313611775636673
        },
        "page": 0,
        "type": "chunkTable"
    },
    "0-1": {
        "box": {
            "left": 0.16758577831817933,
            "top": 0.20629539815303133,
            "right": 0.6280869812016796,
            "bottom": 0.3090690124206503
        },
        "page": 0,
        "type": "table"
    },
    "0-2": {
        "box": {
            "left": 0.16758577831817933,
            "top": 0.2062988834957917,
            "right": 0.39743034595752635,
            "bottom": 0.3090588206865543
        },
        "page": 0,
        "type": "tableCell",
        "position": {
            "row": 0,
            "col": 0,
            "rowspan": 1,
            "colspan": 1,
            "chunk_id": "ef24b1ea-8dac-4a24-bf60-704b7c6a6bca"
        }
    },
    "0-3": {
        "box": {
            "left": 0.3972880070815534,
            "top": 0.20629539815303133,
            "right": 0.6280869812016795,
            "bottom": 0.3090690124206503
        },
        "page": 0,
        "type": "tableCell",
        "position": {
            "row": 0,
            "col": 1,
            "rowspan": 1,
            "colspan": 1,
            "chunk_id": "ef24b1ea-8dac-4a24-bf60-704b7c6a6bca"
        }
    }
},

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Table Cell Position Information

Each table cell (tableCell) includes a position field that provides the cell’s location in the table grid. The row and col values are zero-indexed, where row: 0, col: 0 represents the first row and first column of the table. The rowspan and colspan values indicate merged cells, with a value of 1 meaning the cell is not merged in that direction.
FieldDescription
rowRow position (integer, zero-indexed).
colColumn position (integer, zero-indexed).
rowspanNumber of rows the cell spans (integer).
colspanNumber of columns the cell spans (integer).
chunk_idAssociated chunk identifier (string).

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How to Use the Table Cell Positions

Use the table cell position information in the grounding to:
  • Map parsed data back to specific cells in the original table (for example, verify that a dollar amount came from row 2, column 3)
  • Identify merged cells through the rowspan and colspan values
  • Programmatically reference cells by their row and column indices

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Confidence Score

returns confidence scores for text, marginalia, card, and table chunks, as well as table cells, when parsing with . Confidence scores measure the confidence level of parsed text in Markdown with respect to the actual text or visual data present in the document. Each score ranges from 0.0 (low confidence) to 1.0 (high confidence). Lower values indicate regions where the model was less certain about the output. For example, here are the confidence score fields for a chunk:
Confidence score fields
"grounding": {
    "42ca60d3-a606-4c9a-a61e-493966b63fd9": {
      "box": {
        "left": 0.8607578277587891,
        "top": 0.9346558451652527,
        "right": 0.9316827058792114,
        "bottom": 0.951895534992218
      },
      "page": 0,
      "type": "chunkMarginalia",
      "confidence": 0.991,
      "low_confidence_spans": []
    }
}
The confidence score feature is in Preview. The numeric range and distribution may change as we continue to develop and improve the model.

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Confidence Score Fields

The grounding object includes the following confidence-related fields:
FieldDescription
confidenceOverall confidence score for the chunk or element (0.0 to 1.0). When low_confidence_spans contains entries, this is the lowest of the span-level or cell-level confidence scores.
low_confidence_spansArray of objects identifying specific text substrings with confidence scores of 0.95 or lower. Empty array if no low-confidence substrings exist. Learn more in Low Confidence Spans.

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Low Confidence Spans

The low_confidence_spans array contains substrings that have confidence scores of 0.95 or lower. Each object in the low_confidence_spans array contains:
FieldDescription
textThe substring that has low confidence.
spanTwo-element array [start, end] indicating the character position range of the substring within the chunk’s text. Positions are zero-indexed.
confidenceConfidence score for this specific substring (0.0 to 1.0).
For example, in the parse response below, the API has low confidence for two spans of text within the chunk.
Low confidence spans
"grounding": {
    "6be7d3cf-6664-42c7-906c-4957882e40ff": {
      "box": {
        "left": 0.24479518830776215,
        "top": 0.9269143342971802,
        "right": 0.6804859042167664,
        "bottom": 0.9461647272109985
      },
      "page": 0,
      "type": "chunkText",
      "confidence": 0.25,
      "low_confidence_spans": [
        {
          "text": " 1220",
          "span": [
            8,
            13
          ],
          "confidence": 0.25
        },
        {
          "text": "15?\"",
          "span": [
            26,
            30
          ],
          "confidence": 0.62
        }
      ]
    }
  }

