---
product: Chilkat
product_version: 11.7.0
language: pascal
language_label: Lazarus Pascal
class: JsonArray
license: free
deprecated: false
reference_html: https://www.chilkatsoft.com/refdoc/pascal_JsonArrayRef.html
---
# Chilkat JsonArray — Lazarus Pascal — v11.7.0

> Chilkat 11.7.0 · language=pascal · class=JsonArray
> Other versions: replace `11.7.0` in this URL. Other languages: `https://www.chilkatsoft.com/ai-docs/v/11.7.0/<lang>/classes/JsonArray.md`.
> Language-wide rules (install, unlock, error model, strings/bytes): `https://www.chilkatsoft.com/ai-docs/v/11.7.0/pascal/guide.md`.

## Purpose

**Read, modify, search, and emit ordered JSON arrays.**

`Chilkat.JsonArray` is the JSON array companion to `Chilkat.JsonObject`. It represents an ordered list of JSON values and provides index-based methods for reading, inserting, replacing, deleting, swapping, searching, and emitting array data. It supports scalar values, nested objects, nested arrays, date/time parsing, exact numeric string handling, compact or pretty output, and search helpers for arrays of strings or arrays of objects.

**Ordered JSON values**

Work with JSON arrays as ordered lists containing strings, numbers, booleans, nulls, objects, arrays, and mixed value types.

**Index-based access**

Retrieve, insert, replace, delete, or swap values by array index when processing JSON list data.

**Nested objects and arrays**

Access child `JsonObject` and `JsonArray` values to navigate and modify deeper JSON structures.

**Search helpers**

Search arrays of strings or arrays of objects to locate matching values without manually scanning every element.

**Date and numeric handling**

Parse date/time values and preserve exact numeric strings when JSON data contains values that must not be rounded or reformatted.

**Emit JSON output**

Produce compact or pretty JSON output after array data has been loaded, edited, searched, or built programmatically.

**Common pattern:** Use `JsonObject` to navigate named members and JSON paths, then use `JsonArray` to iterate or modify ordered lists found within the object tree. Retrieve nested objects or arrays as needed, update values by index, and emit the final JSON in compact or pretty form.

For an extended overview, see [JsonArray Class Overview](https://www.chilkatsoft.com/jsonarray_class_overview.asp).

## Object creation, unlocking and error handling

**Create / Free**

```pascal
uses
  Chilkat.JsonArray;

var
  obj: TJsonArray;
begin
  obj := TJsonArray.Create;
  try
    if not obj.IsValid then
      raise Exception.Create('Failed to create a TJsonArray instance.');

    // ... use obj ...

  finally
    obj.Free;
  end;
end;
```

`constructor Create;`

Allocates the underlying CkJsonArray object and returns a new TJsonArray instance. Simply adding **Chilkat.JsonArray** to the unit's `uses` clause is enough to locate and bind to the Chilkat shared library (DLL / .so / .dylib) at runtime — no separate load step is required. Check `obj.IsValid` after calling `Create`; it is `False` if the underlying library could not be found/loaded or the object could not be allocated (for example, when unlicensed).

`destructor Destroy; override;`

Every TJsonArray created by calling `Create` should eventually be released by calling `.Free` (inherited from `TObject`). The destructor automatically disposes the underlying CkJsonArray handle. A native (unmanaged) memory leak occurs if the object is never freed.

Call `Global.UnlockBundle` once at the start of the program, before using this or any other Chilkat class. Any string unlocks a fully functional 30-day trial; a purchased unlock code is used in production. See `guide.md` for the exact code in Lazarus Pascal.

