Diff text

Computes a deterministic line- or word-level diff and returns typed add/remove/equal parts. Use this when an agent needs structured change data. Split highly divergent large documents if the computation limit is reached. Limit: 200k combined characters, 2,000 result parts, 8 ms diff budget.

When to use it

Computes a deterministic line- or word-level diff and returns typed add/remove/equal parts. Use this when an agent needs structured change data. Split highly divergent large documents if the computation limit is reached.

Input schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "before": {
      "type": "string",
      "maxLength": 200000
    },
    "after": {
      "type": "string",
      "maxLength": 200000
    },
    "granularity": {
      "default": "lines",
      "type": "string",
      "enum": [
        "lines",
        "words"
      ]
    },
    "ignore_whitespace": {
      "default": false,
      "type": "boolean"
    }
  },
  "required": [
    "before",
    "after",
    "granularity",
    "ignore_whitespace"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "ok": {
      "const": true
    },
    "data": {
      "type": "object",
      "properties": {
        "equal": {
          "type": "boolean"
        },
        "granularity": {
          "enum": [
            "lines",
            "words"
          ]
        },
        "parts": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "operation": {
                "enum": [
                  "add",
                  "remove",
                  "equal"
                ]
              },
              "value": {
                "type": "string"
              },
              "count": {
                "type": "integer"
              }
            },
            "required": [
              "operation",
              "value",
              "count"
            ]
          }
        },
        "truncated": {
          "type": "boolean"
        },
        "before_chars": {
          "type": "integer"
        },
        "after_chars": {
          "type": "integer"
        }
      },
      "required": [
        "equal",
        "granularity",
        "parts",
        "truncated",
        "before_chars",
        "after_chars"
      ]
    },
    "meta": {
      "type": "object",
      "properties": {
        "request_id": {
          "type": "string"
        },
        "duration_ms": {
          "type": "integer"
        },
        "limits": {
          "type": "object"
        }
      },
      "required": [
        "request_id",
        "duration_ms"
      ]
    }
  },
  "required": [
    "ok",
    "data",
    "meta"
  ],
  "additionalProperties": false
}

REST example

curl -X POST https://plainport.exportitnow.workers.dev/api/v1/diff-text \
  -H "content-type: application/json" \
  -d '{"before":"alpha\nbeta","after":"alpha\ngamma"}'

Example result

{
  "ok": true,
  "data": {
    "equal": false,
    "granularity": "lines",
    "parts": [
      {
        "operation": "remove",
        "value": "beta",
        "count": 1
      },
      {
        "operation": "add",
        "value": "gamma",
        "count": 1
      }
    ]
  },
  "meta": {
    "request_id": "018f…",
    "duration_ms": 12
  }
}

Limit