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Chunks and Elements with Confidence Scores

Confidence scores are available for text, marginalia, card, and table chunks, as well as table cells. The tableCell elements have confidence scores but do not include low_confidence_spans
Grounding TypeChunk TypeHas Confidence ScoreHas Low Confidence Spans
chunkTexttext✓✓
chunkMarginaliamarginalia✓✓
chunkCardcard✓✓
chunkTabletable✓✓
table—✖✖
tableCell—✓✖
chunkFigurefigure✖✖
chunkLogologo✖✖
chunkAttestationattestation✖✖
chunkScanCodescan_code✖✖

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Confidence Score Availability

Confidence scores are only available when using the or ADE Parse Jobs API with .

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Null Confidence Scores

The confidence score will be null in the following situations: For example, here are the confidence score fields for a logo:
Response when confidence score not applicable
    "7215c238-8363-4de3-9f34-dd12c42cf5ec": {
      "box": {
        "left": 0.6948671936988831,
        "top": 0.9627023339271545,
        "right": 0.9369598031044006,
        "bottom": 1
      },
      "page": 0,
      "type": "chunkLogo",
      "confidence": null,
      "low_confidence_spans": []
    }

​
How to Use Confidence Scores

Confidence scores are not a calibrated probability of correctness. Use them as a ranking or triage signal to flag and prioritize content for human review, rather than as an exact measure of error likelihood.

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Factors That Can Lower Confidence Scores

Certain document characteristics may result in lower confidence scores:
  • Low-resolution or degraded scans
  • Handwritten text that is difficult to read
  • Superscripts and subscripts
  • Characters or punctuation that look alike, such as commas and periods
  • Words split across lines with a hyphen
  • Line endings where it’s unclear whether the text continues in the same paragraph or starts a new one

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False Positives

The system is designed to over-flag rather than risk missing potential issues. As a result, some regions may be marked as low confidence even when the parsed output is correct. These false positives mean you may need to review some content that is actually correct, but they help reduce the likelihood of missing content that contains errors.

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When to Use Chunk-Level vs. Global Grounding

Grounding information is available at the chunk level (chunks[].grounding) and at the global level (grounding). Each has a different level of detail:
FieldDescriptionGlobal Grounding ObjectChunk-Level Grounding
boxBounding box coordinates✓✓
pageZero-indexed page number✓✓
confidenceConfidence score✓✖
low_confidence_spansSections of text with low confidence scores, if any✓✖
typeDetailed element type✓✖
positionTable cell position✓✖
Choose the appropriate source based on your workflow: Use the global grounding object when:
  • You need table cell positions or other HTML element grounding
  • You need confidence scores
  • You need to understand relationships between elements
  • Building comprehensive document analysis workflows
  • You need the complete, authoritative grounding data for all elements in the document
Use chunk-level grounding (chunks[].grounding) when:
  • Iterating through chunks sequentially and need each chunk’s location immediately
  • Working with a single chunk in isolation
  • Building simple workflows where each chunk is processed independently

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Working with Bounding Box Coordinates

The grounding objects include the bounding box coordinates for each chunk in the box object:
FieldDescription
leftLeft edge position
topTop edge position
rightRight edge position
bottomBottom edge position

​
Bounding Box Values

All bounding box coordinates use normalized values between 0 and 1, where:
  • (0, 0) represents the top-left corner of the page
  • (1, 1) represents the bottom-right corner of the page

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Convert Bounding Box Values

To convert bounding box values to pixel coordinates, multiply the normalized values by the image dimensions: 
x1 = left * image_width
y1 = top * image_height
x2 = right * image_width
y2 = bottom * image_height
For practical examples of working with bounding box coordinates, go to Link Extracted Data to Document Locations.

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Example Response

The following is the API response when parsing this single-page Product Specifications Sheet. The document contains text, a logo, a table, a barcode, and more. The split parameter was omitted in the API call. 
{
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