## Members common to every Chilkat class

Documented once per language in `common-members.md`; listed here so this page is self-contained.

| Property | Signature | Access | Meaning |
|---|---|---|---|
| `DebugLogFilePath` | `property DebugLogFilePath: string read GetDebugLogFilePath write SetDebugLogFilePath;` | read/write | If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. |
| `LastErrorHtml` | `property LastErrorHtml: string read GetLastErrorHtml;` | read-only | Provides HTML-formatted information about the last called method or property. |
| `LastErrorText` | `property LastErrorText: string read GetLastErrorText;` | read-only | Provides plain text information about the last called method or property. |
| `LastErrorXml` | `property LastErrorXml: string read GetLastErrorXml;` | read-only | Provides XML-formatted information about the last called method or property. |
| `LastMethodSuccess` | `property LastMethodSuccess: Boolean read GetLastMethodSuccess write SetLastMethodSuccess;` | read/write | Indicates the success or failure of the most recent method call: `True` means success, `False` means failure. |
| `VerboseLogging` | `property VerboseLogging: Boolean read GetVerboseLogging write SetVerboseLogging;` | read/write | If set to `True`, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. |
| `Version` | `property Version: string read GetVersion;` | read-only | Version of the component/library, such as "10.1.0" |

## Member index

| Member | Kind | Signature |
|---|---|---|
| `EmitCompact` | property, read/write | `property EmitCompact: Boolean read GetEmitCompact write SetEmitCompact;` |
| `EmitCrlf` | property, read/write | `property EmitCrlf: Boolean read GetEmitCrlf write SetEmitCrlf;` |
| `FindStartIndex` | property, read/write | `property FindStartIndex: Integer read GetFindStartIndex write SetFindStartIndex;` |
| `Size` | property, read-only | `property Size: Integer read GetSize;` |
| `AddArrayAt` | method | `function AddArrayAt(index: Integer): Boolean;` |
| `AddArrayAt2` | method | `// jarr is a TJsonArray object. function AddArrayAt2(index: Integer;     jarr: TChilkatBase): Boolean;` |
| `AddBoolAt` | method | `function AddBoolAt(index: Integer;     value: Boolean): Boolean;` |
| `AddIntAt` | method | `function AddIntAt(index: Integer;     value: Integer): Boolean;` |
| `AddNullAt` | method | `function AddNullAt(index: Integer): Boolean;` |
| `AddNumberAt` | method | `function AddNumberAt(index: Integer;     const numericStr: string): Boolean;` |
| `AddObjectAt` | method | `function AddObjectAt(index: Integer): Boolean;` |
| `AddObjectAt2` | method | `// json is a TJsonObject object. function AddObjectAt2(index: Integer;     json: TChilkatBase): Boolean;` |
| `AddObjectCopyAt` | method | `// jsonObj is a TJsonObject object. function AddObjectCopyAt(index: Integer;     jsonObj: TChilkatBase): Boolean;` |
| `AddStringAt` | method | `function AddStringAt(index: Integer;     const value: string): Boolean;` |
| `AddUIntAt` | method | `function AddUIntAt(index: Integer;     value: LongWord): Boolean;` |
| `AppendArrayItems` | method | `// jarr is a TJsonArray object. function AppendArrayItems(jarr: TChilkatBase): Boolean;` |
| `ArrayAt` | method | `// Return value is a TJsonArray object. function ArrayAt(index: Integer): TChilkatBase;` |
| `ArrayAt2` | method | `// jarr is a TJsonArray object. function ArrayAt2(index: Integer;     jarr: TChilkatBase): Boolean;` |
| `BoolAt` | method | `function BoolAt(index: Integer): Boolean;` |
| `Clear` | method | `procedure Clear;` |
| `DateAt` | method | `// dt is a TCkDateTime object. function DateAt(index: Integer;     dt: TChilkatBase): Boolean;` |
| `DeleteAt` | method | `function DeleteAt(index: Integer): Boolean;` |
| `DtAt` | method | `// dt is a TDtObj object. function DtAt(index: Integer;     bLocal: Boolean;     dt: TChilkatBase): Boolean;` |
| `Emit` | method | `function Emit: string;` |
| `EmitSb` | method | `// sb is a TStringBuilder object. function EmitSb(sb: TChilkatBase): Boolean;` |
| `FindObject` | method | `function FindObject(const name: string;     const value: string;     caseSensitive: Boolean): Integer;` |
| `FindString` | method | `function FindString(const value: string;     caseSensitive: Boolean): Integer;` |
| `IntAt` | method | `function IntAt(index: Integer): Integer;` |
| `IsNullAt` | method | `function IsNullAt(index: Integer): Boolean;` |
| `Load` | method | `function Load(const jsonArray: string): Boolean;` |
| `LoadSb` | method | `// sb is a TStringBuilder object. function LoadSb(sb: TChilkatBase): Boolean;` |
| `ObjectAt` | method | `// Return value is a TJsonObject object. function ObjectAt(index: Integer): TChilkatBase;` |
| `ObjectAt2` | method | `// jsonObj is a TJsonObject object. function ObjectAt2(index: Integer;     jsonObj: TChilkatBase): Boolean;` |
| `SetBoolAt` | method | `function SetBoolAt(index: Integer;     value: Boolean): Boolean;` |
| `SetIntAt` | method | `function SetIntAt(index: Integer;     value: Integer): Boolean;` |
| `SetNullAt` | method | `function SetNullAt(index: Integer): Boolean;` |
| `SetNumberAt` | method | `function SetNumberAt(index: Integer;     const value: string): Boolean;` |
| `SetStringAt` | method | `function SetStringAt(index: Integer;     const value: string): Boolean;` |
| `SetUIntAt` | method | `function SetUIntAt(index: Integer;     value: LongWord): Boolean;` |
| `StringAt` | method | `function StringAt(index: Integer): string;` |
| `Swap` | method | `function Swap(index1: Integer;     index2: Integer): Boolean;` |
| `TypeAt` | method | `function TypeAt(index: Integer): Integer;` |
| `UIntAt` | method | `function UIntAt(index: Integer): LongWord;` |

