[英]Can't extract JSON from API response - Google Cloud Vision API (Node.js library)
This is probably a simple JSON issue but I am struggling to extract data from the text detection response using the Google Vision API on Node.js这可能是一个简单的 JSON 问题,但我正在努力使用 Node.js 上的 Google Vision API 从文本检测响应中提取数据
The response I am getting looks like JSON data to me (here is a sample of the raw response as a string):我得到的响应对我来说看起来像 JSON 数据(这里是作为字符串的原始响应示例):
[{webDetection: null, logoAnnotations: [], context: null, safeSearchAnnotation: null,
fullTextAnnotation: {pages: [{blocks: [{blockType: TEXT, paragraphs: [{words: [{symbols:
[{boundingBox: {normalizedVertices: [], vertices: [{x: 568, y: 0}, {x: 601, y: 1}, {x:
600, y: 84}, {x: 567, y: 83}]}, property: {detectedBreak: null, detectedLanguages:
[{languageCode: en, confidence: 0}]}, confidence: 0.9900000095367432, text: B},
{boundingBox: {normalizedVertices: [], vertices: [{x: 615, y: 0}, {x: 640, y: 0}, {x: 639,
y: 83}, {x: 614, y: 83}]}, property: {detectedBreak: null, detectedLanguages:
[{languageCode: en, confidence: 0}]}, confidence: 1, text: a}, {boundingBox:
{normalized...
However when I try and parse it as follows, I am getting an error.但是,当我尝试按如下方式解析它时,出现错误。
const jsonData = response[0].fullTextAnnotation;
const textAnnotation = JSON.parse(jsonData);
Error: SyntaxError: Unexpected token o in JSON at position 1错误:SyntaxError:JSON 中位置 1 的意外标记 o
Any ideas what I am doing wrong and how I can extract the data correctly?任何想法我做错了什么以及如何正确提取数据?
Update更新
I've tried reading the data as arrays and maps which doesn't work with regular for loops, but does if I use an int loop eg我试过将数据作为数组和映射读取,这些数据不适用于常规 for 循环,但是如果我使用 int 循环,例如
Doesn't work:不起作用:
const fullTextAnnotation = response[0].fullTextAnnotation;
const pages = fullTextAnnotation.pages;
const allBlocks = [];
for (var page in pages) {
const blocks = page.blocks;
for (var block in blocks) {
allBlocks.push(block);
}
}
Does work:是否有效:
const fullTextAnnotation = response[0].fullTextAnnotation;
const pages = fullTextAnnotation.pages;
const allBlocks = [];
for (var i = 0; i<pages.length;i++) {
const blocks = pages[i].blocks;
for (var j = 0; j<blocks.length;j++) {
allBlocks.push(blocks[j]);
}
}
When I use the regular for loop I get an error: Property 'blocks' does not exist on type 'string'.当我使用常规 for 循环时,出现错误:“字符串”类型上不存在属性“块”。
When I use the int loop, the blocks property is properly shown as: const blocks: vision.protos.google.cloud.vision.v1.IBlock[]当我使用 int 循环时,blocks 属性正确显示为: const blocks: vision.protos.google.cloud.vision.v1.IBlock[]
This is something I can deal with I guess, however I am definitely curious what is going wrong, because it took a lot of guessing to find the workaround.我猜这是我可以处理的事情,但是我绝对很好奇出了什么问题,因为找到解决方法需要很多猜测。
It's hard to tell without the full string, and without the previous code, but it looks like you might be grabbing the fullTextAnnotation before you are parsing the string.如果没有完整的字符串和前面的代码,很难判断,但看起来您可能在解析字符串之前获取了 fullTextAnnotation。 I would suggest trying to parse response or response[0], and then assign fullTextAnnotation to the textAnnotation variable.
我建议尝试解析响应或响应 [0],然后将 fullTextAnnotation 分配给 textAnnotation 变量。
If you could share a console.log() of response, response[0], the respective JSON.parses() for those, and then possibly the unparse response[0].fullTextAnnotation, that would definitely help us diagnose the issue!如果您可以共享响应的 console.log()、响应 [0]、相应的 JSON.parses(),然后可能是未解析的响应 [0].fullTextAnnotation,那肯定会帮助我们诊断问题!
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