## Properties

### JsonArray.EmitCompact

`Chilkat 11.7.0 · pascal · JsonArray · EmitCompact · property · read/write · since 9.5.0.64`

```pascal
property EmitCompact: Boolean read GetEmitCompact write SetEmitCompact;
```

Controls whether emitted JSON is compact or pretty-formatted. If `True`, output contains no unnecessary whitespace and is emitted on a single line. If `False`, indentation and line breaks are added for readability. The default is `True`.

### JsonArray.EmitCrlf

`Chilkat 11.7.0 · pascal · JsonArray · EmitCrlf · property · read/write · since 9.5.0.64`

```pascal
property EmitCrlf: Boolean read GetEmitCrlf write SetEmitCrlf;
```

Controls line endings when pretty-formatted JSON is emitted. If `True`, line breaks use CRLF (); if `False`, they use LF (). The default is `True`.

**Applies only to pretty output:** When `EmitCompact` is `True`, the JSON is emitted on one line and this setting has no effect.

### JsonArray.FindStartIndex

`Chilkat 11.7.0 · pascal · JsonArray · FindStartIndex · property · read/write · since 11.6.0`

```pascal
property FindStartIndex: Integer read GetFindStartIndex write SetFindStartIndex;
```

Specifies the zero-based array index at which `FindString` and `FindObject` begin searching. The default value is `0`.

**Iterating matches:** After finding a match at index `n`, set this property to `n + 1` before the next search to continue with later elements.

### JsonArray.Size

`Chilkat 11.7.0 · pascal · JsonArray · Size · property · read-only · since 9.5.0.56`

```pascal
property Size: Integer read GetSize;
```

Returns the number of values currently contained in the JSON array. Array indexes therefore range from `0` through `Size - 1`.

## Methods

### JsonArray.AddArrayAt

`Chilkat 11.7.0 · pascal · JsonArray · AddArrayAt · method · since 9.5.0.56`

```pascal
function  AddArrayAt(index: Integer): Boolean;
```

Inserts a new, empty JSON array at zero-based position `index`. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Insert vs. replace:** The `Add*At` methods insert a new array element. Use the corresponding `Set*At` method when replacing an existing element.

Returns True for success, False for failure.

### JsonArray.AddArrayAt2

`Chilkat 11.7.0 · pascal · JsonArray · AddArrayAt2 · method · since 11.1.0`

```pascal
// jarr is a TJsonArray object.

function  AddArrayAt2(index: Integer;
    jarr: TChilkatBase): Boolean;
```

Inserts a new, empty JSON array at zero-based position `index` and updates `jarr` to reference the newly inserted array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Immediate editing:** Because `jarr` references the inserted array, it can be populated directly without a separate `ArrayAt` lookup.

Returns True for success, False for failure.

### JsonArray.AddBoolAt

`Chilkat 11.7.0 · pascal · JsonArray · AddBoolAt · method · since 9.5.0.56`

```pascal
function  AddBoolAt(index: Integer;
    value: Boolean): Boolean;
```

Inserts a new JSON boolean value at zero-based position `index`. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Insert vs. replace:** The `Add*At` methods insert a new array element. Use the corresponding `Set*At` method when replacing an existing element.

Returns True for success, False for failure.

### JsonArray.AddIntAt

`Chilkat 11.7.0 · pascal · JsonArray · AddIntAt · method · since 9.5.0.56`

```pascal
function  AddIntAt(index: Integer;
    value: Integer): Boolean;
```

Inserts a new JSON integer value at zero-based position `index`. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Insert vs. replace:** The `Add*At` methods insert a new array element. Use the corresponding `Set*At` method when replacing an existing element.

Returns True for success, False for failure.

### JsonArray.AddNullAt

`Chilkat 11.7.0 · pascal · JsonArray · AddNullAt · method · since 9.5.0.56`

```pascal
function  AddNullAt(index: Integer): Boolean;
```

Inserts a JSON `null` value at zero-based position `index`. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Insert vs. replace:** The `Add*At` methods insert a new array element. Use the corresponding `Set*At` method when replacing an existing element.

Returns True for success, False for failure.

### JsonArray.AddNumberAt

`Chilkat 11.7.0 · pascal · JsonArray · AddNumberAt · method · since 9.5.0.56`

```pascal
function  AddNumberAt(index: Integer;
    const numericStr: string): Boolean;
```

Inserts a JSON number at zero-based position `index`. The `numericStr` argument supplies the exact JSON numeric text to store. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Exact numeric text:** Use this method when lexical form or precision matters, for example `12345678901234567890`, `1.2500`, or scientific notation. The supplied text must be valid JSON number syntax; JSON does not permit `NaN` or infinity.

Returns True for success, False for failure.

### JsonArray.AddObjectAt

`Chilkat 11.7.0 · pascal · JsonArray · AddObjectAt · method · since 9.5.0.56`

```pascal
function  AddObjectAt(index: Integer): Boolean;
```

Inserts a new, empty JSON object at zero-based position `index`. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Insert vs. replace:** The `Add*At` methods insert a new array element. Use the corresponding `Set*At` method when replacing an existing element.

Returns True for success, False for failure.

### JsonArray.AddObjectAt2

`Chilkat 11.7.0 · pascal · JsonArray · AddObjectAt2 · method · since 11.1.0`

```pascal
// json is a TJsonObject object.

function  AddObjectAt2(index: Integer;
    json: TChilkatBase): Boolean;
```

Inserts a new, empty JSON object at zero-based position `index` and updates `json` to reference the newly inserted object.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Immediate editing:** Because `json` references the inserted object, it can be populated directly without a separate `ObjectAt` lookup.

Returns True for success, False for failure.

### JsonArray.AddObjectCopyAt

`Chilkat 11.7.0 · pascal · JsonArray · AddObjectCopyAt · method · since 9.5.0.82`

```pascal
// jsonObj is a TJsonObject object.

function  AddObjectCopyAt(index: Integer;
    jsonObj: TChilkatBase): Boolean;
```

Inserts an independent copy of `jsonObj` at zero-based position `index`. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Copy semantics:** The inserted object is copied rather than referenced. Later changes to the source `jsonObj` do not serve as edits to the inserted array value.

Returns True for success, False for failure.

### JsonArray.AddStringAt

`Chilkat 11.7.0 · pascal · JsonArray · AddStringAt · method · since 9.5.0.56`

```pascal
function  AddStringAt(index: Integer;
    const value: string): Boolean;
```

Inserts a new JSON string value at zero-based position `index`. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Insert vs. replace:** The `Add*At` methods insert a new array element. Use the corresponding `Set*At` method when replacing an existing element.

Returns True for success, False for failure.

### JsonArray.AddUIntAt

`Chilkat 11.7.0 · pascal · JsonArray · AddUIntAt · method · since 9.5.0.96`

```pascal
function  AddUIntAt(index: Integer;
    value: LongWord): Boolean;
```

Inserts a new JSON unsigned integer value at zero-based position `index`. Existing elements at that position and after it are shifted one position toward the end of the array.

|  |  |
| --- | --- |
| `0` | Insert as the first array element. |
| `-1` | Append as the last array element. |
| `n` | Insert at zero-based position n. |

**Insert vs. replace:** The `Add*At` methods insert a new array element. Use the corresponding `Set*At` method when replacing an existing element.

Returns True for success, False for failure.

### JsonArray.AppendArrayItems

`Chilkat 11.7.0 · pascal · JsonArray · AppendArrayItems · method · since 9.5.0.82`

```pascal
// jarr is a TJsonArray object.

function  AppendArrayItems(jarr: TChilkatBase): Boolean;
```

Appends copies of all values from `jarr` to the end of this array, preserving their order.

**Source is unchanged:** The source array is not emptied or moved. This method is useful for concatenating JSON arrays, including arrays belonging to different JSON documents.

Returns True for success, False for failure.

### JsonArray.ArrayAt

`Chilkat 11.7.0 · pascal · JsonArray · ArrayAt · method · since 9.5.0.56`

```pascal
// Return value is a TJsonArray object.

function  ArrayAt(index: Integer): TChilkatBase;
```

Returns the nested JSON array stored at zero-based position `index`.

**Reference, not copy:** The returned `JsonArray` refers to the existing nested array in the same JSON document. Changes made through the returned object modify that nested array.

**Type requirement:** The value at `index` must be an array. Use `TypeAt` when the value type is not already known.

Returns `nil` on failure

### JsonArray.ArrayAt2

`Chilkat 11.7.0 · pascal · JsonArray · ArrayAt2 · method · since 11.0.0`

```pascal
// jarr is a TJsonArray object.

function  ArrayAt2(index: Integer;
    jarr: TChilkatBase): Boolean;
```

Updates `jarr` so that it references the nested JSON array stored at zero-based position `index`.

**Reference, not copy:** Changes made through `jarr` modify the existing nested array in the same JSON document.

Returns True for success, False for failure.

### JsonArray.BoolAt

`Chilkat 11.7.0 · pascal · JsonArray · BoolAt · method · since 9.5.0.56`

```pascal
function  BoolAt(index: Integer): Boolean;
```

Returns the boolean value stored at zero-based position `index`.

**Type-aware access:** Use `TypeAt` when the JSON type at `index` is not already known.

### JsonArray.Clear

`Chilkat 11.7.0 · pascal · JsonArray · Clear · method · since 9.5.0.76`

```pascal
procedure Clear;
```

Removes all values from the array, leaving an empty JSON array (`[]`).

### JsonArray.DateAt

`Chilkat 11.7.0 · pascal · JsonArray · DateAt · method · since 9.5.0.73`

```pascal
// dt is a TCkDateTime object.

function  DateAt(index: Integer;
    dt: TChilkatBase): Boolean;
```

Parses the date/time value at zero-based position `index` and loads the result into `dt`. Recognized forms include ISO 8601 timestamps (for example, `2009-11-04T19:55:41Z`), RFC 822-style date/time strings, and Unix timestamp integers.

**JSON has no native date type:** Dates are application conventions represented as strings or numbers. These methods recognize common representations and convert them to Chilkat date/time objects.

Returns True for success, False for failure.

### JsonArray.DeleteAt

`Chilkat 11.7.0 · pascal · JsonArray · DeleteAt · method · since 9.5.0.56`

```pascal
function  DeleteAt(index: Integer): Boolean;
```

Deletes the value at zero-based position `index`. Elements following the deleted value shift down by one position.

Returns True for success, False for failure.

### JsonArray.DtAt

`Chilkat 11.7.0 · pascal · JsonArray · DtAt · method · since 9.5.0.73`

```pascal
// dt is a TDtObj object.

function  DtAt(index: Integer;
    bLocal: Boolean;
    dt: TChilkatBase): Boolean;
```

Parses the date/time value at zero-based position `index` and loads the result into `dt`. If `bLocal` is `True`, the populated fields represent local time; if `False`, they represent UTC/GMT. Recognized forms include ISO 8601 timestamps, RFC 822-style date/time strings, and Unix timestamp integers.

**JSON has no native date type:** Dates are application conventions represented as strings or numbers. These methods recognize common representations and convert them to Chilkat date/time objects.

Returns True for success, False for failure.

### JsonArray.Emit

`Chilkat 11.7.0 · pascal · JsonArray · Emit · method · since 9.5.0.58`

```pascal
function  Emit: string;
```

Serializes this JSON array and returns the resulting JSON text.

**Formatting:** Set `EmitCompact` to choose compact versus pretty output. When pretty output is enabled, `EmitCrlf` selects CRLF or LF line endings.

Returns True for success, False for failure.

### JsonArray.EmitSb

`Chilkat 11.7.0 · pascal · JsonArray · EmitSb · method · since 9.5.0.65`

```pascal
// sb is a TStringBuilder object.

function  EmitSb(sb: TChilkatBase): Boolean;
```

Serializes this JSON array into the supplied `StringBuilder`.

**Formatting:** Set `EmitCompact` to choose compact versus pretty output. When pretty output is enabled, `EmitCrlf` selects CRLF or LF line endings.

**Large JSON:** Using a `StringBuilder` can avoid returning a very large JSON document as a language-native string before passing it to another Chilkat method or writing it to a file.

Returns True for success, False for failure.

### JsonArray.FindObject

`Chilkat 11.7.0 · pascal · JsonArray · FindObject · method · since 9.5.0.73`

```pascal
function  FindObject(const name: string;
    const value: string;
    caseSensitive: Boolean): Integer;
```

Searches array elements that are JSON objects and returns the zero-based index of the first object whose direct member `name` has a value matching `value`. Returns `-1` if no match is found. The value pattern may contain `*`, which matches zero or more characters. Set `caseSensitive` to control whether letter case must match.

**Member name, not JSON path:** `name` identifies a direct member of each object being tested; it is not a JSON path.

**Search start:** Searching begins at `FindStartIndex`, whose default is `0`. To continue searching after a match, set `FindStartIndex` to the previous returned index plus 1.

### JsonArray.FindString

`Chilkat 11.7.0 · pascal · JsonArray · FindString · method · since 9.5.0.73`

```pascal
function  FindString(const value: string;
    caseSensitive: Boolean): Integer;
```

Searches for the first string array element matching `value` and returns its zero-based index, or `-1` if no match is found. The pattern may contain `*`, which matches zero or more characters. Set `caseSensitive` to control whether letter case must match.

**Search start:** Searching begins at `FindStartIndex`, whose default is `0`. To continue searching after a match, set `FindStartIndex` to the previous returned index plus 1.

### JsonArray.IntAt

`Chilkat 11.7.0 · pascal · JsonArray · IntAt · method · since 9.5.0.56`

```pascal
function  IntAt(index: Integer): Integer;
```

Returns the integer value stored at zero-based position `index`.

**Type-aware access:** Use `TypeAt` when the JSON type at `index` is not already known.

### JsonArray.IsNullAt

`Chilkat 11.7.0 · pascal · JsonArray · IsNullAt · method · since 9.5.0.56`

```pascal
function  IsNullAt(index: Integer): Boolean;
```

Returns `True` if the value at zero-based position `index` is the JSON value `null`; otherwise returns `False`.

**JSON null:** `null` is a distinct JSON value. It is not the same as an empty string, zero, `false`, an empty object, or an empty array.

### JsonArray.Load

`Chilkat 11.7.0 · pascal · JsonArray · Load · method · since 9.5.0.64`

```pascal
function  Load(const jsonArray: string): Boolean;
```

Parses the JSON array text in `jsonArray` and loads it into this object. The input must represent a JSON array, beginning with `[` and ending with `]`.

**Important — loading detaches the array:** Calling this method makes the `JsonArray` its own independent JSON document. If the object previously referenced an array nested inside another JSON document, that relationship is discarded. For this reason, call `Load`/`LoadSb` on a new `JsonArray` instance.

Returns True for success, False for failure.

### JsonArray.LoadSb

`Chilkat 11.7.0 · pascal · JsonArray · LoadSb · method · since 9.5.0.64`

```pascal
// sb is a TStringBuilder object.

function  LoadSb(sb: TChilkatBase): Boolean;
```

Parses the JSON array contained in `sb` and loads it into this object. The input must represent a JSON array, beginning with `[` and ending with `]`.

**Important — loading detaches the array:** Calling this method makes the `JsonArray` its own independent JSON document. If the object previously referenced an array nested inside another JSON document, that relationship is discarded. For this reason, call `Load`/`LoadSb` on a new `JsonArray` instance.

Returns True for success, False for failure.

### JsonArray.ObjectAt

`Chilkat 11.7.0 · pascal · JsonArray · ObjectAt · method · since 9.5.0.56`

```pascal
// Return value is a TJsonObject object.

function  ObjectAt(index: Integer): TChilkatBase;
```

Returns the JSON object stored at zero-based position `index`.

**Reference, not copy:** The returned `JsonObject` refers to the existing object in the same JSON document. Changes made through the returned object modify that nested object.

**Type requirement:** The value at `index` must be an object. Use `TypeAt` when the value type is not already known.

Returns `nil` on failure

### JsonArray.ObjectAt2

`Chilkat 11.7.0 · pascal · JsonArray · ObjectAt2 · method · since 11.0.0`

```pascal
// jsonObj is a TJsonObject object.

function  ObjectAt2(index: Integer;
    jsonObj: TChilkatBase): Boolean;
```

Updates `jsonObj` so that it references the JSON object stored at zero-based position `index`.

**Reference, not copy:** Changes made through `jsonObj` modify the existing object in the same JSON document.

Returns True for success, False for failure.

### JsonArray.SetBoolAt

`Chilkat 11.7.0 · pascal · JsonArray · SetBoolAt · method · since 9.5.0.56`

```pascal
function  SetBoolAt(index: Integer;
    value: Boolean): Boolean;
```

Replaces the value at zero-based position `index` with the specified JSON boolean value. The array length and the positions of other elements are unchanged.

Returns True for success, False for failure.

### JsonArray.SetIntAt

`Chilkat 11.7.0 · pascal · JsonArray · SetIntAt · method · since 9.5.0.56`

```pascal
function  SetIntAt(index: Integer;
    value: Integer): Boolean;
```

Replaces the value at zero-based position `index` with the specified JSON integer value. The array length and the positions of other elements are unchanged.

Returns True for success, False for failure.

### JsonArray.SetNullAt

`Chilkat 11.7.0 · pascal · JsonArray · SetNullAt · method · since 9.5.0.56`

```pascal
function  SetNullAt(index: Integer): Boolean;
```

Replaces the value at zero-based position `index` with the JSON value `null`. The array length and the positions of other elements are unchanged.

Returns True for success, False for failure.

### JsonArray.SetNumberAt

`Chilkat 11.7.0 · pascal · JsonArray · SetNumberAt · method · since 9.5.0.56`

```pascal
function  SetNumberAt(index: Integer;
    const value: string): Boolean;
```

Replaces the value at zero-based position `index` with a JSON number. The `value` argument supplies the exact JSON numeric text to store.

**Exact numeric text:** Use this method when lexical form or precision matters. The supplied text must be valid JSON number syntax; JSON does not permit `NaN` or infinity.

Returns True for success, False for failure.

### JsonArray.SetStringAt

`Chilkat 11.7.0 · pascal · JsonArray · SetStringAt · method · since 9.5.0.56`

```pascal
function  SetStringAt(index: Integer;
    const value: string): Boolean;
```

Replaces the value at zero-based position `index` with the specified JSON string value. The array length and the positions of other elements are unchanged.

Returns True for success, False for failure.

### JsonArray.SetUIntAt

`Chilkat 11.7.0 · pascal · JsonArray · SetUIntAt · method · since 9.5.0.96`

```pascal
function  SetUIntAt(index: Integer;
    value: LongWord): Boolean;
```

Replaces the value at zero-based position `index` with the specified JSON unsigned integer value. The array length and the positions of other elements are unchanged.

Returns True for success, False for failure.

### JsonArray.StringAt

`Chilkat 11.7.0 · pascal · JsonArray · StringAt · method · since 9.5.0.56`

```pascal
function  StringAt(index: Integer): string;
```

Returns the string value stored at zero-based position `index`.

**Type-aware access:** Use `TypeAt` when the JSON type at `index` is not already known.

Returns True for success, False for failure.

### JsonArray.Swap

`Chilkat 11.7.0 · pascal · JsonArray · Swap · method · since 9.5.0.76`

```pascal
function  Swap(index1: Integer;
    index2: Integer): Boolean;
```

Exchanges the values at zero-based positions `index1` and `index2`. The array length does not change.

Returns True for success, False for failure.

### JsonArray.TypeAt

`Chilkat 11.7.0 · pascal · JsonArray · TypeAt · method · since 9.5.0.58`

```pascal
function  TypeAt(index: Integer): Integer;
```

Returns an integer identifying the JSON type of the value at zero-based position `index`. Returns `-1` if no value exists at that index.

|  |  |
| --- | --- |
| `1` | string |
| `2` | number |
| `3` | object |
| `4` | array |
| `5` | boolean |
| `6` | null |

**Why use TypeAt:** JSON arrays may contain mixed types. Checking the type first avoids choosing a type-specific accessor such as `ObjectAt`, `ArrayAt`, or `IntAt` for the wrong kind of value.

### JsonArray.UIntAt

`Chilkat 11.7.0 · pascal · JsonArray · UIntAt · method · since 9.5.0.96`

```pascal
function  UIntAt(index: Integer): LongWord;
```

Returns the unsigned integer value stored at zero-based position `index`.

**Type-aware access:** Use `TypeAt` when the JSON type at `index` is not already known.

## Related classes

[`CkDateTime`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/pascal/classes/CkDateTime.md), [`DtObj`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/pascal/classes/DtObj.md), [`JsonObject`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/pascal/classes/JsonObject.md), [`StringBuilder`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/pascal/classes/StringBuilder.md)